Honda FourTrax Rancher TRX420TM1 2019 Owner's Manual 270 Pages

2019
OWNER’S MANUAL
TRX420TM1
TRX420FM1 4X4
FOURTRAX RANCHER
Read this manual carefully,
it contains important safety information.
Minimum recommended operator age: 16
Models sold in and used in California:
The removal or modification of evaporative
emission-related parts on this OHRV is illegal. Violators
may be subject to civil and/or criminal penalties as
provided under California and federal law.
Part Number
19 TRX420TM1 FM1_31HR3650.book Page 1 Tuesday, April 3, 2018 11:37 AM
This manual should be considered a permanent part of the ATV and
should remain with the ATV when it is resold.
This Owner’s Manual covers the TRX420TM1 and TRX420FM1
models. You may find descriptions of equipment and features that
are not on your particular model. All illustrations are based on the
TRX420FM1 model.
This publication includes the latest production information available
before printing. Honda Motor Co., Ltd. reserves the right to make
changes at any time without notice and without incurring any
obligation.
No part of this publication may be reproduced without written
permission.
This vehicle pictured in this owner’s manual may not match your
actual vehicle.
© Honda Motor Co., Ltd. 2018
19 TRX420TM1 FM1_31HR3650.book Page 2 Tuesday, April 3, 2018 11:37 AM
2019
Honda
TRX420TM1
TRX420FM1 4x4
FOURTRAX RANCHER
OWNER’S MANUAL
FOR OFF-ROAD USE ONLY
This vehicle is designed and manufactured for off-road use only.
USA only:
It conforms to US EPA Noise Emission regulations, but does not
conform to Federal Motor Vehicle Safety Standards or US EPA On
Highway Exhaust Emission regulations, and operation on public
streets, roads, or highways is illegal. The vehicle is equipped with a
USDA qualified spark arrester. Obey local laws and regulations.
It conforms to US EPA and Environment Climate Change Canada
emission regulations for ATVs.
19 TRX420TM1 FM1_31HR3650.book Page 3 Tuesday, April 3, 2018 11:37 AM
Introduction
Congratulations on choosing your Honda ATV.
Introduction
When you own a Honda, you’re part of a worldwide family of
satisfied customers — people who appreciate Honda’s reputation
for building quality into every product.
Your Honda was designed as a recreational ATV for off-road use by
one rider only.
Before riding, take time to get acquainted with your ATV and how it
works. To protect your investment, we urge you to take
responsibility for keeping your ATV well maintained. Scheduled
service is a must, of course. But it’s just as important to observe the
break-in guidelines, and perform all pre-ride and other periodic
checks detailed in this manual.
We also recommend that you read this owner’s manual before you
ride. It’s full of facts, instructions, safety information, and helpful
tips. To make it easy to use, the manual contains a detailed list of
topics at the beginning of each section and an index at the back of
the book.
As you read this manual, you will find information that is preceded
by a NOTICE symbol. This information is intended to help you avoid
damage to your Honda, other property, or the environment.
Read the Warranties Booklet (page 239) thoroughly so you
understand the coverages that protect your new Honda and are
aware of your rights and responsibilities.
Whenever you ride, tread lightly. By staying on established trails and
riding only in approved areas, you help protect the environment and
keep off-road riding areas open for the future.
Introduction
19 TRX420TM1 FM1_31HR3650.book Page 4 Tuesday, April 3, 2018 11:37 AM
Introduction
If you have any questions, or if you ever need special service or
repairs, remember that your dealer knows your ATV best and is
dedicated to your complete satisfaction.
Please report any change of address or ownership to your dealer so
we will be able to contact you concerning important product
information.
You may also want to visit our website at
USA: www.powersports.honda.com.
Canada: www.honda.ca.
Happy riding!
Introduction
19 TRX420TM1 FM1_31HR3650.book Page 5 Tuesday, April 3, 2018 11:37 AM
A Few Words About Safety
Your safety, and the safety of others, is very important. And
operating this ATV safely is an important responsibility.
A Few Words About Safety
To help you make informed decisions about safety, we have
provided operating procedures and other information on labels and
in this manual. This information alerts you to potential hazards that
could hurt you or others.
Of course, it is not practical or possible to warn you about all hazards
associated with operating or maintaining an ATV. You must use your
own good judgment.
You will find important safety information in a variety of forms,
including:
Safety Labels — on the ATV.
Safety Messages — preceded by a safety alert symbol 2 and one
of three signal words: DANGER, WARNING, or CAUTION.
A Few Words About Safety
19 TRX420TM1 FM1_31HR3650.book Page 6 Tuesday, April 3, 2018 11:37 AM
A Few Words About Safety
These signal words mean:
3 DANGER
You WILL be KILLED or
SERIOUSLY HURT if you don‘t
follow instructions.
3 WARNING
You CAN be KILLED or SERIOUSLY
HURT if you don’t follow
instructions.
3 CAUTION
You CAN be HURT if you don’t
follow instructions.
Safety Headings — such as Important Safety Reminders or
Important Safety Precautions.
Safety Section — such as ATV Safety.
Instructions — how to use this ATV correctly and safely.
This entire manual is filled with important safety information —
please read it carefully.
A Few Words About Safety
19 TRX420TM1 FM1_31HR3650.book Page 7 Tuesday, April 3, 2018 11:37 AM
Contents
These pages give an overview of the contents of your owner’s
manual.
The first page of each section lists the topics covered in that section.
Contents
ATV Safety ..................................................................................1
Important safety information you should know, plus a look at the
safety related labels on your ATV.
Instruments & Controls ..............................................................9
The location and function of indicators and controls on your ATV
and operating instructions for various controls and features.
Before Riding ............................................................................47
The importance of wearing a helmet and other protective gear,
how to make sure you and your ATV are ready to ride, and
important information about loading.
Basic Operation & Riding .........................................................63
How to start and stop the engine, shift gears, and brake. Also,
riding precautions.
Contents
19 TRX420TM1 FM1_31HR3650.book Page 8 Tuesday, April 3, 2018 11:37 AM
Contents
Servicing Your Honda ..............................................................97
Why your ATV needs regular maintenance, what you need to
know before servicing your Honda, an owner maintenance
schedule, and instructions for specific maintenance and
adjustment items.
Tips ..........................................................................................191
How to store and transport your ATV and how to be an
environmentally responsible rider.
Taking Care of the Unexpected .............................................201
What to do if you have a flat tire, your engine won’t start, etc.
Technical Information ............................................................221
ID numbers, technical specifications, and other technical facts.
Consumer Information ...........................................................237
Information on warranties, emission controls, how to get Honda
service manuals.
Index ........................................................................................244
Quick Reference
Handy facts about fuel, engine oil, tire sizes, and air pressures.
Contents
19 TRX420TM1 FM1_31HR3650.book Page 9 Tuesday, April 3, 2018 11:37 AM
19 TRX420TM1 FM1_31HR3650.book Page 1 Tuesday, April 3, 2018 11:37 AM
ATV Safety
This section presents some of the most important information and
recommendations to help you ride your ATV safely. Please take a few
moments to read these pages. This section also includes information
about the location of safety labels on your ATV.
ATV Safety
Important Safety Information........................................................ 2
Safety Labels ................................................................................ 5
ATV Safety
1
19 TRX420TM1 FM1_31HR3650.book Page 2 Tuesday, April 3, 2018 11:37 AM
Important Safety Information
Your ATV can provide many years of service and pleasure if you take
responsibility for your own safety and understand the challenges you
can meet while riding.
There is much that you can do to protect yourself when you ride.
You’ll find many helpful recommendations throughout this manual.
The following are a few that we consider to be most important.
Follow the Age Recommendation
The minimum recommended age for this ATV model is 16. Children
under age 16 should never operate this vehicle. Refer to the age
warnings provided in this manual and on the ATV.
Always Wear a Helmet
It’s a proven fact: helmets significantly reduce the number and
severity of head injuries. So always wear an approved motorcycle
helmet. We also recommend that you wear eye protection, sturdy
boots, gloves, and other protective gear (page 48).
Never Carry a Passenger
Your ATV is designed for one person only. There are no handholds,
footrests, or seat for a second person, so never carry a passenger. A
passenger could interfere with your ability to move around to
maintain your balance and control of the ATV.
2
ATV Safety
19 TRX420TM1 FM1_31HR3650.book Page 3 Tuesday, April 3, 2018 11:37 AM
Important Safety Information
Ride Off-road Only
Your ATV is designed and manufactured for off-road use only. The
tires are not made for pavement, and the ATV does not have turn
signals and other features required for use on public roads. If you
need to cross a paved or public road, get off and walk your ATV
across.
Take Time to Learn & Practice
Even if you have ridden other ATVs, take time to become familiar
with how this ATV works and handles. Practice in a safe area until
you build your skills and get accustomed to the ATV’s size and
weight.
Because many crashes involve inexperienced or untrained riders, we
urge all riders to take a ATV operator course approved by the ATV
Safety Institute (ASI). See page 50.
Contact an authorized ATV dealer or call 1-800-887-2887 (USA
only) to find out about the training courses nearest you.
Be Alert for Off-road Hazards
The terrain can present a variety of challenges when you ride offroad. Continually “read” the terrain for unexpected turns, drop-offs,
rocks, ruts, and other hazards. Always keep your speed low enough
to allow time to see and react to hazards.
ATV Safety
3
19 TRX420TM1 FM1_31HR3650.book Page 4 Tuesday, April 3, 2018 11:37 AM
Important Safety Information
Ride within Your Limits
Pushing limits is another major cause of ATV crashes. Never ride
beyond your personal abilities or faster than conditions warrant.
Remember that alcohol, drugs, fatigue, and inattention can
significantly reduce your ability to make good judgments and ride
safely.
Don’t Drink and Ride
Alcohol and riding don’t mix. Even one drink can reduce your ability
to respond to changing conditions, and your reaction time gets
worse with every additional drink. So don’t drink and ride, and don’t
let your friends drink and ride either.
Keep Your Honda in Safe Condition
It’s important to keep your ATV properly maintained and in safe
riding condition. Having a breakdown can be difficult, especially if
you are stranded off-road far from your base. To help avoid
problems, inspect your ATV before every ride and perform all
recommended maintenance.
4
ATV Safety
19 TRX420TM1 FM1_31HR3650.book Page 5 Tuesday, April 3, 2018 11:37 AM
Safety Labels
Your ATV comes with a hang tag and several labels containing
important safety information. Anyone who rides the vehicle should
read and understand this information before riding.
The labels should be considered permanent parts of the vehicle. If a
label comes off or becomes hard to read, contact your dealer for
replacements.
ATV Safety
5
19 TRX420TM1 FM1_31HR3650.book Page 6 Tuesday, April 3, 2018 11:37 AM
Safety Labels
WARNING
Improper ATV use can result in SEVERE INJURY or DEATH
ALWAYS USE
AN APPROVED
HELMET AND
PROTECTIVE
GEAR
NEVER USE
ON PUBLIC
ROADS
NEVER CARRY NEVER USE
PASSENGERS WITH DRUGS
OR ALCOHOL
NEVER operate:
without proper training or instruction
at speeds too fast for your skills or the conditions
on public roads - a collision can occur with
another vehicle
with a passenger - passengers affect balance
and steering and increase risk of losing control
ALWAYS:
use proper riding techniques to avoid vehicle
overturns on hills and rough terrain and in turns
avoid paved surfaces - pavement may seriously
affect handling and control
LOCATE AND READ OWNER'S MANUAL.
FOLLOW ALL INSTRUCTIONS AND WARNINGS.
6
ATV Safety
19 TRX420TM1 FM1_31HR3650.book Page 7 Tuesday, April 3, 2018 11:37 AM
Safety Labels
WARNING
Overloading this ATV or carrying cargo
improperly can change handling,stability
and braking performance and can lead to an
accident.
Never exceed the maximum front cargo limit
of : 66 lbs (30 kg).
Refer to instructions in the Owner’s
Manual.
Improper tire pressure or overloading can
cause loss of control.
Loss of control can result in severe injury
or death.
Cold tire pressure :
Front : 4.4psi
(30kPa)
Rear : 4.4psi
(30kPa)
Maximum weight capacity : 485lbs. (220kg)
ATV Safety
7
19 TRX420TM1 FM1_31HR3650.book Page 8 Tuesday, April 3, 2018 11:37 AM
Safety Labels
(For Canada)
Operating this ATV if you are under
the age of 16 increases your chance
of severe injury or death.
NEVER operate this ATV if you are
under age 16.
(Except TRX420TM1)
BRAKING INFORMATION
With four-wheel drive, operating any brake control
causes braking at both the front and rear wheels.
For detailed braking information, refer to the
Owner's Manual.
WARNING
Improper ATV use can result in SEVERE INJURY or DEATH
WARNING
ALWAYS USE NEVER USE NEVER CARRY NEVER USE
AN APPROVED ON PUBLIC PASSENGERS WITH DRUGS
OR ALCOHOL
ROADS
HELMET AND
PROTECTIVE
GEAR
NEVER operate:
without proper training or instruction
at speeds too fast for your skills or the conditions
on public roads - a collision can occur with
another vehicle
with a passenger - passengers affect balance
and steering and increase risk of losing control
Overloading this ATV or carrying cargo
improperly can change handling,stability
and braking performance and can lead to an
accident.
Never exceed the maximum rear cargo limit
(combined weight on the rear rack and in
the storage area) of : 133 lbs (60 kg).
Refer to instructions in the Owner’s
Manual.
ALWAYS:
use proper riding techniques to avoid vehicle
overturns on hills and rough terrain and in turns
avoid paved surfaces - pavement may seriously
affect handling and control
LOCATE AND READ OWNER'S MANUAL.
FOLLOW ALL INSTRUCTIONS AND WARNINGS.
Towing an improperly loaded
trailer can cause loss of control.
Read towing instructions
in owner's manual
Tow weight limit : 850lbs. (385kg)
Tongue weight : 30lbs. ( 14kg)
8
ATV Safety
NEVER ride as a passenger.
Passengers can cause a loss
of control, resulting in
SEVERE INJURY or DEATH.
19 TRX420TM1 FM1_31HR3650.book Page 9 Tuesday, April 3, 2018 11:37 AM
Instruments & Controls
This section shows the location of all indicators and controls you
would normally use before or while riding your ATV.
Instruments & Controls
The items listed on this page are described in this section.
Instructions for other components are presented in other sections of
this manual where they will be most useful.
Operation Component Locations ................................................ 11
Indicators & Displays ................................................................... 14
Multi-function Display.............................................................. 20
Speed and Mileage Unit Changing........................................... 23
4WD Indicator ......................................................................... 23
Gear Position Indicator............................................................. 24
Fuel Gauge .............................................................................. 25
Digital Clock ............................................................................ 27
Odometer................................................................................ 28
Tripmeter................................................................................. 28
Coolant Temperature Gauge ................................................... 29
Hour meter.............................................................................. 31
Maintenance Tripmeter & Maintenance Hour meter................. 32
(cont’d)
Instruments & Controls
9
19 TRX420TM1 FM1_31HR3650.book Page 10 Tuesday, April 3, 2018 11:37 AM
Instruments & Controls
Controls & Features .................................................................... 34
Ignition Switch......................................................................... 34
2WD/4WD Select Lever............................................................ 35
Start Button............................................................................. 36
Engine Stop Switch.................................................................. 36
Headlight Switch ..................................................................... 37
Headlight Dimmer Switch ........................................................ 37
Recoil Starter (Canada only) ..................................................... 38
Throttle Lever .......................................................................... 39
Front Brake Lever..................................................................... 40
Rear Brake Lever/Parking Brake Lever ....................................... 40
Rear Brake Pedal...................................................................... 40
Parking Brake/Reverse Lever (P/R Lever) .................................... 41
Flag Pole Bracket ..................................................................... 43
Trailer Hitch ............................................................................. 44
Utility Pocket (TRX420TM1 only) .............................................. 45
Storage Compartment ............................................................. 46
10 Instruments & Controls
19 TRX420TM1 FM1_31HR3650.book Page 11 Tuesday, April 3, 2018 11:37 AM
Operation Component Locations
rear brake lever/
parking brake lever
front brake lever
P/R lever
headlight switch
engine stop
switch
start button
headlight dimmer
switch
throttle lever
ignition switch
2WD/4WD select lever
(Except TRX420TM1)
Instruments & Controls
11
19 TRX420TM1 FM1_31HR3650.book Page 12 Tuesday, April 3, 2018 11:37 AM
Operation Component Locations
rear cargo rack
front cargo rack
recoil starter
(Canada only)
12 Instruments & Controls
rear brake pedal
19 TRX420TM1 FM1_31HR3650.book Page 13 Tuesday, April 3, 2018 11:37 AM
Operation Component Locations
utility pocket
(TRX420TM1 only)
flag pole bracket
trailer hitch
storage compartment
Instruments & Controls
13
19 TRX420TM1 FM1_31HR3650.book Page 14 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
The indicators and displays on your ATV keep you informed, alert
you to possible problems, and make your riding safer and more
enjoyable. Refer to the indicators frequently. Their functions are
described on the following pages.
(TRX420FM1)
(TRX420TM1)
(3)
(2)
(1)
(4)
(7)
(6)
(1) neutral indicator
(2) reverse indicator
(3) PGM-FI indicator
(4) high coolant temperature
indicator
14 Instruments & Controls
(1)
(5)
(2)
(3)
(4)
(5) fuel warning indicator
(TRX420TM1 only)
(6) multi-function display
(Except TRX420TM1)
(7) mode button
(Except TRX420TM1)
19 TRX420TM1 FM1_31HR3650.book Page 15 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
Lamp Check
Initial lamp check:
The indicators come on for a few seconds and then go off when you
turn the ignition switch to ON (q).
Except TRX420TM1:
The high coolant temperature indicator and PGM-FI indicator will
temporarily come back on for a few seconds and then go off after
initial lamp check.
These indicators are identified in the table on page 17 with the
words: Lamp Check.
When applicable, the reverse or neutral indicators come back on and
remain on until you shift out of reverse or neutral after initial lamp
check.
TRX420FM1:
If one of these indicators does not come on when it should, have
your dealer check for problems.
TRX420TM1:
If one of these indicators does not come on when it should, have
your dealer check for burned-out bulbs or other problems.
Instruments & Controls
15
19 TRX420TM1 FM1_31HR3650.book Page 16 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
Display Check
Except TRX420TM1:
When the ignition switch is turned on, the multi-function display (1)
will temporarily show all the modes and digital segments and initial
message. So you can make sure the liquid crystal display is
functioning properly.
The displays are identified in the table on page 18 with the words:
Display Check.
If any part of these displays does not come on when it should, have
your dealer check for problems.
(1)
(1) multi-function display
16 Instruments & Controls
19 TRX420TM1 FM1_31HR3650.book Page 17 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
1
Neutral indicator
2
Reverse indicator
3
PGM-FI indicator
4
High coolant
temperature
indicator
5
fuel warning
indicator
(TRX420TM1 only)
Lights when the transmission is in
neutral. Lamp Check.
Lights when the transmission is in
reverse. Lamp Check.
Lights when there is any
abnormality in the PGM-FI
(Programmed Fuel Injection)
system. Should also light for a few
seconds and then go off when the
ignition switch is turned on. If the
indicator comes on at any other
time, reduce speed and take your
vehicle to your dealer as soon as
possible. Lamp Check.
Lights when coolant temperature is
high enough to adversely affect the
service life of the engine.
If the high coolant temperature
indicator comes on while you are
riding, immediately bring the
vehicle to a stop, turn the engine
off and let it cool. See page 211.
Lamp Check.
Lights when there is only reserve
fuel left in the fuel tank. The
amount of fuel remaining
approximately:
1.29 US gal (4.9 ℓ)
You should refill the tank as soon as
possible. See page 118.
Instruments & Controls
17
19 TRX420TM1 FM1_31HR3650.book Page 18 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
6
Multi-function
display (Except
TRX420TM1)
4WD indicator
Gear position
indicator
Speedometer
Fuel gauge
Digital clock
Odometer
Tripmeter
Coolant
temperature gauge
Hour meter
Maintenance
minder indicator
Maintenance
tripmeter
Maintenance hour
meter
18 Instruments & Controls
The display includes the following
functions. Display Check.
Shows when the 4WD drive mode
engages (page 23).
Shows the gear position (page 24).
Shows riding speed.
Shows approximate fuel supply
available (page 25).
Shows the time (hours and minutes)
(page 27).
Shows accumulated mileage (page
28).
Shows mileage per trip (page 28).
Shows approximate coolant
temperature (page 29).
Shows hours and tenths of hours of
engine operation (page 31).
Shows when specified maintenance
interval is reached (page 32).
Inform when the mileage or
operating hours on your ATV
approaches and passes the interval
specified on the maintenance
schedule (page 32).
19 TRX420TM1 FM1_31HR3650.book Page 19 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
7
Mode button
(Except
TRX420TM1)
Selects display in the lower parts of
multi-function display (page 21).
This button also used to change the
speed and mileage unit (page 23),
adjusts the clock (page 27) and
resets tripmeter, maintenance
tripmeter and maintenance hour
meter (page 32).
Instruments & Controls
19
19 TRX420TM1 FM1_31HR3650.book Page 20 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
Multi-function Display
The multi-function display (1) includes the following functions:
4WD indicator
Digital clock
Gear position indicator
Odometer
Maintenance minder
Tripmeter
Coolant temperature gauge
indicator
Speedometer
Hour meter
Fuel gauge
Maintenance tripmeter
Maintenance hour meter
(3)
(4)
(5)
(2)
(1)
(6)
(1) multi-function display (5) maintenance minder
(2) 4WD indicator
indicator
(3) gear position indicator (6) fuel gauge/digital clock/
odometer/tripmeter/coolant
(4) speedometer
temperature gauge/hour
meter/maintenance
tripmeter/maintenance hour
meter
20 Instruments & Controls
19 TRX420TM1 FM1_31HR3650.book Page 21 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
Each time you press the mode button, mode will change as shown in
the illustration.
Fuel gauge (page 25)
Digital clock (page 27)
Hour meter (page 31)
Odometer (page 28)
Tripmeter (page 28)
Maintenance
tripmeter (page 32)
Coolant temperature
gauge (page 29)
Maintenance hour
meter (page 32)
When ATV
is moving
When ATV
is not
moving
Instruments & Controls
21
19 TRX420TM1 FM1_31HR3650.book Page 22 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
If there is a fuel warning with your ATV, the display will automatically
change to the fuel gauge.
If you try to change the display back to ordinary display, it will
automatically return to the fuel gauge.
If there is a coolant temperature warning with your ATV, the display
will automatically change to the coolant temperature gauge. If you
try to change the display back to ordinary display, it will
automatically return to the coolant temperature gauge.
22 Instruments & Controls
19 TRX420TM1 FM1_31HR3650.book Page 23 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
Speed and Mileage Unit Changing
The speedometer, odometer, tripmeter and maintenance tripmeter
show in either “MPH” and “MILE” or “KM/H” and “KM”.
To change the speed and mileage unit, press and hold the mode
button (1) for more than 5 seconds in odometer (page 28) with the
ATV stopped.
(1)
(1) mode button
4WD Indicator
The 4WD indicator (1) appears when the 4WD mode engages (page
35).
(1)
(1) 4WD indicator
Instruments & Controls
23
19 TRX420TM1 FM1_31HR3650.book Page 24 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
Gear Position Indicator
The gear position indicator (1) shows the gear position when the
ignition switch is in the ON (q) position.
The indicator displays: N for neutral, R for reverse, and 1 – 5 for the
five forward gears.
“–” will be displayed on the gear position indicator when the
transmission is not shifted into gear properly. Before riding, check
that the gear position is properly displayed on the gear position
indicator.
If the gear position indicator shows “–” or blinks, turn the ignition
switch to the OFF (w) position, and then turn it back to the ON (q)
position again. If the gear position indicator shows “–”, rock the
vehicle back and forth and make sure the gear position indicator is
displayed properly and then if the gear position indicator still shows
“–” or blinks, see your dealer.
If the “–” on the gear position indicator is blinking, see your dealer.
(1)
(1) gear position indicator
24 Instruments & Controls
19 TRX420TM1 FM1_31HR3650.book Page 25 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
Fuel Gauge
The fuel gauge (1) shows the approximate fuel supply available with
fuel mark (2). The fuel tank capacity is:
3.88 US gal (14.7 ℓ)
(2)
(1)
(2) fuel mark
(1) fuel gauge
Regardless of what mode the display is in, when the fuel level
reaches only 1st segment (3), the display will automatically switch to
the fuel gauge display. You should refuel as soon as possible.
The amount of fuel remaining when there is only 1st segment is
approximately:
1.82 US gal (6.9 ℓ)
(3)
(3) 1st segment
Instruments & Controls
25
19 TRX420TM1 FM1_31HR3650.book Page 26 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
When the fuel gauge show E _ _ _ _ _ F (4) and LO FUEL (5) blink 3
times alternately and fuel mark blinks, you should refill the tank as
soon as possible.
The amount of fuel reserve is approximately:
1.29 US gal (4.9 ℓ)
(4)
(5)
(4) E _ _ _ _ _ F
(5) LO FUEL
Fuel gauge failure:
If the fuel gauge function fails, E - - - - - F (6) will blink.
See your dealer.
(The fuel mark disappears except the fuel gauge display)
(6)
(6) E - - - - - F
26 Instruments & Controls
19 TRX420TM1 FM1_31HR3650.book Page 27 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
Digital Clock
The digital clock (1) displays hours and minutes with the clock mark
(2), when the ignition switch is ON (q).
To adjust the time, proceed as follows:
1. Turn the ignition switch ON (1) to display the clock (page 21).
2. Press and hold the mode button (3) until the display start
blinking.
3. To advance the display 1 minute at a time, press and release the
mode button for 0.5 seconds.
Press and hold the mode button for more 0.5 seconds the display
will begin advancing fast.
4. Release the mode button when the display reaches the desired
time.
5. To set the clock, press and release the mode button for less than
0.5 seconds.
The clock can be set by turning the ignition switch off and then
on.
(2)
(3)
(1) digital clock
(2) clock mark
(1)
(3) mode button
After the battery is reconnected (page 183), check the clock.
Readjust the clock if necessary.
Instruments & Controls
27
19 TRX420TM1 FM1_31HR3650.book Page 28 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
Odometer
The odometer (1) registers total distance traveled in mileage while
the ignition is ON (q) with the ODO display (2). The odometer locks
at 999999 when the read-out exceeds 999999.
(2)
(1)
(1) odometer
(2) ODO display
Tripmeter
The tripmeter (1) shows mileage per trip with the TRIP display (2),
while the ignition is ON (q) since you last reset the tripmeter. The
tripmeter returns to 0.0 when the read-out exceeds 999.9. To reset
the tripmeter to zero, press the mode button (3) and hold it in for at
least 2 seconds in the tripmeter mode.
(2)
(1)
(3)
(1) tripmeter
(2) TRIP display
28 Instruments & Controls
(3) mode button
19 TRX420TM1 FM1_31HR3650.book Page 29 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
Coolant Temperature Gauge
The coolant temperature gauge (1) with the coolant temperature
mark (2) shows the coolant temperature.
When coolant temperature is low, the coolant temperature gauge
will display “Lo”.
(3)
(1)
(1) coolant temperature gauge
(2) coolant temperature mark
(2)
(3) high coolant
temperature indicator
If all sections of the coolant temperature gauge and high coolant
temperature indicator are on (automatically appears in the display)
while you are riding, immediately stop the vehicle, turn the engine
off and check the coolant reserve tank level. See page 135.
Instruments & Controls
29
19 TRX420TM1 FM1_31HR3650.book Page 30 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
NOTICE
Continuing to ride with an overheated engine can cause serious
engine damage.
Coolant temperature gauge failure:
If the coolant temperature system has an error, the coolant
temperature gauge (1) will flash and preferentially appear in the
display, and/or high coolant temperature indicator (3) will turn on.
If this occurs, see your dealer as soon as possible.
(3)
(1)
(1) coolant temperature gauge
30 Instruments & Controls
(3) high coolant
temperature indicator
19 TRX420TM1 FM1_31HR3650.book Page 31 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
Hour meter
The hour meter (1) shows accumulated hours while the ignition
switch is ON ( I ) with the hour meter mark (2). The hour meter
provides accurate service period information for initial and regular
maintenance. The hour meter locks at 99999.9 when the read-out
exceeds 99999.9.
(2)
(1)
(1) hour meter
(2) hour meter mark
Instruments & Controls
31
19 TRX420TM1 FM1_31HR3650.book Page 32 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
Maintenance Tripmeter & Maintenance Hour
meter
The maintenance tripmeter (1), the maintenance hour meter (2) and
maintenance minder indicator (3) inform you when the mileage or
operating hours on your ATV approaches and passes the
maintenance interval specified on the maintenance schedule (page
104).
(3)
(3)
(2)
(1)
(1) maintenance tripmeter
(2) maintenance hour meter
(3) maintenance minder
indicator
The maintenance tripmeter, or the maintenance hour meter and
maintenance minder indicator will blink, when they reach their
setting values.
(3)
(3)
(1)
(2)
32 Instruments & Controls
19 TRX420TM1 FM1_31HR3650.book Page 33 Tuesday, April 3, 2018 11:37 AM
Indicators & Displays
Reset the meters after each scheduled maintenance.
To reset the maintenance tripmeter and the maintenance hour
meter, press and hold the mode button and turn the ignition switch
to ON ( I ). Continue to hold the mode button, the maintenance
minder indicator will light up, and after 2 seconds will flash twice,
the maintenance minder indicator is reset.
Also the maintenance tripmeter and maintenance hour meter will
reset.
Maintenance Minder Indicators:
Initial Maintenance
Appears at 100 miles (150 km) or 20 operating hours,
whichever comes first.
Regular Maintenance Interval 1
Appears 600 miles (1,000 km) or 100 operating hours
after the Initial Maintenance or Regular Maintenance
Interval 2 is performed and maintenance minder is
reset, whichever comes first in the maintenance
schedule.
Regular Maintenance Interval 2
Appears 600 miles (1,000 km) or 100 operating hours
after Regular Maintenance Interval 1 is performed and
maintenance minder is reset, whichever comes first in
the maintenance schedule.
If the maintenance is done before the setting interval, be sure to
reset the meters after the maintenance.
Instruments & Controls
33
19 TRX420TM1 FM1_31HR3650.book Page 34 Tuesday, April 3, 2018 11:37 AM
Controls & Features
Ignition Switch
The ignition switch (1) is used for starting and stopping the engine
(page 70). Insert the key and turn it to the right for the ON (q)
position.
Except TRX420TM1:
The ignition switch is also used to reset the maintenance tripmeter
and the maintenance hour meter (page 33).
Key Position
ON (q)
OFF (w)
Function
Electrical circuits on.
No electrical circuits function.
CENTER OF HANDLEBAR
OFF
ON
(1)
(1) ignition switch
34 Instruments & Controls
q ON
w OFF
19 TRX420TM1 FM1_31HR3650.book Page 35 Tuesday, April 3, 2018 11:37 AM
Controls & Features
2WD/4WD Select Lever
Your ATV is equipped with a 2WD/4WD select lever (1), which
permits a choice between the “2WD” and “4WD” drive modes.
Select a drive mode that’s suitable for your riding.
Keep both hands on the handlebar while machine is in motion and
come to a complete stop before using the 2WD/4WD select lever.
The 2WD/4WD select lever is located on the left side of the fuel tank.
To select the drive mode, shift the 2WD/4WD select lever to the
desired position.
After using the 2WD/4WD select lever, the mode may not
mechanically engage until forward motion begins.
To check your present drive mode, look at the 4WD indicator (2).
2WD mode: the 4WD indicator goes off when the 2WD mode engages.
4WD mode: the 4WD indicator goes on when the 4WD mode engages.
4WD MODE
4WD MODE
(2)
(1)
2WD MODE
(1) 2WD/4WD select lever
2WD MODE
(2) 4WD indicator
Instruments & Controls
35
19 TRX420TM1 FM1_31HR3650.book Page 36 Tuesday, April 3, 2018 11:37 AM
Controls & Features
o
Start Button
LEFT HANDLEBAR
(2)
(1)
(1) start button
o START
(2) engine stop switch
r OFF
e RUN
The start button (1) is used for starting the engine. Pushing the
button in starts the engine. See Starting Procedure, page 72.
When the start button is pushed, the starter motor will crank the
engine. The starter motor will not operate if the engine stop switch
is in the OFF (r) position when the start button is pushed.
Engine Stop Switch
e
r
The engine stop switch (2) is used to stop the engine in an
emergency. To operate, slide the switch to the OFF (r) position. The
switch must be in the RUN (e) position to start the engine, and it
should normally remain in the RUN (e) position even when the
engine is OFF.
If your ATV is stopped with the ignition switch ON (q) and the engine
stop switch OFF (r), the battery will discharge. Turn the ignition
switch to OFF (w) to prevent battery discharge.
36 Instruments & Controls
19 TRX420TM1 FM1_31HR3650.book Page 37 Tuesday, April 3, 2018 11:37 AM
Controls & Features
y
Headlight Switch
t
LEFT HANDLEBAR
(1)
(2)
(1) headlight switch
y ON
(2) headlight dimmer switch
t OFF
u HI
i LO
The headlight switch (1) is used to turn the headlights ON (y) or OFF
(t). To operate, turn the switch to ON (y) or OFF (t).
Headlight Dimmer Switch
u i
The headlight dimmer switch (2) is used to change between the high
and low beams of the headlight. To operate, turn the switch to HI
(u) for high beam, LO (i) for low beam.
Instruments & Controls
37
19 TRX420TM1 FM1_31HR3650.book Page 38 Tuesday, April 3, 2018 11:37 AM
Controls & Features
Recoil Starter (Canada only)
RIGHT SIDE
(1)
(1) recoil starter
The recoil starter (1) is used to start the engine when the battery is
low. See Using the Recoil Starter (Canada only), page 76.
38 Instruments & Controls
19 TRX420TM1 FM1_31HR3650.book Page 39 Tuesday, April 3, 2018 11:37 AM
Controls & Features
Throttle Lever
RIGHT HANDLEBAR
(A)
(1)
(1) throttle lever
(A) to open the throttle
The throttle controls engine rpm (speed). To increase engine rpm,
press the throttle lever (1) with your thumb. To reduce engine rpm,
release pressure on the throttle lever. The throttle will automatically
return to the closed position (engine idle) when you remove your
thumb.
Instruments & Controls
39
19 TRX420TM1 FM1_31HR3650.book Page 40 Tuesday, April 3, 2018 11:37 AM
Controls & Features
Front Brake Lever
The front brake lever is used to slow or stop your ATV. To operate,
pull the lever. For information on braking techniques, see page 81.
Rear Brake Lever/Parking Brake Lever
The rear brake lever/parking brake lever is used to slow or stop your
ATV. To operate, pull the lever. For information on braking
techniques, see page 81.
Rear Brake Pedal
The rear brake pedal is used to slow or stop your ATV. To operate,
depress the pedal. For information on braking techniques, see
page 81.
40 Instruments & Controls
19 TRX420TM1 FM1_31HR3650.book Page 41 Tuesday, April 3, 2018 11:37 AM
Controls & Features
Parking Brake/Reverse Lever (P/R Lever)
LEFT HANDLEBAR
(1)
(2)
(1) P/R lever
(2) rear brake lever/parking brake lever
The P/R lever (1) on the rear brake lever/parking brake lever (2) is
used to apply the parking brake or to shift the transmission into
reverse.
To apply the parking brake:
Bring the vehicle to a complete stop, make sure the transmission is in
neutral.
Squeeze the rear brake lever/parking brake lever (2), then rotate the
P/R lever (1) clockwise until it engages the slot on the rear brake
lever/parking brake lever bracket.
For more information on Parking, see page 96.
(A)
(A) to apply the parking brake
(cont’d)
Instruments & Controls
41
19 TRX420TM1 FM1_31HR3650.book Page 42 Tuesday, April 3, 2018 11:37 AM
Controls & Features
To release the parking brake:
Squeeze the rear brake lever/parking brake lever until the P/R lever is
released from the slot on the rear brake lever/parking brake lever
bracket.
The brake light is activated by applying the brake. When using the
parking brake, be sure to turn the ignition switch to OFF (w) to avoid
discharging the battery.
To shift the transmission into reverse:
For information on Riding in Reverse, see page 79.
42 Instruments & Controls
19 TRX420TM1 FM1_31HR3650.book Page 43 Tuesday, April 3, 2018 11:37 AM
Controls & Features
Flag Pole Bracket
RIGHT REAR
(1)
(1) flag pole bracket
Flag poles are optional equipment available from your dealer. To
mount a pole in the bracket (1), follow the instructions that come
with the flag pole kit.
Flag poles are required in some riding areas. Check local regulations
before riding.
Instruments & Controls
43
19 TRX420TM1 FM1_31HR3650.book Page 44 Tuesday, April 3, 2018 11:37 AM
Controls & Features
Trailer Hitch
REAR
(2)
(1)
(1) trailer hitch
(2) ball
The trailer hitch (1) is located on the rear axle housing. To use the
hitch, you’ll need a proper size ball (2) as specified by the trailer
manufacturer.
To attach the ball and properly hook up a trailer, follow the trailer
manufacturer’s instructions. For load limits and operational
guidelines, see page 57.
44 Instruments & Controls
19 TRX420TM1 FM1_31HR3650.book Page 45 Tuesday, April 3, 2018 11:37 AM
Controls & Features
Utility Pocket (TRX420TM1 only)
The utility pocket (1) is located on the left side cover. You may store
small, lightweight items in the pocket.
NOTICE
Do not store valuable items in the utility pocket.
LEFT SIDE COVER
(1)
(1) utility pocket
Instruments & Controls
45
19 TRX420TM1 FM1_31HR3650.book Page 46 Tuesday, April 3, 2018 11:37 AM
Controls & Features
Storage Compartment
The storage compartment (1) is located below the rear cargo rack
(2).
To open the compartment, unhook the rubber strap (3).
Be careful not to flood this area when washing your ATV.
REAR
(2)
(3)
(1)
(1) storage compartment
(2) rear cargo rack
(3) rubber strap
46 Instruments & Controls
19 TRX420TM1 FM1_31HR3650.book Page 47 Tuesday, April 3, 2018 11:37 AM
Before Riding
Before each ride, you need to make sure you and your Honda are
both ready to ride. To help get you prepared, this section discusses
how to evaluate your riding readiness, what items you should check
on your ATV, and adjustments to make for your comfort,
convenience, or safety. This section also includes important
information about loading.
Before Riding
Are You Ready to Ride? .............................................................. 48
Protective Apparel ................................................................... 48
Rider Training .......................................................................... 50
Age Recommendation ............................................................. 51
No Passengers ......................................................................... 51
No Alcohol or Drugs ................................................................ 52
Is Your ATV Ready to Ride? ........................................................ 53
Pre-ride Inspection ................................................................... 53
Load Limits & Guidelines............................................................. 57
Loading ................................................................................... 57
Load Limits .............................................................................. 58
Loading Guidelines .................................................................. 59
Accessories & Modifications........................................................ 60
Accessories .............................................................................. 60
Modifications........................................................................... 61
Before Riding
47
19 TRX420TM1 FM1_31HR3650.book Page 48 Tuesday, April 3, 2018 11:37 AM
Are You Ready to Ride?
Before you ride your ATV for the first time, we urge you to:
• Read this owner’s manual and the labels on your ATV carefully.
• Make sure you understand all the safety messages.
• Know how to operate all the controls.
Before each ride, be sure:
• You feel well and are in good physical and mental condition.
• You are wearing an approved motorcycle helmet (with chin strap
tightened securely), eye protection, and other protective
clothing.
• You don’t have any alcohol or drugs in your system.
Protective Apparel
For your safety, we strongly recommend that you always wear an
approved motorcycle helmet, eye protection, boots, gloves, long
pants, and a long-sleeved shirt or jacket whenever you ride.
Although complete protection is not possible, wearing proper gear
can reduce the chance of injury when you ride.
Following are suggestions to help you choose the proper gear.
Helmet and Eye Protection
Your helmet is your most important piece of riding gear because it
offers the best protection against head injuries. A helmet should fit
your head comfortably and securely.
48 Before Riding
19 TRX420TM1 FM1_31HR3650.book Page 49 Tuesday, April 3, 2018 11:37 AM
Are You Ready to Ride?
An open-face helmet offers some protection, but a full-face helmet
offers more. Regardless of the style, look for a DOT (Department of
Transportation) sticker on any helmet you buy (USA only). Always
wear a face shield or goggles to protect your eyes and help your
vision.
WARNING
3 WARNING
Operating this ATV without wearing an
approved motorcycle helmet, eye protection,
and protective clothing could increase your
chances of severe injury or death in the event
of a crash.
Always wear an approved motorcycle helmet
that fits properly and wear eye protection
(goggles or face shield), gloves, boots, longsleeved shirt or jacket and long pants.
Additional Riding Gear
In addition to a helmet and eye protection, we also recommend:
• Sturdy off-road motorcycle boots to help protect your feet,
ankles, and lower legs.
• Off-road motorcycle gloves to help protect your hands.
• Riding pants with knee and hip pads, a riding jersey with padded
elbows, and a chest/shoulder protector.
Before Riding
49
19 TRX420TM1 FM1_31HR3650.book Page 50 Tuesday, April 3, 2018 11:37 AM
Are You Ready to Ride?
Rider Training
Developing your riding skills is an on-going process. Even if you have
ridden other ATVs, take time to become familiar with how this ATV
works and handles. Practice riding the ATV in a safe area to build
your skills. Do not ride in rough terrain until you get accustomed to
the ATV’s controls, and feel comfortable with its size and weight.
We urge all riders to take an ATV operator course approved by the
ATV Safety Institute (ASI). For information about the ASI training
course nearest you, call the national toll-free number; (800) 8872887 (USA only).
Other riding tips can be found in the Tips & Practice Guide for the
ATV Rider booklet that came with your ATV (USA only).
WARNING
3 WARNING
Operating this ATV without proper
instruction could increase your risk of a crash
which could lead to serious injury or death.
Beginning and inexperienced operators
should complete the certified training course
offered by Honda. They should then regularly
practice the skills learned in the course and
the operating techniques described in the
owner’s manual.
50 Before Riding
19 TRX420TM1 FM1_31HR3650.book Page 51 Tuesday, April 3, 2018 11:37 AM
Are You Ready to Ride?
Age Recommendation
The minimum recommended age for this ATV model is 16. For
safety, never let children under 16 years old operate this vehicle.
WARNING
3 WARNING
A child using an ATV that is not
recommended for their age could lose vehicle
control while riding, resulting in severe injury
or death.
A child under 16 should never operate an ATV
with engine size greater than 90cc.
No Passengers
This ATV is designed as an operator-only vehicle. The long seat is
designed to allow the rider to change body position, not for carrying
a passenger. Never let a passenger ride on the seat or on the front or
rear cargo racks.
WARNING
3 WARNING
Carrying a passenger on this ATV greatly
reduces your ability to balance and control
this ATV and could cause a crash and you or
your passenger could be injured or killed.
Never carry a passenger on this ATV.
Before Riding
51
19 TRX420TM1 FM1_31HR3650.book Page 52 Tuesday, April 3, 2018 11:37 AM
Are You Ready to Ride?
No Alcohol or Drugs
Alcohol, drugs and ATVs don’t mix. Even a small amount of alcohol
can impair your ability to operate an ATV safely. Likewise, drugs —
even if prescribed by a physician — can be dangerous while
operating an ATV. Consult your doctor to be sure it is safe to operate
a vehicle after taking medication.
WARNING
3 WARNING
Operating this ATV after consuming alcohol
or drugs can seriously affect your judgment,
cause you to react more slowly, affect your
balance and perception, and result in serious
injury or death.
Never consume alcohol or drugs before or
while operating this ATV.
52 Before Riding
19 TRX420TM1 FM1_31HR3650.book Page 53 Tuesday, April 3, 2018 11:37 AM
Is Your ATV Ready to Ride?
Before each ride, it’s important to inspect your ATV and make sure
any problem you find is corrected. A pre-ride inspection is a must,
not only for safety, but because having a breakdown, or even a flat
tire, can be a major inconvenience.
If your ATV has overturned or been involved in a collision, do not ride
the vehicle until it has been inspected by your dealer. There may be
damage or other problems you cannot see.
WARNING
3 WARNING
Improperly maintaining this ATV or failing to
correct a problem before riding can cause a
crash in which you can be seriously hurt or
killed.
Always perform a pre-ride inspection before
every ride and correct any problems.
Pre-ride Inspection
Check the following items before you get on the ATV:
Engine Oil
Check the level and add oil if needed
(page 123).
Check for leaks.
Radiator Coolant
Check the coolant level and add coolant if
needed (page 135).
Check for leaks.
(cont’d)
Before Riding
53
19 TRX420TM1 FM1_31HR3650.book Page 54 Tuesday, April 3, 2018 11:37 AM
Is Your ATV Ready to Ride?
Fuel
Check the level and add fuel (page 118) if
needed. Also make sure the fuel fill cap is
securely fastened.
Check for leaks.
Tires
Use a gauge to check the air pressure. Adjust
if needed. Also look for signs of damage or
excessive wear (page 170).
Drivetrain Boots
Check for damage (pages 179, 180).
Guards
Check for damage or looseness (pages 177,
178).
Nuts & Bolts
Check the wheels to see that the axle nuts are
tightened. Use a wrench to make sure all
accessible nuts, bolts, and fasteners are tight.
Underbody & Exhaust Check for, and remove, any dirt, vegetation
System
or other debris that could be a fire hazard or
interfere with the proper operation of the
vehicle.
Air Cleaner Housing
Drain Tube
Check for deposits in the drain tube. If
necessary, clean the tube (page 146) and
check the air cleaner housing.
Leaks, Loose Parts
Walk around your ATV and look for anything
that appears unusual, such as a leak or loose
cable.
54 Before Riding
19 TRX420TM1 FM1_31HR3650.book Page 55 Tuesday, April 3, 2018 11:37 AM
Is Your ATV Ready to Ride?
Cable
Check the cable housings for wear. Check
the fittings for looseness. Replace or tighten
as needed.
Lights
Make sure the headlight, brake light and
taillight are working properly.
If you are carrying cargo, also check the following:
Loading Limits
Make sure you do not exceed the load
limits (page 58).
Cargo
Check that all cargo is secure.
Check these items after you get on the ATV:
Throttle
Check the freeplay and adjust if needed.
Press the throttle to make sure it moves
smoothly without sticking, and snaps shut
automatically when it is released, in all
steering positions (page 147).
Brakes
Squeeze the front and rear brake levers
and step on the rear brake pedal to check
that the controls operate normally. Check
for proper freeplay (pages 163, 165). Make
sure there is no brake fluid leakage.
Reverse Assist Lever
Check the freeplay and adjust if needed
(page 150). Make sure the lever operates
smoothly without sticking.
(cont’d)
Before Riding
55
19 TRX420TM1 FM1_31HR3650.book Page 56 Tuesday, April 3, 2018 11:37 AM
Is Your ATV Ready to Ride?
Headlight and
Check for proper function (page 37).
Headlight Dimmer Switch
Engine Stop Switch
Check for proper function (page 36).
Steering
Check that the wheels turn properly as you
steer the handlebar. Move the handlebar
right and left and check that there is no
excessive backlash.
Remember, be sure to take care of any problem you find, or have
your dealer correct it before you ride.
56 Before Riding
19 TRX420TM1 FM1_31HR3650.book Page 57 Tuesday, April 3, 2018 11:37 AM
Load Limits & Guidelines
Your Honda was designed as a rider-only ATV. It was not designed
to carry a passenger. It can carry cargo on the cargo racks, however,
carrying cargo anywhere else or carrying a passenger could interfere
with your balance and control of the ATV.
In addition, exceeding the weight limits or carrying an unbalanced
load can seriously affect your ATV’s handling, braking and stability.
Adding accessories or making modifications that change this ATV’s
design and performance can also make it unsafe. Also, the weight of
any accessories will reduce the maximum load the ATV can carry.
More specific information on load limits, accessories, and
modifications follows.
Loading
How much weight you put on your ATV, and how you load it, are
important to your safety. If you decide to carry cargo, you should be
aware of the following information.
WARNING
3 WARNING
Overloading, improper loading, or carrying a
passenger can cause a crash and you can be
seriously hurt or killed.
Follow all load limits and other loading
guidelines in this manual.
Before Riding
57
19 TRX420TM1 FM1_31HR3650.book Page 58 Tuesday, April 3, 2018 11:37 AM
Load Limits & Guidelines
Load Limits
Following are the load limits for your ATV:
There are limits to how much weight can be carried on your ATV and
be pulled in a trailer.
The following load limits apply to standard equipment only.
Modifying your ATV, using non-standard equipment, or riding on
terrain that is not flat and smooth could further reduce these limits.
maximum weight capacity
485 lb (220 kg)
(includes the weight of the rider,
all cargo, and accessories.)
front cargo rack weight limit = 66 lb (30 kg)
rear cargo rack weight limit
= 133 lb (60 kg)
tow weight limit
= 850 lb (385 kg)
(Combined weight of the trailer
and all cargo in the trailer)
tongue weight
= 30 lb (14 kg) recommended
(Weight on the trailer tongue)
tongue and rear cargo weight = 133 lb (60 kg) maximum
(Combined weight on the
trailer tongue and on the rear
cargo rack)
Tongue weight can be measured with an ordinary bathroom scale.
Place the scale under the tongue, using either a tongue jack or other
support to keep the trailer level.
The weight of added accessories will reduce the maximum cargo
weight you can carry.
58 Before Riding
19 TRX420TM1 FM1_31HR3650.book Page 59 Tuesday, April 3, 2018 11:37 AM
Load Limits & Guidelines
Loading Guidelines
Carrying cargo or pulling a trailer will affect how your ATV handles
and greatly reduce its ability in accelerating, braking and making
turns and other maneuvers.
Be sure to observe the weight limits and follow these guidelines:
• Check that the tires are properly inflated.
• Do not place cargo anywhere on the ATV other than on the front
and rear racks. Otherwise, operating stability may be adversely
affected.
• Never ride with a passenger on the front or rear cargo racks. The
ATV is not designed to carry a passenger.
• Use the trailer hitch to tow another vehicle or trailer. Do not tow
by tying a rope or cable to the rear rack.
• Load cargo on the rear rack as far forward as possible. Make sure
cargo on the front rack does not interfere with handlebar
movement.
• Do not allow cargo to extend beyond the edges of either the
front or rear racks.
• Make sure all cargo is secured before riding.
• Balance cargo weight evenly on both sides.
• Never exceed the maximum weight limit.
• When towing a trailer, take care to maintain balance and
stability. Distribute cargo between the front and rear of the trailer
to obtain the recommended tongue weight.
• Allow extra room for starting, stopping and turning whenever
you carry cargo or pull a trailer.
• Avoid riding on steep slopes when carrying cargo or pulling a
trailer.
• Never cross a slope when towing a trailer.
Before Riding
59
19 TRX420TM1 FM1_31HR3650.book Page 60 Tuesday, April 3, 2018 11:37 AM
Accessories & Modifications
Modifying your ATV or using non-Honda accessories can make your
ATV unsafe.
Before you consider making any modifications or adding an
accessory, be sure to read the following information.
WARNING
3 WARNING
Improper accessories or modifications can
cause a crash in which you can be seriously
hurt or killed.
Follow all instructions in this owner’s manual
regarding accessories and modifications.
Accessories
We strongly recommend that you use only Honda Genuine or Honda
Signature Accessories that have been specifically designed and
tested for your ATV. Because Honda cannot test all other
accessories, you must be personally responsible for proper selection,
installation, and use of non-Honda accessories.
Check with your dealer for assistance and always follow these
guidelines:
• Make sure the accessory does not obscure any lights, reduce
ground clearance, limit suspension travel or steering travel, or
interfere with operating any controls.
• Make sure the accessory does not interfere with your ability to
shift body position on the seat or operate hand and foot controls.
• Do not add any electrical equipment that will exceed the vehicle’s
electrical system capacity (page 228). A blown fuse can cause a
loss of lights or engine power (page 213).
60 Before Riding
19 TRX420TM1 FM1_31HR3650.book Page 61 Tuesday, April 3, 2018 11:37 AM
Accessories & Modifications
Modifications
We strongly advise you not to remove any original equipment or
modify your ATV in any way that would change its design or
operation. Such changes could seriously impair your ATV’s handling,
stability, and braking, making it unsafe to ride.
We also advise you not to make any modifications or remove any
equipment (such as the USDA qualified spark arrester or emission
control system components) that would make your ATV illegal in
your area.
Removing or modifying your lights, exhaust system, emission control
system, or other equipment can also make your ATV illegal.
Before Riding
61
19 TRX420TM1 FM1_31HR3650.book Page 62 Tuesday, April 3, 2018 11:37 AM
62 Before Riding
19 TRX420TM1 FM1_31HR3650.book Page 63 Tuesday, April 3, 2018 11:37 AM
Basic Operation & Riding
This section gives basic riding instructions, including how to start and
stop your engine, and how to use the throttle and brakes. It also
provides important information on riding with cargo.
Basic Operation & Riding
To protect your new engine and enjoy optimum performance and
service life, refer to Break-in Guidelines (page 230).
Safe Riding Precautions .............................................................. 65
Off-road Use Only.................................................................... 65
Keep Hands and Feet on Controls............................................ 66
Control Speed ......................................................................... 67
Use Care on Unfamiliar or Rough Terrain ................................. 68
Do Not Perform Stunts............................................................. 69
Starting & Stopping the Engine................................................... 70
Preparation.............................................................................. 71
Starting Procedure ................................................................... 72
Flooded Engine........................................................................ 73
Bank Angle Sensor Ignition Cut-off System .............................. 73
Stalled Engine.......................................................................... 74
How to Stop the Engine........................................................... 75
Using the Recoil Starter (Canada only) ..................................... 76
Shifting Gears............................................................................. 77
Riding in Reverse ........................................................................ 79
(cont’d)
Basic Operation & Riding
63
19 TRX420TM1 FM1_31HR3650.book Page 64 Tuesday, April 3, 2018 11:37 AM
Basic Operation & Riding
Braking....................................................................................... 81
Riding Your ATV......................................................................... 83
Making Turns .......................................................................... 83
Skidding or Sliding................................................................... 85
Riding Up Hills ......................................................................... 86
Riding Down Hills .................................................................... 90
Crossing or Turning on Hills or Slopes ...................................... 91
Riding Over Obstacles .............................................................. 93
Riding Through Water ............................................................. 94
Parking ....................................................................................... 96
64 Basic Operation & Riding
19 TRX420TM1 FM1_31HR3650.book Page 65 Tuesday, April 3, 2018 11:37 AM
Safe Riding Precautions
Before riding your ATV for the first time, please review the ATV
Safety section beginning on page 1, and the Before Riding section
beginning on page 47.
Even if you have ridden other ATVs, take time to become familiar
with how this ATV works and handles. Practice in a safe area until
you build your skills and get accustomed to the ATV’s size and
weight.
Off-road Use Only
Your ATV and its tires are designed and manufactured for off-road
use only, not for pavement. Riding on pavement can affect handling
and control. You should not ride your ATV on pavement.
WARNING
3 WARNING
Operating this ATV on paved surfaces may
seriously affect handling and control of the
ATV, and may cause the vehicle to go out of
control.
Never operate the ATV on any paved surfaces,
including sidewalks, driveways, parking lots
and streets.
When riding off-road, also remember to always obey local off-road
riding laws and regulations. Obtain permission to ride on private
property. Avoid posted areas and obey “no trespassing” signs.
Basic Operation & Riding
65
19 TRX420TM1 FM1_31HR3650.book Page 66 Tuesday, April 3, 2018 11:37 AM
Safe Riding Precautions
You should never ride your ATV on public streets, roads or highways,
even if they are not paved. Drivers of street vehicles may have difficulty
seeing and avoiding you, which could lead to a collision. In many states
it is illegal to operate ATVs on public streets, roads and highways.
WARNING
3 WARNING
Operating this ATV on public streets, roads or
highways could cause you to collide with
another vehicle.
Never operate this ATV on any public street,
road or highway, even a dirt or gravel one.
Keep Hands and Feet on Controls
Always keep both hands on the handlebars and both feet on the footpegs
when riding your ATV. This is important to maintain your balance and to
control the vehicle. Removing even one hand from the handlebars or one
foot from the footpegs can reduce your ability to control the ATV or could
cause you to lose your balance and fall off the ATV.
WARNING
3 WARNING
Removing hands from handlebars or feet
from footpegs during operation can reduce
your ability to control the ATV or could cause
you to lose your balance and fall off of the
ATV.
Always keep both hands on the handlebars
and both feet on the footpegs of your ATV
during operation.
66 Basic Operation & Riding
19 TRX420TM1 FM1_31HR3650.book Page 67 Tuesday, April 3, 2018 11:37 AM
Safe Riding Precautions
Control Speed
Riding at excessive speed increases the chance of a crash. In
choosing a proper speed, you need to consider the capability of your
vehicle, the terrain, visibility and other operating conditions, plus
your own skills and experience.
WARNING
3 WARNING
Operating this ATV at excessive speeds
increases your chances of losing control of the
ATV, which can result in a crash.
Always go at a speed that is proper for your
vehicle, the terrain, visibility and other
operating conditions, and your experience.
Basic Operation & Riding
67
19 TRX420TM1 FM1_31HR3650.book Page 68 Tuesday, April 3, 2018 11:37 AM
Safe Riding Precautions
Use Care on Unfamiliar or Rough Terrain
Before riding in a new area, always check the terrain thoroughly.
Don’t ride fast on unfamiliar terrain or when visibility is limited. (It’s
sometimes difficult to see obstructions like hidden rocks, bumps, or
holes in time to react.)
WARNING
3 WARNING
Failure to use extra care when operating this
ATV on unfamiliar terrain could result in the
ATV overturning or going out of control.
Go slowly and be extra careful when
operating on unfamiliar terrain. Always be
alert to changing terrain conditions when
operating the ATV.
68 Basic Operation & Riding
19 TRX420TM1 FM1_31HR3650.book Page 69 Tuesday, April 3, 2018 11:37 AM
Safe Riding Precautions
Never ride past the limit of visibility. Maintain a safe distance
between your ATV and other off-road vehicles. Always exercise
caution, and use extra care on rough, slippery and loose terrain.
WARNING
3 WARNING
Failure to use extra care when operating on
excessively rough, slippery or loose terrain
could cause loss of traction or vehicle control,
which could result in a crash, including an
overturn.
Do not operate on excessively rough, slippery
or loose terrain until you have learned and
practiced the skills necessary to control the
ATV on such terrain. Always be especially
cautious on these kinds of terrain.
Do Not Perform Stunts
You should always operate your ATV in a safe and reasonable
manner. When riding, always keep all four wheels on the ground.
WARNING
3 WARNING
Attempting wheelies, jumps, and other stunts
increases the chance of a crash, including an
overturn.
Never attempt stunts, such as wheelies or
jumps. Don’t try to show off.
Basic Operation & Riding
69
19 TRX420TM1 FM1_31HR3650.book Page 70 Tuesday, April 3, 2018 11:37 AM
Starting & Stopping the Engine
Always follow the proper starting procedure described below.
For your safety, avoid starting or operating the engine in an enclosed
area such as a garage. Your ATV’s exhaust contains poisonous
carbon monoxide gas which can collect rapidly in an enclosed area
and cause illness or death.
WARNING
3 WARNING
Running the engine of your vehicle while in
an enclosed or even partially enclosed area
can cause a rapid build-up of toxic carbon
monoxide gas.
Breathing this colorless, odorless gas can
quickly unconsciousness and lead to death.
Only run your vehicle’s engine when it is
located in a well ventilated area outdoors.
70 Basic Operation & Riding
19 TRX420TM1 FM1_31HR3650.book Page 71 Tuesday, April 3, 2018 11:37 AM
Starting & Stopping the Engine
Preparation
(TRX420FM1)
(TRX420TM1)
(2)
(2)
(3)
(1)
(1) ignition switch
(3) engine stop switch
(2) neutral indicator
1. Before starting, select a level surface and lock the parking brake
(page 41).
2. Turn the ignition switch (1) to ON (q).
Basic Operation & Riding
71
19 TRX420TM1 FM1_31HR3650.book Page 72 Tuesday, April 3, 2018 11:37 AM
Starting & Stopping the Engine
Confirm the following:
• TRX420TM1: The transmission is in neutral, and the neutral
indicator (2) is ON.
TRX420FM1: The transmission is in neutral, the neutral indicator
(2) is ON and the gear position indicator shows “N”
• The engine stop switch (3) is set to RUN (e).
Starting Procedure
This ATV is fuel-injected with an automatic choke.
Follow the procedure indicated below.
Any Air Temperature
• Press the start button with the throttle completely closed,
The engine will not start if the throttle is fully open (because the
electronic control module cuts off the fuel supply).
Snapping the throttle or fast idling for more than 5 minutes may
cause exhaust pipe and muffler discolorations.
72 Basic Operation & Riding
19 TRX420TM1 FM1_31HR3650.book Page 73 Tuesday, April 3, 2018 11:37 AM
Starting & Stopping the Engine
Flooded Engine
If the engine fails to start after repeated attempts, it may be flooded
with excess fuel. To clear a flooded engine:
1. Leave the engine stop switch set to RUN (e).
2. Open the throttle fully.
3. (USA)
Press the start button for 5 seconds.
(Canada)
Press the start button for 5 seconds (or operate the recoil starter
several times).
4. Follow the normal starting procedure.
5. If the engine starts, then open the throttle slightly if idling is
unstable.
If the engine does not start, wait 10 seconds, then follow steps
1 – 4 again.
If the engine still won’t start, refer to If Your Engine Quits or Won’t
Start, page 204.
Bank Angle Sensor Ignition Cut-off System
Your vehicle’s banking (lean angle) sensor system is designed to
automatically stop the engine if the vehicle is overturned.
Before restarting the engine, you must turn the ignition switch to the
OFF (w) position and then back to ON (q). The engine will not restart
until you perform this procedure.
Basic Operation & Riding
73
19 TRX420TM1 FM1_31HR3650.book Page 74 Tuesday, April 3, 2018 11:37 AM
Starting & Stopping the Engine
Stalled Engine
You can restart the engine while the vehicle is stopped by squeezing
the front brake lever and pressing the start button.
Do not press the throttle lever while starting in gear. The engine will
not start with the throttle fully open and in gear.
Once you have started the engine, release the front brake lever, then
apply throttle gradually.
74 Basic Operation & Riding
19 TRX420TM1 FM1_31HR3650.book Page 75 Tuesday, April 3, 2018 11:37 AM
Starting & Stopping the Engine
How to Stop the Engine
Normal Engine Stop
To stop the engine, make sure the transmission is in neutral by
checking that the neutral indicator light is on, then turn the ignition
switch to OFF (w).
The engine stop switch should normally remain in the RUN (e)
position even when the engine is OFF.
If your ATV is stopped with the engine stop switch OFF (r) and the
ignition switch ON (q), the battery will discharge.
Emergency Engine Stop
To stop the engine in an emergency, use the engine stop switch. To
operate, slide the switch to either OFF (r) position.
Basic Operation & Riding
75
19 TRX420TM1 FM1_31HR3650.book Page 76 Tuesday, April 3, 2018 11:37 AM
Starting & Stopping the Engine
Using the Recoil Starter (Canada only)
The recoil starter is used to start the engine when the battery is low.
To operate the recoil starter:
1. Turn the ignition switch to ON and engine stop switch to RUN.
2. Check that the transmission is in neutral.
3. Grasp the starter grip (1) firmly, then pull it out slowly
approximately 4 in (100 mm).
4. Pull the grip up briskly and fully.
5. After the engine starts, allow the starter grip to return slowly and
then let go.
If the starter grip does not return smoothly (because of dirt in the
assembly), see your dealer.
RIGHT SIDE
(1)
(1) starter grip
76 Basic Operation & Riding
19 TRX420TM1 FM1_31HR3650.book Page 77 Tuesday, April 3, 2018 11:37 AM
Shifting Gears
UPSHIFTING SEQUENCE
DOWNSHIFTING SEQUENCE
Your ATV has five forward gears: 1, 2, 3, 4, and 5.
The shift lever is located near the left footpeg. One full stroke of the
shift lever shifts the transmission to the next higher or lower gear in
the shifting sequence. The shift lever automatically returns to the
horizontal position when released.
To upshift to a higher gear, put the toe of your boot under the shift
lever and raise it one full stroke. To downshift, step on the shift lever
and depress it one full stroke.
To select reverse, see Riding in Reverse, page 79.
After starting the engine and letting it warm up, follow these
procedures:
1. With the transmission in neutral, release the parking brake, but
continue squeezing the rear brake lever.
Basic Operation & Riding
77
19 TRX420TM1 FM1_31HR3650.book Page 78 Tuesday, April 3, 2018 11:37 AM
Shifting Gears
2. With the throttle closed, raise the shift lever one full stroke to
shift into 1st (first) gear.
3. Release the rear brake lever and increase engine speed by
gradually opening the throttle.
4. When speed increases, release the throttle and shift to 2nd gear
by raising the shift lever one full stroke.
5. Repeat this sequence to progressively upshift to 3rd, 4th and 5th
(top) gear.
6. To downshift, reverse this sequence. Remember to close the
throttle each time you shift to the next lower gear.
Learning when to shift gears comes with experience. Keep the
following tips in mind:
• As a general rule, shift while moving in a straight line.
• Close the throttle completely before shifting. Improper shifting
may damage the engine, transmission, and drivetrain.
• Upshift to a higher gear or reduce throttle before engine rpm
(speed) gets too high. Learn the relationship between engine
sound and the normal shifting points.
• Downshift to a lower gear before you feel the engine laboring
(lugging) at low rpm.
• Avoid downshifting to help slow your ATV when engine rpm is
high. Downshifting when engine speed is near its allowable
maximum may over-rev the engine and possibly cause damage.
• To prevent transmission damage, do not coast or tow the ATV for
long distances with the engine off.
Recommended Shift Points
Ride in the highest gear that lets the engine run and accelerate
smoothly.
This will give you good fuel economy and effective emissions control.
78 Basic Operation & Riding
19 TRX420TM1 FM1_31HR3650.book Page 79 Tuesday, April 3, 2018 11:37 AM
Riding in Reverse
If you need to ride in reverse, make sure the area behind you is clear
and only operate the ATV at low speed.
WARNING
3 WARNING
Improperly operating in reverse could cause
you to hit an obstacle or person behind you,
resulting in serious injury.
Make sure there are no obstacles or people
behind you before selecting reverse gear.
When it is safe to proceed, go slowly.
1. Bring the vehicle to a complete stop, then make sure the
transmission is in neutral.
2. Be sure there are no obstacles or people in the way.
3. Rotate the P/R lever (1) counterclockwise to engage the P/R lever
with the reverse assist lever (2).
4. Squeeze the rear brake lever/parking brake lever (3), then depress
the shift lever once to shift into “R” (reverse) gear.
LEFT HANDLEBAR
(1)
(3)
(2)
(1) P/R lever
(2) reverse assist lever
(3) rear brake lever/parking brake lever
Basic Operation & Riding
79
19 TRX420TM1 FM1_31HR3650.book Page 80 Tuesday, April 3, 2018 11:37 AM
Riding in Reverse
NOTICE
Your ATV may be equipped with a reverse speed limiter, which helps
the vehicle to maintain a safe speed while riding in reverse gear.
5. Make sure the reverse indicator comes on. (TRX420TM1: the
reverse indicator is on. TRX420FM1: the reverse indicator is on
and the gear position indicator shows “R”)
6. Release the rear brake lever/parking brake lever.
7. Open the throttle gradually and ride slowly. Do not open the
throttle suddenly or make abrupt turns.
8. To stop, close the throttle and gradually and apply both the front
and rear brakes. Do not abruptly apply the rear brake alone.
9. To shift out of reverse and into neutral, raise the shift lever one
stroke to shift into “N” (neutral) gear.
(TRX420TM1: the neutral indicator is on. TRX420FM1: the
neutral indicator is on and the gear position indicator shows “N”)
WARNING
3 WARNING
Applying only the rear brake abruptly when
operating in reverse gear could cause the
front wheels to lift off the ground and the
ATV could overturn backwards.
Carefully apply both the front and rear brakes
when stopping in reverse gear.
80 Basic Operation & Riding
19 TRX420TM1 FM1_31HR3650.book Page 81 Tuesday, April 3, 2018 11:37 AM
Braking
Your ATV is equipped with disc brakes on both front wheels which
are hydraulically activated by operating the right brake lever. A single
drum brake on the rear axle housing is mechanically activated by
depressing the brake pedal or operating the left brake lever.
Except TRX420TM1:
Although the front and rear brakes have separate controls, all four
wheels are interconnected when your ATV is in the 4WD mode. So
operating any brake control in the 4WD mode will cause braking at
both the front and rear wheels.
As a general rule, the front braking system provides about 70
percent of total stopping power.
For full braking effectiveness, use both the pedal and lever
simultaneously. Using both braking systems will stop your ATV faster
with greater stability.
To slow or stop, apply the brake lever and brake pedal smoothly, while
downshifting to match your speed.
Gradually increase braking as you feel the brakes slowing your
speed. The increase in engine compression from downshifting will
help slow your ATV.
Applying the brakes too hard may cause the wheels to lock and slide,
reducing control of your ATV. If this happens, release the brake
controls, steer straight ahead until you regain control, then reapply
the brakes more gently.
When possible, reduce your speed or complete braking before
entering a turn. Avoid braking or closing the throttle quickly while
turning. Either action may cause one or more wheels to slip and
reduce your control of your ATV.
Basic Operation & Riding
81
19 TRX420TM1 FM1_31HR3650.book Page 82 Tuesday, April 3, 2018 11:37 AM
Braking
Your ability to brake in a turn and to brake hard in an emergency
situation are important riding skills.
When descending a long, steep grade, use engine compression
braking by downshifting, with intermittent use of both brakes.
Continuous brake application can overheat the brakes and reduce
their effectiveness.
Riding with your foot resting on the brake pedal or your hands on
the brake levers may overheat the brakes, reducing effectiveness.
For information on how to apply the brakes in various riding
situations, see the following section, Riding Your ATV.
82 Basic Operation & Riding
19 TRX420TM1 FM1_31HR3650.book Page 83 Tuesday, April 3, 2018 11:37 AM
Riding Your ATV
Making Turns
Learn how to turn your ATV properly. Practice the techniques
outlined in this section on level ground and at low speeds until you
are confident in making turns.
WARNING
3 WARNING
Turning improperly can make the ATV go out
of control, causing a collision or overturn.
• Always follow proper procedures for
turning as described in this owner’s manual.
• Practice turning at low speeds before
attempting to turn at faster speeds.
• Do not turn at excessive speeds.
Basic Operation & Riding
83
19 TRX420TM1 FM1_31HR3650.book Page 84 Tuesday, April 3, 2018 11:37 AM
Riding Your ATV
Lean your body to the inside of a turn and forward.
To make a turn on level ground: Steer the handlebar and lean your
body toward the inside of the turn. Leaning helps balance the
vehicle, and it feels more comfortable. Leaning into a turn is an
important technique to master in riding an ATV.
To make a sharp turn at low speed: It helps to shift your body slightly
forward on the seat, and lean inside, as you steer the handlebar.
Shifting weight forward allows the rear wheels to turn easier, and it
also improves front-wheel steering.
To make a turn from a full stop: Apply the throttle gradually when
you turn and start at the same time. Remember to shift your body
forward to make sharp low-speed turns and whenever you turn
while accelerating from a full stop.
84 Basic Operation & Riding
19 TRX420TM1 FM1_31HR3650.book Page 85 Tuesday, April 3, 2018 11:37 AM
Riding Your ATV
Skidding or Sliding
The terrain surface can be a major factor affecting turns. Skidding
during a turn is more likely to occur on slippery surfaces, such as
snow, ice, mud and loose gravel. If you skid on ice, you may lose all
directional control. To avoid skidding on slippery terrain, keep your
speed low and ride with caution.
WARNING
3 WARNING
Skidding or sliding improperly may cause you
to lose control of this ATV. You may also
regain traction unexpectedly, which may
cause the ATV to overturn.
Learn to safely control skidding by practicing
at low speeds and on level, smooth terrain.
If your ATV skids sideways during a turn, steer in the direction of the
skid. Avoid hard braking or accelerating until you have regained
directional control.
Basic Operation & Riding
85
19 TRX420TM1 FM1_31HR3650.book Page 86 Tuesday, April 3, 2018 11:37 AM
Riding Your ATV
Riding Up Hills
The ATV’s ability to safely climb hills largely depends on the rider’s
skill and judgment. Begin by practicing on smooth, gentle slopes. As
you gain experience, you’ll learn the hazards and your own
limitations. You may then proceed to ride on more difficult terrain.
However, you must be able to decide which hills or hazards might
cause the ATV to overturn. Avoid excessively steep hills.
WARNING
3 WARNING
Operating on excessively steep hills can cause
the vehicle to overturn more easily than
operating on level surfaces or small hills.
Never operate the ATV on hills too steep for
the ATV or for your abilities.
When climbing hills, you must shift weight toward the front wheels
to help keep them on the ground. To do this, shift your body slightly
forward on the seat and lean forward. For greater weight shift, move
your body farther forward and lean forward.
WARNING
3 WARNING
Climbing hills improperly could cause loss of
control or cause the ATV to overturn.
Always follow proper procedures for climbing
hills as described in this owner’s manual.
86 Basic Operation & Riding
19 TRX420TM1 FM1_31HR3650.book Page 87 Tuesday, April 3, 2018 11:37 AM
Riding Your ATV
Shift weight forward when climbing hills.
• Always check the terrain carefully before you start up any hill.
• Never climb hills with excessively slippery or loose surfaces.
• To climb a hill, take a running start in an appropriate gear and
speed for the conditions. Maintain a steady speed as you ascend
the hill.
• Never open the throttle suddenly or make sudden gear changes.
The ATV could flip over backward.
• Never go over the top of any hill at high speed. An obstacle, a
sharp drop, or another vehicle or person could be on the other
side of the hill.
Basic Operation & Riding
87
19 TRX420TM1 FM1_31HR3650.book Page 88 Tuesday, April 3, 2018 11:37 AM
Riding Your ATV
Stalling the ATV and/or Rolling Backwards:
If you incorrectly estimate climbing capability or terrain conditions,
the ATV may not have enough power or traction to continue uphill.
If this happens, the ATV can stall and/or roll backwards.
WARNING
3 WARNING
Stalling, rolling backwards or improperly
dismounting while climbing a hill could result
in the ATV overturning.
Always follow proper procedures for climbing
a hill as described in this owner’s manual.
What to do if the ATV stalls or rolls backwards when climbing a hill:
If you are about to lose all forward speed:
1. Using the front and rear brakes together, bring the ATV to a stop
with the vehicle pointed straight uphill.
2. Get off the ATV while you continue holding the brakes.
3. Shift into neutral, set the parking brake and turn the engine off.
4. Then assess the situation.
If the ATV starts rolling backwards before you begin braking:
1. Keep your weight uphill.
2. Carefully apply the front brakes first, then carefully apply the rear
brake. Do not apply either brake abruptly if you are rolling
backwards, or the vehicle may overturn.
If the ATV continues sliding backwards:
After you’ve applied the brakes, get off and away from the vehicle.
Except TRX420TM1:
Remember that operating any brake control in the 4WD mode will
cause braking at both the front and rear wheels.
88 Basic Operation & Riding
19 TRX420TM1 FM1_31HR3650.book Page 89 Tuesday, April 3, 2018 11:37 AM
Riding Your ATV
What to do after the ATV has stalled or rolled backwards:
If the hill is too steep or too slippery, or if you have any doubt
whether you can safely walk the ATV back down the hill, leave the
vehicle where it is and get help. If possible, block the wheels so the
vehicle doesn’t roll backwards.
If the hill is not too steep and you have good footing, you may be
able to walk the ATV back down the hill. Make sure your intended
path is clear in case you lose control of the ATV.
Be sure your legs are
clear of the wheels.
Body position for
backing down a hill.
1. Stand with your body facing downhill, beside the vehicle so you
can reach the rear brake lever with your right hand.
2. Be sure your legs are clear of the wheels.
Check your footing.
3. Slowly and carefully back the ATV down the hill using the rear
brake lever to control speed.
4. If you lose control of the ATV, for your safety, get away from the
vehicle.
Basic Operation & Riding
89
19 TRX420TM1 FM1_31HR3650.book Page 90 Tuesday, April 3, 2018 11:37 AM
Riding Your ATV
Riding Down Hills
It’s usually advisable to descend hills with the ATV pointed straight
downhill. Avoid angles that would cause the vehicle to lean sharply
to one side.
WARNING
3 WARNING
Going down a hill improperly could cause loss
of control or cause the ATV to overturn.
Always follow proper procedures for going
down hills as described in this owner’s
manual.
On downhills, shift your weight back.
As you approach a downhill, stop and survey the terrain below.
Never ride past the limit of your visibility. Never go down a hill at
high speed.
90 Basic Operation & Riding
19 TRX420TM1 FM1_31HR3650.book Page 91 Tuesday, April 3, 2018 11:37 AM
Riding Your ATV
When you’ve selected a safe downhill path, shift into a lower gear,
shift your weight back with your arms extended and braced against
the handlebar, then go down slowly with the throttle closed.
Use mainly the rear brake to control speed. Avoid using either the
front brake or rear brake hard or abruptly when riding down hills.
Except TRX420TM1:
Remember that operating any brake control in the 4WD mode will
cause braking at both the front and rear wheels.
Remember, braking effectiveness is reduced on any hill with a loose
surface.
Crossing or Turning on Hills or Slopes
Riding on hills or slopes is different from riding on level terrain. Be
careful when riding on any hill. Make sure that you practice on
gentle, smooth slopes before attempting to ride on steeper or more
difficult terrain.
WARNING
3 WARNING
Improperly crossing hills or turning on hills
could cause loss of control or cause the ATV to
overturn.
Always follow proper procedures for crossing
or turning on slopes as described in this
owner’s manual. Avoid crossing steep hills if
possible.
Basic Operation & Riding
91
19 TRX420TM1 FM1_31HR3650.book Page 92 Tuesday, April 3, 2018 11:37 AM
Riding Your ATV
Crossing Hills or Slopes
• To maintain balance and stability when riding across a slope, you
need to shift weight toward the uphill side of the vehicle. To do
this, move your body off the center of the seat and lean toward
the uphill side.
• On a slippery or loose surface, you may also need to steer slightly
uphill to maintain a straight course across the slope.
• Avoid crossing hills that are excessively steep, slippery or rough.
Shift weight uphill when crossing slopes.
Making Turns on Slopes
• Compared to riding on level ground, you may need to shift more
weight and lean more when making turns on slopes.
• Do not make turns on any slopes until you have first mastered the
techniques for making turns on level terrain.
92 Basic Operation & Riding
19 TRX420TM1 FM1_31HR3650.book Page 93 Tuesday, April 3, 2018 11:37 AM
Riding Your ATV
Riding Over Obstacles
Before operating in a new area, check for obstacles. Watch out for
bumps, rain ruts, potholes and other obstacles in the terrain. When
you approach any obstacle, reduce your speed and be prepared to
stop.
Never try to ride over large obstacles, such as large rocks or fallen
logs.
WARNING
3 WARNING
Improperly operating over obstacles could
cause loss of control or a collision and could
cause the ATV to overturn.
When you go over obstacles, always follow
proper procedures as described in this
owner’s manual.
Basic Operation & Riding
93
19 TRX420TM1 FM1_31HR3650.book Page 94 Tuesday, April 3, 2018 11:37 AM
Riding Your ATV
Riding Through Water
Your ATV is designed to travel through water up to approximately
10 inches (254 mm) deep. Before crossing a stream, make sure the
water is not too deep or flowing too fast.
WARNING
3 WARNING
The ATV tires have some ability to float.
Operating this ATV through deep or fastflowing water may cause a loss of traction
and loss of control, which could lead to a
crash.
Never operate this ATV in fast-flowing water
or in water deeper than that specified in this
owner’s manual.
NOTICE
Water entering the muffler may damage the oxygen sensor and
result in emissions control system malfunction. Have your ATV dealer
inspect the oxygen sensor immediately after water enters the
muffler.
1. Choose a path where both banks have gradual slopes.
2. Proceed through the water at a slow, steady speed.
3. Watch out for submerged obstacles and slippery rocks.
4. Avoid getting the spark plug or air cleaner wet, as this would
cause the engine to stop.
5. After leaving the water, always test both the front and rear
brakes.
94 Basic Operation & Riding
19 TRX420TM1 FM1_31HR3650.book Page 95 Tuesday, April 3, 2018 11:37 AM
Riding Your ATV
• Riding through water can make the brakes less effective than
normal, and may reduce stopping ability.
• If necessary, apply the brakes repeatedly until they dry out and
operate normally.
• If the brakes don’t regain effectiveness, stop your ATV and
follow the procedures on page 169.
Basic Operation & Riding
95
19 TRX420TM1 FM1_31HR3650.book Page 96 Tuesday, April 3, 2018 11:37 AM
Parking
1. Look for level parking area. Make sure the ground surface is firm.
2. After bringing your ATV to a stop, hold the brakes while you shift
into neutral.
3. Set the parking brake.
4. Turn the ignition switch to OFF (w).
If it is necessary to start the engine when your ATV in gear and is
stopped on a grade, rock the vehicle back and forth to allow shifting
the transmission into neutral.
The brake lights are activated by applying the parking brake. When
using the parking brake, be sure to turn the ignition switch to OFF
(w) to avoid discharging the battery.
Parking on a Steep Incline or a Loose or Slippery Surface
If you must park your ATV on a steep incline or loose or slippery
surface, use the following procedure:
1. While holding the brakes, set the parking brake.
2. Turn the ignition switch to OFF (w) and release the brakes.
3. If the ATV begins to move, either while sitting on it or after you
dismount, find a better parking location.
4. If rocks or other objects are available, you can block the wheels
as shown for additional security.
96 Basic Operation & Riding
19 TRX420TM1 FM1_31HR3650.book Page 97 Tuesday, April 3, 2018 11:37 AM
Servicing Your Honda
To help keep your ATV in good shape, this section includes a
Maintenance Schedule for required service and step-by-step
instructions for specific maintenance tasks. You’ll also find important
safety precautions, information on fuels and oils, and tips for
keeping your Honda looking good.
Servicing Your Honda
For information about replacing fuses, see page 213.
For information about the exhaust emission and noise requirements
of the U.S. Environmental Protection Agency (EPA) and Environment
Climate Change Canada (ECCC), see page 231.
USA only
Maintenance, replacement or repair of the emission control
devices and systems may be performed by any ATV repair
establishment or individual using parts that are “certified” to
EPA standards.
Before You Service Your Honda
The Importance of Maintenance ................................................. 99
Maintenance Safety .................................................................. 100
Important Safety Precautions ................................................. 101
Maintenance Schedule ............................................................. 102
Maintenance Record................................................................. 106
Service Preparations
Maintenance Component Locations ......................................... 107
Tool Kit .................................................................................... 110
Owner’s Manual Storage .......................................................... 111
Seat Removal............................................................................ 112
Tank Cover Assembly Removal ................................................. 113
Rear Fender Cover Removal ...................................................... 115
Clip Removal ............................................................................ 116
(cont’d)
Servicing Your Honda
97
19 TRX420TM1 FM1_31HR3650.book Page 98 Tuesday, April 3, 2018 11:37 AM
Servicing Your Honda
Service Procedures
Fluids & Filters
Fuel .......................................................................................... 117
Engine Oil & Filter ..................................................................... 120
Rear Final Gear Oil .................................................................... 129
Front Final Gear Oil (Except TRX420TM1).................................. 132
Coolant .................................................................................... 134
Air Cleaner ............................................................................... 141
Engine
Throttle .................................................................................... 147
Clutch System .......................................................................... 149
Reverse Lock System ................................................................. 150
Spark Plug ................................................................................ 151
Valves....................................................................................... 154
Spark Arrester .......................................................................... 155
Chassis
Suspension ............................................................................... 156
Brakes ...................................................................................... 159
Tires ......................................................................................... 170
Guards ..................................................................................... 177
Drivetrain Boots ........................................................................ 179
Electrical
Battery ..................................................................................... 181
Appearance Care...................................................................... 186
98 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 99 Tuesday, April 3, 2018 11:37 AM
Before You Service Your Honda
The Importance of Maintenance
A well-maintained ATV is essential for safe, economical, and troublefree riding. It will also help reduce air pollution. Careful pre-ride
inspections and good maintenance are especially important because
your ATV is designed to be ridden over rough off-road terrain.
To help you properly care for your ATV, this section of the manual
provides a Maintenance Schedule. The service intervals in this
schedule are based on average riding conditions.
WARNING
3 WARNING
Improperly maintaining this ATV or failing to
correct a problem before you ride can cause a
crash in which you can be seriously hurt or
killed.
Always follow the inspection and
maintenance recommendations and
schedules in this owner’s manual.
Frequent servicing of the air cleaner is especially important to help
you avoid a possible costly engine repair.
If your ATV overturns or is involved in a crash, be sure your dealer
inspects all major parts, even if you are able to make some repairs.
Servicing Your Honda
99
19 TRX420TM1 FM1_31HR3650.book Page 100 Tuesday, April 3, 2018 11:37 AM
Maintenance Safety
This section includes instructions on how to perform some important
maintenance tasks. If you have basic mechanical skills, you can
perform many of these tasks with the tools provided with your ATV.
Other tasks that are more difficult and require special tools are best
performed by professionals. Removing the wheels should normally
be handled only by a Honda technician or other qualified mechanic.
Instructions are included in this manual only to assist in emergency
service.
Some of the most important safety precautions follow. However, we
cannot warn you of every conceivable hazard that can arise in
performing maintenance. Only you can decide whether or not you
should perform a given task.
WARNING
3 WARNING
Failure to properly follow maintenance
instructions and precautions can cause you to
be seriously hurt or killed.
Always follow the procedures and
precautions in this owner’s manual.
100 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 101 Tuesday, April 3, 2018 11:37 AM
Maintenance Safety
Important Safety Precautions
• Make sure the engine is off before you begin any maintenance or
repairs. This will help eliminate several potential hazards:
Carbon monoxide poisoning from engine exhaust. Be sure
there is adequate ventilation whenever you operate the engine.
Burns from hot ATV parts. Let the engine and exhaust system
cool before touching.
Injury from moving parts. Do not run the engine unless
instructed to do so.
• Read the instructions before you begin, and make sure you have
the tools and skills required.
• To reduce the possibility of a fire or explosion, be careful when
working around gasoline. Use only non-flammable solvent, not
gasoline, to clean parts. Keep cigarettes, sparks, and flames away
from all fuel-related parts.
Remember that your Honda dealer knows your ATV best and is fully
equipped to maintain and repair it. To ensure the best quality and
reliability, use only new Honda Genuine Parts or other equivalents
for repair and replacement. If you have the tools and skills required
for additional maintenance jobs, you can purchase an official Honda
Service Manual (page 238).
Servicing Your Honda 101
19 TRX420TM1 FM1_31HR3650.book Page 102 Tuesday, April 3, 2018 11:37 AM
Maintenance Schedule
The required Maintenance Schedule that follows specifies how often
you should have your ATV serviced, and what things need attention.
It is essential to have your ATV serviced as scheduled to maintain
safe, dependable performance and proper emission control.
The service intervals in this Maintenance Schedule are based on
average riding conditions. Some items will need more frequent
service if you ride in unusually wet or dusty areas or at full throttle.
Consult your dealer for recommendations applicable to your
individual needs and use.
Some items in the Maintenance Schedule can be performed with
basic mechanical skills and hand tools. Procedures for these items
are provided in this manual. Other items involve more extensive
procedures and may require special training, tools, and equipment.
We recommend that you have your dealer perform these tasks
unless you have advanced mechanical skills and the required tools
and equipment. Procedures for such items in this schedule are
provided in an official Honda Service Manual available for purchase
(page 238).
If you do not feel capable of performing a given task or need
assistance, remember that your Honda dealer knows your ATV best
and is fully equipped to maintain and repair it. If you decide to do
your own maintenance, use only Honda Genuine Parts or their
equivalents for repair or replacement to ensure the best quality and
reliability.
102 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 103 Tuesday, April 3, 2018 11:37 AM
Maintenance Schedule
Perform the pre-ride inspection (page 53) and owner maintenance
on this section at each scheduled maintenance period.
Each item on the maintenance schedule requires some mechanical
knowledge. Certain items (particularly those marked * and **) may
require more technical information and tools. Consult your dealer.
Should be serviced by your dealer, unless the owner has proper
tools and service data and is mechanically qualified. Refer to the
official Honda Service Manual (page 238).
** In the interest of safety, we recommend these items be serviced
only by your dealer.
*
Summary of Maintenance Schedule Notes & Procedures:
NOTES:
1. Service more frequently when riding in dusty areas, sand or
snow.
2. Service more frequently after riding in very wet or muddy
conditions.
3. Replace every 2 years. Replacement requires mechanical skill.
Servicing Your Honda 103
19 TRX420TM1 FM1_31HR3650.book Page 104 Tuesday, April 3, 2018 11:37 AM
Maintenance Schedule
Maintenance Procedures:
I: inspect and clean, adjust, lubricate, or replace, if necessary
C: clean
A: adjust
L: lubricate
R: replace
FREQUENCY
ITEMS
*
FUEL LINE
*
THROTTLE OPERATION
AIR CLEANER
AIR CLEANER HOUSING
DRAIN TUBE
SPARK PLUG
*
VALVE CLEARANCE
ENGINE OIL
WHICHEVER
COMES FIRST
NOTE
*
ENGINE IDLE SPEED
RADIATOR COOLANT
COOLING SYSTEM
REGULAR
MAINT.
MAINT. INTERVAL
100
150
1
20
600
1000
6
100
1200
2000
12
200
I
I
C
I
NOTE 1
NOTE 2
C
I
NOTE 3
NOTE 2
I
I
I
I
I
INITIAL=
100 mi (150km), 20
operating hours or 1
month: R
REGULAR=
Every 600 mi (1,000 km),
100 operating hours or 12
months: R
I
I
I
I
I
I
I
ENGINE OIL FILTER
*
mi
km
MONTH
HOURS
INITIAL
Refer to
page
—
147
141
146
151
154
120
125
—
134
—
* Should be serviced by your dealer, unless the owner has proper tools and service data and is
mechanically qualified. Refer to the official Honda Service Manual (page 238).
104 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 105 Tuesday, April 3, 2018 11:37 AM
Maintenance Schedule
FREQUENCY
WHICHEVER
COMES FIRST
mi
km
MONTH
ITEMS
*
*
*
*
*
*
*
*
*
*
**
**
**
**
NOTE
DRIVETRAIN BOOTS
FRONT and REAR FINAL
GEAR OIL (Except
TRX420TM1)
REAR FINAL GEAR OIL
(TRX420TM1 only)
2WD/4WD SELECT SYSTEM
(Except TRX420TM1)
NOTE 3
BRAKE FLUID
BRAKE SHOES WEAR
NOTE 1, 2
BRAKE PADS WEAR
NOTE 1, 2
BRAKE LIGHT SWITCH
BRAKE SYSTEM
REVERSE LOCK SYSTEM
GUARDS
CLUTCH SYSTEM
SUSPENSION
SPARK ARRESTER
NUTS, BOLTS, FASTENERS
WHEELS/TIRES
TIE-ROD AND JOINT
BOOTS
STEERING SHAFT HOLDER
BEARINGS
STEERING SYSTEM
HOURS
INITIAL
REGULAR
MAINT.
MAINT. INTERVAL
100
150
1
20
600
1000
6
100
I
(R: EVERY
2 YEARS)
1200
2000
12
200
I
I
Refer to
page
(R: EVERY
2 YEARS)
I
129
I
—
I
I
I
I
I
I
I
I
I
C
I
I
I
159
167
162
168
159
150
177
149
156
155
—
170
—
I
—
I
—
I
I
I
I
I
I
I
I
I
I
I
I
I
I
C
I
I
179
129,
132
* Should be serviced by your dealer, unless the owner has proper tools and service data and is
mechanically qualified. Refer to the official Honda Service Manual (page 238).
** In the interest of safety, we recommend these items be serviced only by your dealer.
Servicing Your Honda 105
19 TRX420TM1 FM1_31HR3650.book Page 106 Tuesday, April 3, 2018 11:37 AM
Maintenance Record
Keeping an accurate maintenance record will help ensure that your
ATV is properly maintained. Retain detailed receipts to verify the
maintenance was performed. If the ATV is sold, these receipts should
be transferred with the ATV to the new owner. Make sure whoever
performs the maintenance completes this record. All scheduled
maintenance, including the 100 mile (150 km) or 1 month or 20
hours initial maintenance, is considered a normal owner operating
cost and will be charged for by your dealer. Use the space under
Notes to record anything you want to remind yourself about or
mention to your dealer.
Miles (km) or
ODO or
months or hours HOUR
100 (150) or
1 or 20
600 (1,000) or
6 or 100
1,200 (2,000) or
12 or 200
1,800 (3,000) or
18 or 300
2,400 (4,000) or
24 or 400
3,000 (5,000) or
30 or 500
3,600 (6,000) or
36 or 600
4,200 (7,000) or
42 or 700
4,800 (8,000) or
48 or 800
106 Servicing Your Honda
Date
Performed
By:
Notes
19 TRX420TM1 FM1_31HR3650.book Page 107 Tuesday, April 3, 2018 11:37 AM
Maintenance Component
Locations
Service Preparations
P/R lever
front brake fluid reservoir
front brake lever
reverse
assist lever
rear brake lever/
parking brake lever
fuel fill cap
throttle lever
Servicing Your Honda 107
19 TRX420TM1 FM1_31HR3650.book Page 108 Tuesday, April 3, 2018 11:37 AM
Maintenance Component
Locations
air cleaner
front suspension spring
pre-load adjuster
air cleaner housing
drain tube
rear brake light
switch
engine oil filter
front brake
caliper
rear brake pedal
front final gear oil fill cap (Except TRX420TM1)
front final gear oil drain bolt (Except TRX420TM1)
108 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 109 Tuesday, April 3, 2018 11:37 AM
Maintenance Component
Locations
owner’s manual
air pressure gauge
tool kit
battery
fuse box
main fuse 1
main fuse 2
coolant
reserve
tank
clutch
adjuster
engine oil
fill cap/
dipstick
spark plug
rear brake
panel
engine oil drain bolt
rear suspension spring
pre-load adjuster
spark arrester
rear final gear oil fill cap
rear final gear oil drain bolt
Servicing Your Honda 109
19 TRX420TM1 FM1_31HR3650.book Page 110 Tuesday, April 3, 2018 11:37 AM
Tool Kit
The tool kit (1) is stored under the rear fender cover (page 115).
After using the tools, be sure to use the rubber band (2) to fasten the
tool kit securely.
An optional, larger tool kit may be available. Check with your
dealer’s parts department.
UNDER REAR FENDER COVER
(2)
(1) tool kit
110 Servicing Your Honda
(1)
(2) rubber band
19 TRX420TM1 FM1_31HR3650.book Page 111 Tuesday, April 3, 2018 11:37 AM
Owner’s Manual Storage
Your ATV provides storage for the owner’s manual so you’ll have it
with you for easy reference. Store your owner’s manual (1) in the
plastic document bag underside of the rear fender cover (2).
The owner’s manual and air pressure gauge (3) should be stored in
the plastic document bag (4) and fastened with the rubber band (5).
To remove the rear fender cover, see page 115.
Be careful not to flood this area when washing your ATV.
REAR FENDER COVER UNDERSIDE
(4)
(5)
(2)
(3)
(1)
(1) owner’s manual
(3) air pressure gauge
(2) rear fender cover
(4) plastic document bag
(5) rubber band
Servicing Your Honda 111
19 TRX420TM1 FM1_31HR3650.book Page 112 Tuesday, April 3, 2018 11:37 AM
Seat Removal
Refer to Safety Precautions on page 101.
The seat must be removed for the air cleaner, engine oil filter, clutch,
spark plug, battery and fuse maintenance and to remove the rear
fender cover and tank cover assembly, to access the owner’s
manual, air pressure gauge, tool kit.
(3) (2)
(4)
(1) seat latch
(2) seat
(3) front prongs
(5)
(1)
(6)
(4) hooks
(5) studs
(6) grommets
Removal
1. Pull the seat latch (1) at the rear of the seat.
2. Slide the seat (2) back and lift it.
Installation
1. Insert the front prongs (3) into the hooks (4) on the frame and
press the studs (5) into the grommets (6).
2. Press down on the seat until locks.
112 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 113 Tuesday, April 3, 2018 11:37 AM
Tank Cover Assembly Removal
Refer to Safety Precautions on page 101.
The tank cover assembly must be removed for the engine oil filter,
spark plug and clutch maintenance.
RIGHT SIDE
(1)
(3)
(1)
(2)
(2)
(5)
(1) prongs
(2) grommets
(3) tank cover assembly
(2)
(4)
(4) tabs A
(5) tabs B
Removal
1. Remove the seat (page 112).
2. Remove the prongs (1) from the grommets (2).
3. Remove the tank cover assembly (3) by releasing the tabs A (4)
and tabs B (5).
Servicing Your Honda 113
19 TRX420TM1 FM1_31HR3650.book Page 114 Tuesday, April 3, 2018 11:37 AM
Tank Cover Assembly Removal
LEFT SIDE
(4)
(1)
(1)
(2)
(2)
(5)
(1) prongs
(2) grommets
(3) tank cover assembly
(3)
(2)
(4) tabs A
(5) tabs B
Installation
Install the parts in the reverse order of removal.
Make sure that all prongs and tabs are installed securely in position.
114 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 115 Tuesday, April 3, 2018 11:37 AM
Rear Fender Cover Removal
Refer to Safety Precautions on page 101.
The rear fender cover must be removed for battery, fuse
maintenance and to access the owner’s manual, air pressure gauge
and tool kit.
(2)
(5)
(1)
(4)
(3)
(1) rubber strap
(2) prongs
(3) grommets
(4) rear fender cover
(5) tabs
Removal
1. Remove the seat (page 112).
2. Unhook the rubber strap (1) with opening the storage
compartment (page 46).
3. Firmly pull the prongs (2) from their grommets (3).
4. Slide the rear fender cover (4) forward to disengage the tabs (5).
5. Remove the rear fender cover.
Installation
Install the parts in the reverse order of removal.
Servicing Your Honda 115
19 TRX420TM1 FM1_31HR3650.book Page 116 Tuesday, April 3, 2018 11:37 AM
Clip Removal
Removal
1. Pull up the center pin to release the lock.
2. Pull out the clip of the hole.
1.
2.
Installation
1. Insert the clip into the hole.
2. Press down the center pin securely to lock the clip.
1.
116 Servicing Your Honda
2.
19 TRX420TM1 FM1_31HR3650.book Page 117 Tuesday, April 3, 2018 11:37 AM
Service&Procedures
Fluids
Filters
Fuel
Refer to Safety Precautions on page 101.
Fuel Recommendation
type
pump octane number
unleaded
86 (or higher)
Use only unleaded fuel in your Honda. If you ride your Honda in a
country where leaded fuel might be available, take precautions to
use only unleaded fuel.
Your engine is designed to use any unleaded gasoline that has a
pump octane number of 86 or higher. Gasoline pumps at service
stations normally display the pump octane number. For information
on the use of oxygenated fuels, see page 235.
Use of lower octane gasoline can cause persistent “pinging” or
“spark knock” (a loud rapping noise) which, if severe, can lead to
engine damage. Light pinging experienced while operating under a
heavy load, such as climbing a hill, is no cause for concern.
If pinging or spark knock occurs at a steady engine speed under
normal load, change brands of gasoline. If pinging or spark knock
persists, consult your dealer.
Never use stale or contaminated gasoline or an oil/gasoline mixture.
Avoid getting dirt, dust, or water in the fuel tank.
Servicing Your Honda 117
19 TRX420TM1 FM1_31HR3650.book Page 118 Tuesday, April 3, 2018 11:37 AM
Fuel
Fuel Capacity
Fuel tank capacity, including reserve:
3.88 US gal (14.7 ℓ)
Reserve capacity:
1.29 US gal (4.9 ℓ)
TRX420FM1:
When there is only one segment left in the fuel gauge (page 25), fuel
will be low and you should refuel as soon as possible.
TRX420TM1:
The tank should be refilled as soon as possible when the fuel
warning indicator comes on.
Refueling Procedure
Refer to Safety Precautions on page 101.
(2)
(1)
(1) fuel fill cap
(2) bottom of the filler neck
118 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 119 Tuesday, April 3, 2018 11:37 AM
Fuel
1. To open the fuel fill cap (1), turn it counterclockwise.
2. Add fuel until the level reaches the bottom of the filler neck (2).
Avoid over filling the tank. There should be no fuel in the filler
neck.
WARNING
3 WARNING
Gasoline is highly flammable and explosive.
You can be burned or seriously injured when
handling fuel.
• Stop the engine and keep heat, sparks and
flame away.
• Handle fuel only outdoors.
• Wipe up spills immediately.
3. After refueling, turn the fuel fill cap clockwise securely.
If you replace the fuel fill cap, use a Honda Genuine replacement
part or equivalent.
NOTICE
Do not allow spilled gasoline to pool on camouflage colored
bodywork. Also do not allow gasoline soaked rags to be placed on
camouflage bodywork. Gasoline can damage the camouflage
coating.
Servicing Your Honda 119
19 TRX420TM1 FM1_31HR3650.book Page 120 Tuesday, April 3, 2018 11:37 AM
Engine Oil & Filter
Engine oil quality is a major factor that affects both the performance
and the service life of the engine.
Using the proper oil (page 121) and filter, and regularly checking,
adding, and changing oil will help extend your engine’s life. Even the
best oil wears out. Changing oil helps get rid of dirt and deposits in
the engine. Operating the engine with old or dirty oil can damage
your engine. Running the engine with insufficient oil can cause
serious damage to the engine and transmission.
Change the engine oil as specified in the maintenance schedule on
page 104. When running in very dusty conditions, oil changes
should be performed more frequently than specified in the
maintenance schedule.
120 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 121 Tuesday, April 3, 2018 11:37 AM
Engine Oil & Filter
Oil Recommendation
API classification
viscosity (weight)
JASO T 903
standard
suggested oil*
SG or higher except oils labeled as
energy conserving or resource
conserving on the circular API
service label
SAE 10W-30
MA
Pro Honda GN4 4-stroke oil (USA &
Canada), or Honda 4-stroke oil, or
an equivalent motorcycle oil.
* Suggested oils are equal in performance to SJ oils that are not
labeled as energy conserving or resource conserving on the
circular API service label.
• Your ATV does not need oil additives. Use the recommended oil.
• Do not use oils with graphite or molybdenum additives. They may
adversely affect clutch operation.
• Do not use API SH or higher oils displaying a circular API “energy
conserving” or “resource conserving” service label on the
container. They may affect lubrication and clutch performance.
NOT RECOMMENDED
RECOMMENDED
• Do not use non-detergent, vegetable, or castor based racing oils.
Servicing Your Honda 121
19 TRX420TM1 FM1_31HR3650.book Page 122 Tuesday, April 3, 2018 11:37 AM
Engine Oil & Filter
Other viscosities shown in the following chart may be used when the
average temperature in your riding area is within the indicated
range.
JASO T 903 standard
The JASO T 903 standard is an index for engine oils for 4-stroke
motorcycle engines.
There are two classes: MA and MB.
Oil conforming to the standard is labeled on the oil container. For
example, the following label shows the MA classification.
(1)
(2)
(1) oil code
(2) oil classification
122 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 123 Tuesday, April 3, 2018 11:37 AM
Engine Oil & Filter
Checking & Adding Oil
Refer to Safety Precautions on page 101.
Check the engine oil level each day before operating your ATV and
add if needed.
The oil fill cap/dipstick is located at the front left crankcase.
Before riding your ATV, check the engine oil level.
1. Park your ATV on a firm, level surface.
2. Start the engine in a well-ventilated area and let it idle for 3 – 5
minutes. If the air temperature is below 10°C (50°F), let the
engine idle for an additional 5 minutes (a total of 10 minutes).
3. Stop the engine and wait 2 – 3 minutes.
4. Remove the oil check lid (1).
LEFT SIDE
(1)
(1) oil check lid
(cont’d)
Servicing Your Honda 123
19 TRX420TM1 FM1_31HR3650.book Page 124 Tuesday, April 3, 2018 11:37 AM
Engine Oil & Filter
5. Remove the oil fill cap/dipstick (2) from the front crankcase and
wipe it clean.
6. Insert the oil fill cap/dipstick without screwing it in, then remove
the oil fill cap/dipstick and check the oil level. The oil level should
be between the upper level mark (3) and the lower level mark (4)
on the oil fill cap/dipstick.
7. If the oil level is near or below the lower level mark, then add the
specified oil into the fill cap hole, up to the upper level mark on
the oil fill cap/dipstick. Do not overfill.
8. Reinstall the oil fill cap/dipstick.
9. Install the oil check lid.
NOTICE
Running the engine with an improper oil level can cause serious
engine damage.
LEFT SIDE
(2)
(3)
(4)
(2) oil fill cap/dipstick
124 Servicing Your Honda
(3) upper level mark
(4) lower level mark
19 TRX420TM1 FM1_31HR3650.book Page 125 Tuesday, April 3, 2018 11:37 AM
Engine Oil & Filter
Changing Engine Oil & Filter
Refer to Safety Precautions on page 101.
Your ATV’s oil filter has very specific performance requirements. Use
a new Honda Genuine oil filter specified for your model or a filter of
equal quality.
NOTICE
Using the wrong oil filter may result in leaks or engine damage.
This procedure requires mechanical skill and professional tools such
as a torque wrench as well as a means for disposing of the drained
fluid (page 200). If you do not have the skills or the tools, see your
dealer.
Change the oil with the engine warm to assure complete and rapid
draining.
Drain the Engine Oil:
1. With the ATV on level ground, remove the oil check lid
(page 123) and the oil fill cap/dipstick from the front crankcase.
(cont’d)
Servicing Your Honda 125
19 TRX420TM1 FM1_31HR3650.book Page 126 Tuesday, April 3, 2018 11:37 AM
Engine Oil & Filter
2. Place an oil drain pan under the crankcase and remove the
engine oil drain bolt (1) and sealing washer (2).
UNDER ENGINE
(2)
(1)
(1) engine oil drain bolt
(2) sealing washer
Install a New Engine Oil Filter:
Place shop towels under the oil filter cover because oil will flow out.
1. Remove the seat (page 112).
2. Remove the tank cover assembly (page 113).
126 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 127 Tuesday, April 3, 2018 11:37 AM
Engine Oil & Filter
3. Remove the oil filter cover (1) and O-rings (2) by removing the
bolts (3). Let the remaining oil drain out. Discard the oil filter (4)
in an approved manner (page 200).
4. Apply engine oil to a new O-rings and install them to the oil filter
cover and crankcase cover. Then install a new oil filter. Use only
the Honda Genuine oil filter or a filter of equivalent quality
specified for your model. Using the wrong Honda filter or a nonHonda filter which is not of equivalent quality may cause engine
damage.
5. Reposition the spring (5) to the engine crankcase and install a
new oil filter with the rubber seal (6) facing out, away from the
engine. You will see the “OUTSIDE (TOWARDS FILTER COVER)”
mark (7) on the filter body, near the seal.
NOTICE
Improper installation of the oil filter can cause serious engine
damage.
RIGHT SIDE
(1)
(2)
(6)
(1)
(5)
(4)
(7)
(2)
(3)
(1) oil filter cover
(5) spring
(2) O-rings
(6) rubber seal
(3) bolts
(7) “OUTSIDE” mark
(4) oil filter
Servicing Your Honda 127
19 TRX420TM1 FM1_31HR3650.book Page 128 Tuesday, April 3, 2018 11:37 AM
Engine Oil & Filter
6. Reinstall the oil filter cover, making sure the bolts are tightened
to the specified torque:
7 lbf·ft (10 N·m , 1.0 kgf·m)
7. Pour the drained oil into a suitable container and dispose of it in
an approved manner (page 200).
NOTICE
Improper disposal of drained fluids is harmful to the environment.
Add Engine Oil:
1. Reinstall the oil drain bolt with the new sealing washer and
tighten it to the specified torque:
18 lbf·ft (25 N·m , 2.5 kgf·m)
2. Fill the crankcase with the recommended grade oil
approximately:
2.9 US qt (2.7 ℓ)
3. Reinstall the oil fill cap/dipstick.
4. Start the engine and let it idle for 3 – 5 minutes.
5. Stop the engine, wait 2 – 3 minutes and check the oil level. Make
sure the oil is between the upper and lower level marks on the oil
fill cap/dipstick. If necessary, add more oil but do not overfill.
6. Check that there are no oil leaks.
7. Install the tank cover assembly.
8. Install the seat.
9. Install the oil check lid.
If a torque wrench is not used for installation, see your dealer as
soon as possible to verify proper assembly.
128 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 129 Tuesday, April 3, 2018 11:37 AM
Rear Final Gear Oil
Oil Recommendation
type
viscosity (weight)
suggested oil
hypoid gear oil
SAE 80W-90
Honda shaft drive oil or equivalent
Changing Oil
Refer to Safety Precautions on page 101.
Change the oil with the rear final gear at normal operating
temperature to assure complete and rapid draining.
Servicing Your Honda 129
19 TRX420TM1 FM1_31HR3650.book Page 130 Tuesday, April 3, 2018 11:37 AM
Rear Final Gear Oil
1. Park your ATV on a firm, level surface.
REAR
(2)
(1)
(1) oil drain bolt
(2) oil fill cap
2. Place an oil drain pan under the oil drain bolt (1).
3. Remove the oil fill cap (2), O-ring, drain bolt and sealing washer.
4. After the oil has completely drained, reinstall the drain bolt with
a new sealing washer and tighten it to the specified torque:
9 lbf·ft (12 N·m , 1.2 kgf·m)
5. Remove the oil level check bolt (3) and sealing washer.
130 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 131 Tuesday, April 3, 2018 11:37 AM
Rear Final Gear Oil
6. Slowly fill the rear final gear with the recommended oil until oil
start to flow out of the oil level check hole (4). Allow oil to settle
for 2 – 3 minutes before moving to next step to prevent overfilling.
2.9 US oz (85 cm3)
7. Coat a new O-ring with grease and install it into the fill cap
groove and tighten it to the specified torque:
9 lbf·ft (12 N·m , 1.2 kgf·m)
8. Install the oil level check bolt with a new sealing washer and
tighten it to the specified torque:
9 lbf·ft (12 N·m , 1.2 kgf·m)
9. Pour the drained oil into a suitable container and dispose of it in
an approved manner (page 200).
NOTICE
Improper disposal of drained fluids is harmful to the environment.
REAR
(4)
(3)
(3) oil level check bolt
(4) oil level check hole
Servicing Your Honda 131
19 TRX420TM1 FM1_31HR3650.book Page 132 Tuesday, April 3, 2018 11:37 AM
Front Final Gear Oil (Except
TRX420TM1)
Oil Recommendation
type
viscosity (weight)
suggested oil
hypoid gear oil
SAE 80W-90
Honda shaft drive oil or equivalent
Changing Oil
Refer to Safety Precautions on page 101.
Change the oil with the front final gear at normal operating
temperature to assure complete and rapid draining.
132 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 133 Tuesday, April 3, 2018 11:37 AM
Front Final Gear Oil (Except
TRX420TM1)
1. Park your ATV on a firm, level surface.
2. Place an oil drain pan under the oil drain bolt (1).
3. Remove the oil fill cap (2), O-ring, drain bolt and sealing washer.
4. After the oil has completely drained, reinstall the drain bolt with
a new sealing washer and tighten it to the specified torque:
9 lbf·ft (12 N·m , 1.2 kgf·m)
5. Pour the drained oil into a suitable container and dispose of it in
an approved manner (page 200).
NOTICE
Improper disposal of drained fluids is harmful to the environment.
6. Fill the front final gear with the recommended oil.
7.1 US oz (210 cm3)
Make sure the oil level is at the lower edge of the oil fill inspection
hole (3).
7. Coat a new O-ring with grease and install it into the fill cap
groove and tighten it to the specified torque:
9 lbf·ft (12 N·m , 1.2 kgf·m)
FRONT
(2)
(3)
(1)
(1) oil drain bolt
(2) oil fill cap
(3) oil fill inspection hole
Servicing Your Honda 133
19 TRX420TM1 FM1_31HR3650.book Page 134 Tuesday, April 3, 2018 11:37 AM
Coolant
Your ATV’s liquid cooling system dissipates engine heat through the
coolant jacket that surrounds the cylinder and cylinder head.
Maintaining the coolant will allow the cooling system to work
properly and prevent freezing, overheating, and corrosion.
Coolant Recommendation
Use Pro Honda HP Coolant or an equivalent high quality ethylene
glycol antifreeze containing corrosion protection inhibitors
specifically recommended for use in aluminum engines. Check the
antifreeze container label.
Use only distilled water as a part of the coolant solution. Water that
is high in mineral content or salt may be harmful to the aluminum
engine.
NOTICE
Using coolant with silicate inhibitors may cause premature wear of
water pump seals or blockage of radiator passages. Using tap water
may cause engine damage.
The factory provides a 50/50 solution of antifreeze and water in this
ATV. This coolant solution is recommended for most operating
temperatures and provides good corrosion protection.
Decreasing the concentration of antifreeze to less than 40% will not
provide proper corrosion protection.
134 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 135 Tuesday, April 3, 2018 11:37 AM
Coolant
Increasing the concentration of antifreeze is not recommended
because it decreases cooling system performance. Higher
concentrations of antifreeze (up to 60%) should only be used to
provide additional protection against freezing. Check the cooling
system frequently during freezing weather.
Checking & Adding Coolant
Refer to Safety Precautions on page 101.
Check the engine coolant level each day before operating your ATV
and add if needed.
LEFT FRONT
(1)
(2)
(3)
(1) reserve tank
(2) UPPER level mark
(3) LOWER level mark
1. Make sure the vehicle is on level ground.
2. With the engine at normal operating temperature, check the
coolant level in the reserve tank (1). It should be between the
UPPER (2) and LOWER (3) level marks.
If the reserve tank is empty, or if coolant loss is excessive, check
for leaks and see your dealer for repair.
Servicing Your Honda 135
19 TRX420TM1 FM1_31HR3650.book Page 136 Tuesday, April 3, 2018 11:37 AM
Coolant
3. Remove the radiator cap lid (4) and reserve tank cap (5).
Always add coolant to the reserve tank. Do not attempt to add
coolant by removing the radiator cap.
4. Add coolant to the reserve tank as required to bring the coolant
level to the UPPER level mark.
(4)
FRONT
(5)
(4) radiator cap lid
(5) reserve tank cap
5. After adding coolant, install the parts in the reverse order of
removal.
136 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 137 Tuesday, April 3, 2018 11:37 AM
Coolant
Coolant Replacement
Refer to Safety Precautions on page 101.
Coolant should be replaced by your dealer, unless you have the
proper tools and service data, and are mechanically qualified. Refer
to the official Honda Service Manual (page 238).
WARNING
3 WARNING
Removing the radiator cap while the engine is
hot can cause the coolant to spray out,
seriously scalding you.
Always let the engine and radiator cool down
before removing the radiator cap.
To properly dispose of drained coolant, refer to You & the
Environment, page 200.
NOTICE
Improper disposal of drained fluids is harmful to the environment.
Servicing Your Honda 137
19 TRX420TM1 FM1_31HR3650.book Page 138 Tuesday, April 3, 2018 11:37 AM
Coolant
Radiator Core
Refer to Safety Precautions on page 101.
Check the air passages for clogging or damage. Remove insects,
mud, or any obstruction with low water pressure. Have the radiator
checked by your dealer if the air flow is restricted over more than
20% of the radiator surface.
Clean the radiator core after riding the ATV in mud.
To clean the radiator core and radiator grill cover:
1. Unhook the reserve tank tube (1).
2. Remove the reserve tank (2) from the left radiator grill cover (3)
by removing the bolt (4) and clip (5).
3. Remove the clips (6).
4. Unhook the tab A (7) and tab B (8) on both of the left and right
side.
5. Unhook the left side of the center radiator grill cover hook (9) and
slide the left radiator grill cover.
6. Remove the left radiator grill cover.
NOTICE
Do not apply pressured water directly to the radiator core.
The pressured water can damage the radiator core.
138 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 139 Tuesday, April 3, 2018 11:37 AM
Coolant
LEFT FRONT
(9)
(6)
(2)
(8)
(3)
(1)
(7)
(1) reserve tank tube
(2) reserve tank
(3) left radiator grill cover
(4) bolt
(5) clip
(6)
(5)
(4)
(6) clips
(7) tab A
(8) tab B
(9) center radiator grill cover
hook
Servicing Your Honda 139
19 TRX420TM1 FM1_31HR3650.book Page 140 Tuesday, April 3, 2018 11:37 AM
Coolant
RIGHT FRONT
(7)
(8)
(7) tab A
(8) tab B
7. Remove the center radiator grill cover (10) by unhooking the right
side of the center radiator grill cover hook (11).
8. Wash the radiator core (12) and center radiator grill cover.
LEFT FRONT
(10)
(11)
(12)
(10) center radiator
grill cover
(11) center radiator grill cover hook
(12) radiator core
9. Install the removed parts in reverse order of removal.
140 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 141 Tuesday, April 3, 2018 11:37 AM
Air Cleaner
Refer to Safety Precautions on page 101.
Proper air cleaner maintenance is very important for off-road
vehicles.
A dirty, water-soaked, worn-out, or defective air cleaner will allow
dirt, dust, mud, and other impurities to pass into the engine.
Service the air cleaner more frequently if you ride in unusually wet or
dusty areas. Your dealer can help you determine the correct service
interval for your riding conditions.
Your ATV’s air cleaner has very specific performance requirements.
Use a new Honda Genuine air cleaner specified for your model or an
air cleaner of equal quality.
NOTICE
Using the wrong air cleaner may result in premature engine wear.
Proper air cleaner maintenance can prevent premature engine wear
or damage, expensive repairs, low engine power, poor gas mileage,
and spark plug fouling.
NOTICE
Improper or lack of proper air cleaner maintenance can cause poor
performance and premature engine wear.
Servicing Your Honda 141
19 TRX420TM1 FM1_31HR3650.book Page 142 Tuesday, April 3, 2018 11:37 AM
Air Cleaner
Cleaning
1. Remove the seat (page 112).
UNDER SEAT
(1)
(2)
(1) retainer clips
(2) air cleaner housing cover
2. Unlatch the retainer clips (1).
3. Remove the air cleaner housing cover (2).
142 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 143 Tuesday, April 3, 2018 11:37 AM
Air Cleaner
4. Loosen the screw (3) and remove the air cleaner assembly (4)
from the air cleaner housing.
5. Remove the clamp (5).
6. Remove the air cleaner (6) from the air cleaner body (7).
7. Gently wash the air cleaner in clean, non-flammable (high flash
point) solvent such as kerosene — not gasoline. After cleaning,
gently squeeze out the remaining solvent. Avoid twisting or
wringing the air cleaner. This can tear the foam.
8. Inspect for tears or cracks in the foam or seams of the air cleaner.
Replace the air cleaner if it is damaged.
9. Allow the air cleaner to dry thoroughly before applying oil. A wet
air cleaner will not fully absorb the oil.
10. Pour clean Pro Honda Foam Filter Oil or an equivalent (Canada:
Honda Foam Filter Oil or an equivalent) over the entire surface of
the air cleaner. Use both hands to evenly spread the oil into the
air cleaner. Gently squeeze out any excess oil. (To keep your
hands dry, place the air cleaner in a clean plastic bag before
spreading the oil into the air cleaner.)
UNDER SEAT
(7)
(4)
(3)
(5)
(6)
(3) screw
(4) air cleaner assembly
(5) clamp
(6) air cleaner
(7) air cleaner body
(cont’d)
Servicing Your Honda 143
19 TRX420TM1 FM1_31HR3650.book Page 144 Tuesday, April 3, 2018 11:37 AM
Air Cleaner
11. Install the air cleaner on the air cleaner body.
12. Apply a thin coat of grease to the sealing surface of the air
cleaner assembly.
13. Install the clamp.
14. Insert the air cleaner assembly into the air cleaner housing.
15. Fasten the screw.
16. Reassemble by reversing the disassembly sequence.
• Install the air cleaner housing cover and fit the cut out of the
tab (8) at the end of the air cleaner.
UNDER SEAT
(8)
(8) tab
144 Servicing Your Honda
(8)
19 TRX420TM1 FM1_31HR3650.book Page 145 Tuesday, April 3, 2018 11:37 AM
Air Cleaner
Dust Cover
UNDER SEAT
(1)
(2)
(1) dust cover
(2) breather joint
Do not push the dust cover (1) too far into the breather joint (2).
If the dust cover is dirty, clean it.
Servicing Your Honda 145
19 TRX420TM1 FM1_31HR3650.book Page 146 Tuesday, April 3, 2018 11:37 AM
Air Cleaner
Air Cleaner Housing Drain Tube
The air cleaner housing drain tube should be serviced in accordance
with the Maintenance Schedule. (Riding through water may require
more frequent inspection.) If deposits can be seen in the drain tube,
the tube must be cleaned before starting the vehicle.
REAR
(2)
(1)
(1) drain tube
(3)
(3) air cleaner housing
(2) clip
1. Remove the drain tube (1) by removing the clip (2) under the air
cleaner housing (3).
2. Drain the deposits.
3. Reinstall the drain tube, securing it with the clip.
146 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 147 Tuesday, April 3, 2018 11:37 AM
Engine
Throttle
Throttle Freeplay
Refer to Safety Precautions on page 101.
RIGHT HANDLEBAR
(A)
(B)
(2)
(3)
(4)
1/8 – 5/16 in
(3 – 8 mm)
(1)
(1) throttle lever
(2) rubber sleeve
(3) throttle cable adjuster
(4) lock nut
(A) decrease freeplay
(B) increase freeplay
Inspection
Check freeplay at the throttle lever (1).
Freeplay:
1/8 – 5/16 in (3 – 8 mm)
Adjustment
1. Slide the rubber sleeve (2) back to expose the throttle cable
adjuster (3).
2. Loosen the lock nut (4).
3. Turn the adjuster to obtain the correct freeplay.
4. Tighten the lock nut and reinstall the sleeve.
5. After adjustment, check for smooth operation of the throttle
lever from fully closed to fully open in all steering positions.
Servicing Your Honda 147
19 TRX420TM1 FM1_31HR3650.book Page 148 Tuesday, April 3, 2018 11:37 AM
Throttle
Throttle Inspection
Refer to Safety Precautions on page 101.
1. Check that the throttle assembly is positioned properly and the
securing bolts are tight.
2. Check for smooth operation of the throttle lever from fully open
to fully closed in all steering positions. If there is a problem, see
your dealer.
3. Inspect the condition of the throttle cable from the throttle lever
down to the throttle body. If the cable is kinked or chafed, have
it replaced.
4. Check the throttle cable for tension or stress in all steering
positions.
5. Lubricate the throttle cable with a commercially available cable
lubricant to prevent premature wear and corrosion.
148 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 149 Tuesday, April 3, 2018 11:37 AM
Clutch System
Your ATV’s shift-activated, wet, multiplate clutch is part of the
primary drive system. Proper adjustment allows a smooth, gradual
engagement when shifting gears.
Clutch Adjustment
Refer to Safety Precautions on page 101.
LEFT FRONT
(1)
(2)
(1) lock nut
(2) clutch adjuster
1. Make sure the engine is cool.
2. Make sure the ignition switch is OFF (w).
3. Remove the seat (page 112) and tank cover assembly (page 113).
4. Loosen the lock nut (1).
5. Turn the clutch adjuster (2) counterclockwise until you feel slight
resistance.
6. Turn the adjuster 1/4 turn clockwise, then tighten the lock nut to
hold the adjuster in this position.
7. After adjustment, start the engine and test ride your ATV to be
sure the clutch is operating properly.
8. Install the removed parts in reverse order of removal.
If you cannot get proper adjustment, or the clutch does not work
properly, the clutch friction discs may be worn. See your dealer or
refer to official Honda Service Manual (page 238).
Servicing Your Honda 149
19 TRX420TM1 FM1_31HR3650.book Page 150 Tuesday, April 3, 2018 11:37 AM
Reverse Lock System
Reverse Lock System Adjustment
Refer to Safety Precautions on page 101.
LEFT HANDLEBAR
(1)
(5)
(3)
(4)
(1) dust cover
(2) reverse assist lever
(3) rubber sleeve
1/16 – 3/16 in
(2 – 4 mm)
(2)
(4) lock nut
(5) adjusting nut
1. Turn over the dust cover (1).
2. Check the reverse assist lever (2) freeplay, measured at the
reverse assist lever end near the cable:
1/16 – 3/16 in (2 – 4 mm)
3. To adjust, slide the rubber sleeve (3), loosen the lock nut (4) and
turn the adjusting nut (5) to obtain the correct freeplay.
After adjustment, tighten the lock nut securely.
4. Return the dust cover and rubber sleeve.
Other Checks
Check the reverse assist lever and cable for loose connections or
other damage. If the cable is worn or kinked, have it replaced by
your dealer.
150 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 151 Tuesday, April 3, 2018 11:37 AM
Spark Plug
Spark Plug Recommendation
standard spark plug
BKR5E-11 (NGK) or
K16PR-U11 (DENSO)
Use only the recommended type of spark plug in the recommended
heat range.
NOTICE
Using spark plugs with an improper heat range can cause engine
damage.
Spark Plug Inspection & Replacement
Refer to Safety Precautions on page 101.
1. Remove the seat (page 112) and tank cover assembly (page 113).
2. Clean any dirt from around the spark plug base.
3. Disconnect the spark plug cap (1). Take care to avoid damaging
the spark plug wire when disconnecting the cap.
4. Using a spark plug wrench provided in the tool kit, remove the
spark plug.
5. Inspect the electrodes and center porcelain for deposits,
corrosion, or carbon fouling. If the corrosion or deposits are
heavy, replace the plug. Clean a carbon or wet-fouled plug with
a plug cleaner, if available, or a wire brush. Inspect the spark plug
electrodes for wear. The center electrode (2) should have a flat tip
and sharp edges, and the side electrode (3) should not be eroded.
If the electrodes and insulator tip appear unusually fouled or
burned, we suggest that you contact your dealer.
6. Discard the spark plug if there is apparent wear or if the insulator
is cracked or chipped.
Servicing Your Honda 151
19 TRX420TM1 FM1_31HR3650.book Page 152 Tuesday, April 3, 2018 11:37 AM
Spark Plug
7. Using a wire-type feeler gauge, check the spark plug gap (4). If
adjustment is necessary, bend the side electrode carefully.
The gap should be:
0.039 – 0.043 in (1.00 – 1.10 mm)
LEFT SIDE
(4)
0.039 – 0.043 in
(1.00 – 1.10 mm)
(3)
(2)
(1)
(1) spark plug cap
(2) center electrode
(3) side electrode
(4) spark plug gap
8. With the plug washer attached, thread the spark plug in by hand
to prevent cross-threading.
9. Tighten the spark plug:
• If the old plug is good:
1/8 turn after it seats.
• If installing a new plug, tighten it twice to prevent loosening:
a) First, tighten the plug:
NGK:
3/4 turn after it seats.
DENSO: 1/2 turn after it seats.
b) Then loosen the plug.
c) Next, tighten the plug again:
1/8 turn after it seats.
152 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 153 Tuesday, April 3, 2018 11:37 AM
Spark Plug
NOTICE
An improperly tightened spark plug can damage the engine. If a
plug is too loose, the piston may be damaged. If a plug is too tight,
the threads may be damaged.
10. Connect the spark plug cap. Take care to avoid pinching any
cables or wires.
11. Install the remaining parts in the reverse order of removal.
Servicing Your Honda 153
19 TRX420TM1 FM1_31HR3650.book Page 154 Tuesday, April 3, 2018 11:37 AM
Valves
Valve Inspection
Refer to Safety Precautions on page 101.
Valve clearance should be:
intake: 0.006 in (0.15 mm)
exhaust: 0.009 in (0.23 mm)
Excessive clearance will cause noise. Insufficient clearance will cause
loss of power and possibly damage the valves.
For those who are mechanically proficient and have the proper tools,
instructions on adjusting valve clearances are given in the official
Honda Service Manual. Otherwise, the valves should be adjusted by
your dealer.
154 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 155 Tuesday, April 3, 2018 11:37 AM
Spark Arrester
Refer to Safety Precautions on page 101.
The spark arrester must be serviced every 100 operating hours to
maintain its efficiency.
Regular servicing prevents carbon build up (which can diminish
engine performance) and also complies with USDA regulations for
regular maintenance to assure proper function. The spark arrester
prevents random sparks from the combustion process in your engine
from reaching the environment.
The use of safety glasses is recommended for this procedure.
Because of the possible fire hazard, check that there are no
combustible materials in the area before purging the spark arrester.
REAR
(1)
(1) bolt
1. Select a well-ventilated area free of combustible materials and
make sure the exhaust pipe is cool.
2. Remove the bolt (1).
3. Start the engine and rev it up approximately twenty times while
momentarily creating exhaust system back pressure by blocking
the end of the muffler with a shop towel.
4. Stop the engine and allow the exhaust pipe to cool.
5. Reinstall the bolt securely.
Servicing Your Honda 155
19 TRX420TM1 FM1_31HR3650.book Page 156 Tuesday, April 3, 2018 11:37 AM
Chassis
Suspension
Your front and rear suspension systems use springs and hydraulic
damping devices that suspend your weight and most of the weight
of your ATV.
The oil damper systems hydraulically control the natural compression
and rebound of the suspension springs so that traction and comfort
are maintained as the wheels ride over rough terrain.
The spring pre-loads for your front and rear suspension systems
adjust the amount of force required to begin compression of the
spring.
Consider adjusting your suspensions pre-load whenever you change
your normal load, by adding or subtracting cargo, accessories, or
when riding conditions change.
The way you ride your ATV and the type of ride you want to
experience can also influence your suspension needs.
Lower spring pre-load provides a softer ride and is usually preferred
for light loads and smooth terrain. Higher spring pre-load provides a
firmer ride and is recommended for heavy loads and rough terrain.
Suspension Adjustment
Using a pin spanner, which is available from your dealer, the
suspensions can be adjusted for rider weight and riding conditions
by changing the spring pre-load.
Do not attempt to disassemble, service, or dispose of the damper;
see your dealer. The instructions found in this owner’s manual are
limited to adjustments of the shock assembly only.
156 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 157 Tuesday, April 3, 2018 11:37 AM
Suspension
Suspension Spring Pre-Load
Refer to Safety Precautions on page 101.
FRONT
REAR
(1)
(1)
1 2 3 4 5
(2)
(2)
1 2 3 4 5
(1) spring pre-load adjuster
(2) pin spanner
The spring pre-load adjuster (1) has 5 positions for different load or
riding conditions.
Use the pin spanner (2) to adjust the shock spring pre-load.
Servicing Your Honda 157
19 TRX420TM1 FM1_31HR3650.book Page 158 Tuesday, April 3, 2018 11:37 AM
Suspension
Position 1: for a light load and smooth terrain.
Position 2: standard position.
Positions 3 to 5: for when the ATV is more heavily loaded. (Also
increase spring pre-load for stiffer suspension.)
Make sure that both front shock absorbers are adjusted to the same
position.
Always adjust the shock absorber position in sequence (1-2-3-4-5 or
5-4-3-2-1). Attempting to adjust directly from 1 to 5 or 5 to 1 may
damage the shock absorber.
158 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 159 Tuesday, April 3, 2018 11:37 AM
Brakes
The hydraulic disc brakes (front) and single mechanical drum brake
(rear) on your ATV dissipate heat generated by the friction of the
brake pads on the discs (front) and the brake shoes on the drum
(rear) as the wheels are slowed.
Hydraulic Disc Front Brake
As the front brake pads wear, brake fluid level will drop. A leak in the
system will also cause the level to drop.
There are no adjustments to perform, but fluid level and pad wear
must be inspected periodically. The system must be inspected
frequently to ensure there are no fluid leaks.
If the right brake lever freeplay does not feel within the normal range
while riding, check the brake pads for wear (page 162).
Worn pads should be replaced. If the pads are not worn beyond the
recommended limit, there is probably air in the brake system. See
your dealer to have the air bled from the system.
Mechanical Drum Rear Brake
If the rear brake lever/parking brake lever or brake pedal freeplay
does not feel within the normal range while riding, check the brake
shoes for wear (page 167).
Brake Fluid Recommendation
brake fluid
Honda DOT 4 Brake Fluid
The recommended brake fluid is Honda DOT 4 Brake Fluid, or any
brake fluid of equal quality and performance. Use fresh brake fluid
from a sealed container. Be sure to read the label before opening the
sealed container. An opened container may be contaminated or may
have absorbed moisture from the air.
Servicing Your Honda 159
19 TRX420TM1 FM1_31HR3650.book Page 160 Tuesday, April 3, 2018 11:37 AM
Brakes
Fluid Level Inspection
Refer to Safety Precautions on page 101.
If your inspection indicates a low fluid level, have your dealer add the
recommended fluid.
Do not add or replace brake fluid, except in an emergency. If you do
add fluid, have your dealer check the system as soon as possible.
NOTICE
Brake fluid can damage plastic and painted surfaces. Handle with
care.
Wipe up spills immediately. Avoid brake fluid contact with skin or
eyes. If it comes in contact with your eyes, wash them out with clean
water and immediately call a doctor. If it comes in contact with your
skin, wash with clean water and, if necessary, call a doctor.
RIGHT HANDLEBAR
(1)
(1) LOWER level mark
160 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 161 Tuesday, April 3, 2018 11:37 AM
Brakes
With the ATV on a level surface, check the fluid level.
It should be above the LOWER level mark (1). If the level is at or
below the LOWER level mark, check the brake pads for wear
(page 162).
Worn brake pads should be replaced. If the pads are not worn, have
your brake system inspected for leaks.
Other Inspections
• Make sure there are no fluid leaks.
• Check for deterioration or cracks in the hoses and fittings. If the
hoses are worn or cracked, have them replaced by your dealer.
Servicing Your Honda 161
19 TRX420TM1 FM1_31HR3650.book Page 162 Tuesday, April 3, 2018 11:37 AM
Brakes
Brake Pad Wear
Refer to Safety Precautions on page 101.
Brake pad wear will depend upon the severity of usage and riding
conditions. The pads will wear faster in wet or muddy conditions.
Inspect the pads visually during all regular service intervals to
determine the pad wear.
RIGHT FRONT (Left side similar)
(2)
(1) wear indicator
(1)
(2) edge of reference mark
Check the wear indicator (1). If the wear indicator aligns with the
edge of the reference mark (2), both pads must be replaced, see
your dealer for this replacement.
Always inspect both pads in both the right and left front brake
calipers.
162 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 163 Tuesday, April 3, 2018 11:37 AM
Brakes
Rear Brake Pedal Freeplay
RIGHT SIDE
(1)
9/16 – 13/16 in
(15 – 20 mm)
(1) rear brake pedal
Inspection
Measure the distance the rear brake pedal (1) moves before the
brake starts to take hold. Freeplay, measurement at the tip of the
end of the pedal, should be:
9/16 – 13/16 in (15 – 20 mm)
If necessary, adjust to the specified range.
Servicing Your Honda 163
19 TRX420TM1 FM1_31HR3650.book Page 164 Tuesday, April 3, 2018 11:37 AM
Brakes
Adjustment
RIGHT REAR
(3)
(2)
(2) brake pedal adjusting nut
(3) brake arm pin
1. Turn the brake pedal adjusting nut (2), located on the brake
operating rod at the rear of the frame. Make sure the cutout on
the adjusting nut is properly seated on the brake arm pin (3).
2. Adjust the freeplay of the rear brake pedal. Push the brake arm
(4), then check the clearance between the brake arm and the
brake arm pin.
(4) brake arm
164 Servicing Your Honda
(4)
19 TRX420TM1 FM1_31HR3650.book Page 165 Tuesday, April 3, 2018 11:37 AM
Brakes
Rear Brake Lever Freeplay
LEFT HANDLEBAR
(1)
9/16 – 13/16 in
(15 – 20 mm)
(1) rear brake lever/parking brake lever
Inspection
Measure the distance the rear brake lever/parking brake lever (1)
moves before the brake starts to take hold. Freeplay (measurement
at the tip of the end of the brake lever) should be:
9/16 – 13/16 in (15 – 20 mm)
If necessary, adjust to the specified range.
Servicing Your Honda 165
19 TRX420TM1 FM1_31HR3650.book Page 166 Tuesday, April 3, 2018 11:37 AM
Brakes
Adjustment
RIGHT REAR
(3)
(2)
(2) brake lever adjusting nut
(3) brake arm pin
Adjust the freeplay of the rear brake lever/parking brake lever with
the front wheels pointed straight ahead.
1. Turn the brake lever adjusting nut (2), located on the brake
operating rod at the rear of the frame. Make sure the cutout on
the adjusting nut is properly seated on the brake arm pin (3).
2. Adjust the freeplay of the rear brake lever/parking brake lever.
Push the brake arm (4) then check the clearance between the
brake arm and the brake arm pin.
(4) brake arm
166 Servicing Your Honda
(4)
19 TRX420TM1 FM1_31HR3650.book Page 167 Tuesday, April 3, 2018 11:37 AM
Brakes
Other Inspections
• Check that the brake levers, P/R lever, reverse assist lever and
brake pedal assemblies are positioned properly and the securing
bolts are tight.
• Make sure that the parking brake cable, lock lever, spring, P/R
lever, and fasteners are in good condition.
Brake Shoe Wear
Refer to Safety Precautions on page 101.
The rear brake is equipped with an external brake wear indicator
that lets you check brake wear without disassembly. Application of
the brake control causes the arrow on the brake arm to move
toward a reference mark on the brake panel.
RIGHT REAR
(2)
(3)
(1)
(1) arrow
(3) reference mark
(2) brake arm
1. Apply the brake control and check the movement of the arrow
(1) on the brake arm (2).
2. Replace the brake shoe if the arrow aligns with the reference
mark (3) on the brake panel upon full application of the brake. If
replacement is necessary, see your dealer.
Servicing Your Honda 167
19 TRX420TM1 FM1_31HR3650.book Page 168 Tuesday, April 3, 2018 11:37 AM
Brakes
Brake Light Switch Adjustment
Refer to Safety Precautions on page 101.
Rear Brake Only:
Check the operation of the rear brake light switch (1) at the right
side behind the engine from time to time. Adjustment is done by
turning the adjusting nut (2). Turn the nut in direction (A) if the
switch operates too late and in direction (B) if the switch operates
too soon.
RIGHT REAR
(A)
(1)
(1) rear brake light switch
168 Servicing Your Honda
(2)
(B)
(2) adjusting nut
19 TRX420TM1 FM1_31HR3650.book Page 169 Tuesday, April 3, 2018 11:37 AM
Brakes
Draining Water from Brakes
Refer to Safety Precautions on page 101.
RIGHT REAR
(1)
(1) rear brake drain bolt
1. Make sure the engine is OFF and the parking brake is set.
2. Remove the rear brake drain bolt (1) and sealing washer from the
bottom of the rear brake panel.
If any water drains, the brake seals must be replaced by your
dealer as soon as possible.
3. Install the rear brake drain bolt with a new sealing washer and
tighten it to the specified torque:
9 lbf·ft (12 N·m , 1.2 kgf·m)
Servicing Your Honda 169
19 TRX420TM1 FM1_31HR3650.book Page 170 Tuesday, April 3, 2018 11:37 AM
Tires
To safely operate your ATV, your tires must be the proper type and
size, in good condition with adequate tread, and correctly inflated.
WARNING
3 WARNING
Using tires that are excessively worn or
improperly inflated can cause a crash in which
you can be seriously hurt or killed.
Follow all instructions in this owner’s manual
regarding tire inflation and maintenance.
This ATV is equipped with low pressure tubeless tires. Although the
tires are designed specifically for off-road use, they are not immune
to punctures. Always select your riding area with care.
The following pages give detailed information on how and when to
check your air pressure, how to inspect your tires for wear and
damage, and our recommendations for tire repair and replacement.
170 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 171 Tuesday, April 3, 2018 11:37 AM
Tires
Air Pressure
Refer to Safety Precautions on page 101.
Properly inflated tires provide the best combination of handling,
tread life, and riding comfort. Generally, under inflated tires wear
unevenly, adversely affect handling, and are more likely to fail from
being overheated. Overinflated tires make your ATV ride harshly, are
more prone to damage from surface hazards, and wear unevenly.
Make sure the air valve caps are secure. If necessary, install new
caps.
Servicing Your Honda 171
19 TRX420TM1 FM1_31HR3650.book Page 172 Tuesday, April 3, 2018 11:37 AM
Tires
Always check air pressure when your tires are “cold.” If you check air
pressure when your tires are “warm” — even if your ATV has only
been ridden for a few miles — the readings will be higher. If you let
air out of warm tires to match the recommended cold tire pressures,
the tires will be under inflated. Be sure to check tire pressure at the
riding site, since changes in altitude can affect air pressure.
The recommended “cold” tire pressures are:
RECOMMENDED
PRESSURE
FRONT
REAR
4.4 psi (30 kPa)
4.4 psi (30 kPa)
172 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 173 Tuesday, April 3, 2018 11:37 AM
Tires
A manually operated tire pump should be used rather than the high
pressure system found in service stations. This will minimize the
possibility of tire damage from over inflation. If you use a high
pressure system at a service station, add air in small amounts and
check the pressure increase frequently to prevent possible tire
damage from over inflation
WARNING
3 WARNING
Operating this ATV with improper tires, or
with uneven tire pressure may cause loss of
control, and you could be seriously injured or
killed.
• Always use the size and type tires specified
in this owner’s manual for this vehicle.
• Always maintain proper tire pressure as
described in this owner’s manual.
Inspection
Refer to Safety Precautions on page 101.
Whenever you check the tire pressures, you should also look for:
• Bumps or bulges in the side of the tire or the tread. Replace any
tire that has a bump or bulge.
• Cuts, slits, or cracks in the tires. Replace the tire if you can see
fabric or cord.
• Nails or other foreign objects embedded in the side of the tire or
tread.
• Excessive tread wear.
Servicing Your Honda 173
19 TRX420TM1 FM1_31HR3650.book Page 174 Tuesday, April 3, 2018 11:37 AM
Tires
Also, if you hit a pothole or other hard object while riding, stop as
soon as you safely can and carefully inspect the tires for damage.
Tread Wear
FRONT
NEW
Replace
3/16 in
(4 mm)
(2)
(1)
REAR
(3)
3/16 in
(4 mm)
Replace
NEW
(1) groove depth
(2) wear indicator
(3) wear indicator
location mark
To check the condition of a tire tread, measure the groove depth (1)
in the center of the tire, or check the wear indicator (2).
For best performance, you should replace a tire before the tread
depth at the center reaches the following limits:
front
rear
174 Servicing Your Honda
3/16 in (4 mm)
3/16 in (4 mm)
19 TRX420TM1 FM1_31HR3650.book Page 175 Tuesday, April 3, 2018 11:37 AM
Tires
Tire Repair
Refer to Safety Precautions on page 101.
A tire that is repaired, either temporarily or permanently, will have
lower speed and performance limits than a new or undamaged tire.
A temporary repair can sometimes be made in an emergency
situation. However, since a temporary repair may not hold, you must
ride very slowly, preferably without any cargo, and have the tire
replaced or permanently repaired as soon as possible. (For more
information on temporary repairs, see If You Have a Flat Tire,
page 207.)
A permanent repair, such as an internal plug patch, can be made if
a tire has only a small puncture in the tread area. However you may
not be able to safely carry as much weight. If you choose to have a
tire repaired, be sure the repair work is performed by a professional.
If you have a tire professionally repaired at a non-Honda facility, we
recommend that you have the work checked by your dealer.
Servicing Your Honda 175
19 TRX420TM1 FM1_31HR3650.book Page 176 Tuesday, April 3, 2018 11:37 AM
Tires
Tire Replacement
Refer to Safety Precautions on page 101.
The tires that came on your ATV were designed to match the
performance capabilities of your ATV and provide the best
combination of handling, braking, and comfort.
It is best to replace all four tires, however if that is not possible, you
must replace the tires in pairs (front or rear) with tires of the same
size and type as the originals. Never replace just one tire.
WARNING
3 WARNING
Installing improper tires on your ATV can
affect handling and stability. This can cause a
crash in which you can be seriously hurt or
killed.
Always use the size and type of tires
recommended in this owner’s manual.
The recommended tires for your ATV are:
front
rear
AT24 × 8-1211
AT24 × 10-1111
MAXXIS M977
MAXXIS M978
When you replace a tire, remember:
Have the tire replaced by your dealer if possible.
If you have a tire professionally replaced at a non-Honda facility, we
recommended that you have the work checked by your dealer.
176 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 177 Tuesday, April 3, 2018 11:37 AM
Guards
Skid Plate & Engine Guard
Refer to Safety Precautions on page 101.
(1)
(1) engine guard
(2)
(2) skid plate
The engine guard (1) protects the frame and engine crankcase.
The skid plate (2) protects the rear final gear case. Check the guard
and plate for cracks, damage or looseness at intervals shown in the
Maintenance Schedule.
Have the engine guard and skid plate replaced if they are cracked or
damaged. If the guard and plate bolts are loose, tighten them
securely.
Servicing Your Honda 177
19 TRX420TM1 FM1_31HR3650.book Page 178 Tuesday, April 3, 2018 11:37 AM
Guards
Front Boot Guards & Front Driveshaft Guards
(Except TRX420TM1)
Refer to Safety Precautions on page 101.
FRONT
(1)
(2)
(1) front boot guards
(2) front driveshaft guards
Check the front boot guards (1) and front driveshaft guards (2) for
cracks, damage or looseness.
Tighten any loose fasteners. Replace the front boot guards and front
driveshaft guards as required.
178 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 179 Tuesday, April 3, 2018 11:37 AM
Drivetrain Boots
Propeller Shaft Boots & Yoke Joint Boot
Refer to Safety Precautions on page 101.
(1)
(2)
(1) propeller shaft boots (Except TRX420TM1)
(2) yoke joint boot
Check the propeller shaft boots (1) and yoke joint boot (2) for
damage or leaking grease. If necessary, have your dealer replace
them.
Servicing Your Honda 179
19 TRX420TM1 FM1_31HR3650.book Page 180 Tuesday, April 3, 2018 11:37 AM
Drivetrain Boots
Front Driveshaft Boots (Except TRX420TM1)
Refer to Safety Precautions on page 101.
FRONT
(1)
(1) driveshaft boots
Check the driveshaft boots (1) for cuts, damage or leaking grease. If
necessary, have your dealer replace them.
180 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 181 Tuesday, April 3, 2018 11:37 AM
Electrical
Battery
Your ATV has a maintenance-free type battery. You do not have to
check the battery electrolyte level or add distilled water as you would
with a conventional-type battery.
NOTICE
Your battery is a maintenance-free type and can be permanently
damaged if the cap strip is removed.
Electrical accessories use current from the battery, even when the
ignition is OFF. Limited operation also allows the battery to
discharge.
If you have electrical accessories on your ATV or do not ride
frequently, we recommend that you charge the battery frequently
(see Battery Charging, page 185).
If you do not expect to ride your ATV for at least two weeks, we
recommend you remove the battery, or at least disconnect the
battery cables (negative cable first).
If you plan to store your ATV, see Battery Storage, page 182.
If your battery seems weak and/or is leaking electrolyte (causing slow
starting or other electrical problems), see your dealer.
WARNING: Battery posts, terminals and related accessories contain
lead and lead compounds. Wash your hands after handling.
Servicing Your Honda 181
19 TRX420TM1 FM1_31HR3650.book Page 182 Tuesday, April 3, 2018 11:37 AM
Battery
Battery Storage
Refer to Safety Precautions on page 101.
If you plan to store your ATV, we recommend you remove the
battery and store it where it can be charged at least every 30 days to
maintain its service life.
If you do not remove the battery, we recommend disconnecting the
battery cables (negative cable first).
You will get the best storage results from removing the battery and
slow charging it every 30 days (see Battery Charging, page 185).
Before you remove the battery, be sure to read all the information
that follows, as well as the information on the battery label.
WARNING
3 WARNING
The battery gives off explosive hydrogen gas
during normal operation.
A spark or flame can cause the battery to
explode with enough force to kill or seriously
hurt you.
Wear protective clothing and a face shield, or
have a skilled mechanic do the battery
maintenance.
182 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 183 Tuesday, April 3, 2018 11:37 AM
Battery
The battery is located in a compartment under the rear fender cover.
UNDER REAR FENDER COVER
(1)
(2)
(4)
(3)
(3) battery
(1) rubber band
(2) negative (–) terminal lead (4) positive (+) terminal lead
Removal
1. Make sure the ignition switch is OFF (w).
2. Remove the seat (page 112).
3. Remove the rear fender cover (page 115).
4. Release the rings and remove the rubber band (1).
5. Disconnect the negative (–) terminal lead (2) from the battery (3)
first, then disconnect the positive (+) terminal lead (4).
(cont’d)
Servicing Your Honda 183
19 TRX420TM1 FM1_31HR3650.book Page 184 Tuesday, April 3, 2018 11:37 AM
Battery
6. Remove the battery and take care not to drop the terminal nuts.
7. Charge the battery (see following section).
8. Store your battery in an easy-to-reach location off the floor, in an
area protected from freezing temperature and direct sunlight.
9. Clean the compartment after removing the battery for storage.
Dry the compartment.
10. Slow charge the battery (see following section) once every 30
days.
Installation
1. Check that the battery rubber (5) for damage. If necessary,
replace the battery rubber.
2. Make sure the battery rubber is properly installed.
3. Reinstall in the reverse order of removal.
Be sure to connect the positive (+) terminal first, then the
negative (–) terminal.
4. Make sure all bolts and other fasteners are secure.
5. Install the removed parts in reverse order of removal.
(5)
(5) battery rubber
184 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 185 Tuesday, April 3, 2018 11:37 AM
Battery
Battery Charging
Refer to Safety Precautions on page 101.
(1)
(1) charger
Be sure to read the information that came with your battery charger
and follow the instructions on the battery. Improper charging may
damage the battery.
We recommend using a charger (1) designed specifically for your
Honda, which can be purchased from your dealer. These units can
be left connected for long periods without risking damage to the
battery. However, do not intentionally leave the charger connected
longer than the time period recommended in the charger’s
instructions. Avoid using an automotive-type battery charger. An
automotive charger can overheat an ATV battery and cause
premature damage.
Servicing Your Honda 185
19 TRX420TM1 FM1_31HR3650.book Page 186 Tuesday, April 3, 2018 11:37 AM
Appearance Care
Frequent cleaning and polishing will keep your Honda looking newer
longer.
Frequent cleaning also identifies you as an owner who values his
ATV.
A clean ATV is also easier to inspect and service.
General Recommendations
Refer to Safety Precautions on page 101.
• To clean your ATV, you may use:
– water
– Hondabrite
– a mild, neutral detergent and water
– a mild spray and wipe cleaner/polisher
– a mild spray and rinse cleaner/degreaser and water
• Avoid products that contain harsh detergents or chemical
solvents that could damage the metal, paint, plastic, and
camouflage coating on your ATV (Honda MUV).
• If your ATV is still warm from recent operation, give the engine
and exhaust system time to cool off.
• Park in a shady area. Washing your ATV in bright sunlight may
cause the finish to fade because water droplets intensify the sun’s
brightness.
• Spotting is also more likely because surface water can dry before
you have time to wipe it off.
• Clean your ATV regularly to protect surface finishes.
• We recommend the use of a low pressure garden hose to wash
your ATV. High pressure washers (like those at coin-operated car
washers) can damage certain parts of your ATV.
186 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 187 Tuesday, April 3, 2018 11:37 AM
Appearance Care
NOTICE
High pressure water (or air) can damage certain parts of your ATV.
Water entering the muffler may damage the oxygen sensor.
• After cleaning, inspect for damage, wear, and leaks (fuel, oil,
coolant and brake fluid).
Washing Your ATV with a Mild Detergent
Refer to Safety Precautions on page 101.
1. Cover or plug the exhaust outlet prior to washing your ATV.
2. Rinse your ATV thoroughly with cool water to remove loose dirt.
3. Fill a bucket with cool water. Mix in a mild, neutral detergent,
such as dish washing liquid or a product made especially for
washing motorcycles or automobiles.
4. Wash your ATV with a sponge or soft towel. As you wash, check
for heavy grime. If necessary, use a mild cleaner/degreaser to
remove the grime.
5. After washing, rinse your ATV thoroughly with plenty of clean
water to remove any residue. Detergent residue can corrode alloy
parts.
6. Dry your ATV with a chamois or a soft towel. Leaving water on
the surface to air dry can cause dulling and water spots. As you
dry, inspect for chips and scratches.
7. Remove the cover or the plug from exhaust outlet. Then, start the
engine and let it idle for several minutes. The engine heat will
help dry moist areas.
8. As a precaution, ride your ATV at a slow speed and apply the
brakes several times. This will help dry the brakes and restore
normal braking performance.
Servicing Your Honda 187
19 TRX420TM1 FM1_31HR3650.book Page 188 Tuesday, April 3, 2018 11:37 AM
Appearance Care
Spray Cleaning Your ATV
Refer to Safety Precautions on page 101.
Avoid using spray cleaner products on the tires or suspension
components.
Suggestions for using spray cleaner(s) follow:
ATV condition
Dust and fingerprint
smudges.
Light road grimes.
Heavy grime. Oil leaks.
Brake dust.
Dull, corroded chrome
or aluminum.
188 Servicing Your Honda
Recommended Cleaning
Apply a spray cleaner/polish
and wipe paint, chrome, glass,
and clear plastic.
Spray any difficult-to-reach or
very dirty areas with a spray
cleaner/degreaser.
Rinse and dry.
Apply a spray cleaner/polish
and wipe with a non-abrasive
cloth.
Use a spray cleaner/degreaser.
If necessary, rub with a
sponge.
Rinse and dry.
Apply a spray cleaner/polish
and wipe with a non-abrasive
cloth.
Apply a high quality chrome/
aluminum polish and wipe
with a non-abrasive cloth.
19 TRX420TM1 FM1_31HR3650.book Page 189 Tuesday, April 3, 2018 11:37 AM
Appearance Care
Finishing Touches
Refer to Safety Precautions on page 101.
After washing your ATV, consider using a commercially available
spray cleaner/polish or quality liquid or paste wax to finish the job.
Use only a non-abrasive polish or wax made specifically for
motorcycles or automobiles. Apply the polish or wax according to
the instructions on the container.
If a surface on your ATV is chipped or scratched, your dealer has
touch-up paint to match your ATV’s color. Be sure to use your ATV’s
color code (page 223) when you buy touch-up paint.
If the frame has a chip that exposes the metal, first apply primer (to
prevent corrosion) and then apply the touch-up paint. Several thin
layers of touch-up paint are better than one thick coat.
Exhaust Pipe and Muffler Maintenance
The exhaust pipe and muffler are stainless steel but may become
stained by mud or dust.
To remove mud or dust, use a wet sponge and a liquid kitchen
abrasive, then rinse well with clean water. Dry with chamois or a soft
towel.
If necessary, remove heat stains by using a commercially available
fine texture compound. Then rinse by the same manner as removing
mud or dust.
Servicing Your Honda 189
19 TRX420TM1 FM1_31HR3650.book Page 190 Tuesday, April 3, 2018 11:37 AM
190 Servicing Your Honda
19 TRX420TM1 FM1_31HR3650.book Page 191 Tuesday, April 3, 2018 11:37 AM
Tips
Here’s helpful advice on how to prepare for an off-road adventure,
how to transport and store your Honda, and how to be an
environmentally responsible ATV owner.
Tips
Preparing for a Ride .................................................................. 192
What to Take to the Riding Area............................................ 192
What to Take on the Trail ...................................................... 193
Transporting Your Honda ......................................................... 194
Storing Your Honda.................................................................. 196
Preparation for Storage.......................................................... 197
Removal from Storage ........................................................... 199
You & the Environment ............................................................ 200
Tips 191
19 TRX420TM1 FM1_31HR3650.book Page 192 Tuesday, April 3, 2018 11:37 AM
Preparing for a Ride
A safe and enjoyable ride begins with good planning and
preparation. Always ride with at least one other person in case you
have trouble, and let someone know where you’re going and when
you expect to return.
Before riding in an unfamiliar area, find out in advance if you need
special permits, get maps so you can study the terrain, and talk to
other riders who know the area. The Forest Service and the Bureau
of Land Management (USA only), the Ministry of Natural Resources
(Canada only), riding clubs, and off-road magazines are good
sources of information.
What to Take to the Riding Area
Along with your ATV and riding gear, you should take along some
tools and supplies in case you have a problem. For some of the
difficulties you might encounter, see Taking Care of the Unexpected,
which begins on page 202.
We recommend that you always take water, food, a first aid kit, and
your owner’s manual. Other items you should consider loading on
your truck or trailer include:
• a tool kit
• tire repair supplies and tools, and tires
• extra parts, control levers, cables, and spark plugs
• wire, duct tape, and rope
• extra gasoline
For safety, all refueling should be done at a gas station on the way
to the riding area or at your base camp.
192 Tips
19 TRX420TM1 FM1_31HR3650.book Page 193 Tuesday, April 3, 2018 11:37 AM
Preparing for a Ride
What to Take on the Trail
What you take with you during a ride depends on the kind of terrain,
how long you expect to ride, how far you might go from your base
camp or help, and how experienced you or your companions are in
making repairs.
If you decide to take some tools, spare parts, or other supplies on the
trail, be sure you can carry them safely and know how to use them.
Also, be sure to follow the loading guidelines and weight limits
(page 58).
Tips 193
19 TRX420TM1 FM1_31HR3650.book Page 194 Tuesday, April 3, 2018 11:37 AM
Transporting Your Honda
Do not tow your ATV behind a car or other vehicle.
When you transport your ATV, we recommend that you carry the
vehicle in its normal operating position (on all four wheels). Do not
incline the vehicle upright on its rear end. This can damage the
vehicle, and leaking gasoline could be a hazard.
Follow these procedures:
1. Set the parking brake and place the transmission in gear.
194 Tips
19 TRX420TM1 FM1_31HR3650.book Page 195 Tuesday, April 3, 2018 11:37 AM
Transporting Your Honda
2. Secure the vehicle with tie-down straps in the areas shown.
• Suitable tie-down straps are available from your dealer.
• Ordinary rope is not recommended because it can stretch
under load.
• Using tie-down straps in any other areas can damage your ATV.
3. Rock the vehicle back and forth to make sure the tie-down straps
are tight and the vehicle is secure.
(1)
(2)
(3)
(1) front cargo rack
(2) rear cargo rack
(3) trailer hitch
Tips 195
19 TRX420TM1 FM1_31HR3650.book Page 196 Tuesday, April 3, 2018 11:37 AM
Storing Your Honda
If you won’t be riding for an extended period, such as during the
winter, thoroughly inspect your ATV and correct any problem before
storing it. That way, needed repairs won’t be forgotten and it will be
easier to get your ATV running again.
For more information about storage, refer to the Honda Winter
Storage Guide, available from your dealer (USA only).
We suggest you perform the following procedures to keep your ATV
in top condition. These storage procedures will reduce the
deterioration that can occur during storage.
196 Tips
19 TRX420TM1 FM1_31HR3650.book Page 197 Tuesday, April 3, 2018 11:37 AM
Storing Your Honda
Preparation for Storage
Refer to Safety Precautions on page 101.
1. Change the engine oil and filter (page 125).
2. Make sure the cooling system is filled with a 50/50% antifreeze
solution (page 134).
3. Fill the fuel tank. Make sure the fuel fill cap is properly installed.
4. To prevent rusting in the cylinder, perform the following:
• Remove the spark plug cap from the spark plug (page 151).
• Remove the spark plug.
Do not connect the spark plug to the spark plug cap.
• Pour a tablespoon (15 – 20 cc) of clean engine oil into the
cylinder and cover the spark plug hole with a piece of cloth.
• With the engine stop switch in the RUN (e) position, press the
start button several times to crank the engine and distribute
the oil.
• Reinstall the spark plug and spark plug cap.
(cont’d)
Tips 197
19 TRX420TM1 FM1_31HR3650.book Page 198 Tuesday, April 3, 2018 11:37 AM
Storing Your Honda
5. Remove the battery and charge it fully. Store it in an area
protected from freezing temperatures and direct sunlight. Slow
charge the battery (page 185) once a month.
WARNING
3 WARNING
The battery gives off explosive hydrogen gas
during normal operation.
A spark or flame can cause the battery to
explode with enough force to kill or seriously
hurt you.
Wear protective clothing and a face shield, or
have a skilled mechanic do the battery
maintenance.
6. Wash and dry your ATV. Wax all painted surfaces.
7. Inflate the tires to their recommended pressures (page 172).
8. Store your ATV in an unheated area, free of dampness, away
from sunlight, with a minimum of daily temperature variation.
9. Place your ATV on blocks to lift all tires off the floor.
10. Cover your ATV with a porous material. Avoid using plastic or
similar non-breathing, coated materials that restrict air flow and
allow heat and moisture to accumulate.
NOTICE
Do not store your ATV in an upright position for extended periods of
time. The ATV should be stored with all four tires on the ground. This
can damage the vehicle, and leaking gasoline could be a hazard.
198 Tips
19 TRX420TM1 FM1_31HR3650.book Page 199 Tuesday, April 3, 2018 11:37 AM
Storing Your Honda
Removal from Storage
Refer to Safety Precautions on page 101.
1. Uncover and clean your ATV.
2. If your ATV has been stored for more than four months —
change the engine oil (page 125).
3. If your ATV has been stored for more than two months — ask
your dealer to drain and replace the fuel.
4. Charge the battery (page 185) as required. Install the battery.
5. Perform a pre-ride inspection (page 53), then test-ride your ATV
at low speeds.
Tips 199
19 TRX420TM1 FM1_31HR3650.book Page 200 Tuesday, April 3, 2018 11:37 AM
You & the Environment
Owning and riding an ATV can be enjoyable, but you must do your
part to protect nature. When you show respect for the land, wildlife,
and other people, you also help preserve the sport of off-road riding.
Following are tips on how you can be an environmentally responsible
ATV owner.
• Tread Lightly. Stay on existing roads and trails, avoid surfaces
that are easily damaged, and ride only in areas approved for offroad vehicles.
• Keep the Noise Down. Loud vehicles can be offensive. Ride as
quietly as possible, don’t remove your spark arrester, and don’t
modify the muffler or any other part of your air intake and
exhaust systems. Such modifications not only increase noise, they
also reduce engine performance and may be illegal.
• Choose Sensible Cleaners. Use a biodegradable detergent
when you wash your ATV. Avoid aerosol spray cleaners that
contain chlorofluorocarbons (CFCs) which damage the
atmosphere’s protective ozone layer. Don’t throw cleaning
solvents away; see the following guidelines for proper disposal.
• Recycle Wastes. It’s illegal and thoughtless to put used engine
oil in the trash, down a drain, or on the ground. Used oil,
gasoline, and cleaning solvents contain poisons that can hurt
refuse workers and contaminate our drinking water, lakes, rivers,
and oceans. Before changing your oil, make sure you have the
proper containers. Put oil and other toxic wastes in separate
sealed containers and take them to a recycling center. Call your
local or state office of public works or environmental services to
find a recycling center in your area, and to get instructions on
how to dispose of non-recyclable wastes.
200 Tips
19 TRX420TM1 FM1_31HR3650.book Page 201 Tuesday, April 3, 2018 11:37 AM
Taking Care of the Unexpected
With all the challenges you can encounter off-road, there’s a chance
that sometime something may go wrong. This section gives practical
advice to help you deal with a wide range of problems. Take time to
read this section before you ride. Also review the tips in Preparing for
a Ride (page 192).
Taking Care of the Unexpected
General Guidelines ................................................................... 202
If Your Engine Quits or Won’t Start .......................................... 204
If You Have a Flat Tire............................................................... 207
If the High Coolant Temperature Indicator Lights ...................... 211
If a Fuse Blows.......................................................................... 213
If You Crash ............................................................................. 217
If You Lose Your Key ................................................................ 218
If the Battery Is Low (or Dead)................................................... 219
If a Component Fails................................................................. 220
Taking Care of the Unexpected 201
19 TRX420TM1 FM1_31HR3650.book Page 202 Tuesday, April 3, 2018 11:37 AM
Taking Care of the Unexpected
General Guidelines
Keeping your ATV well-maintained is the best way to reduce the
possibility of having a problem while riding. However, problems can
arise even with well-maintained machines.
Remember to take along your owner’s manual, the tool kit that
came with your ATV, and any other items (such as tire repair supplies
and additional tools) that might help you solve a problem on your
own.
If something goes wrong during a ride, the first thing to do is stop as
soon as you safely can. Do not continue riding if you have a flat tire,
or you hear an unusual noise, or your ATV just doesn’t feel right. If
you continue riding, you could cause more damage and endanger
your own safety.
After stopping, take time to assess the situation. Carefully inspect
your ATV to identify the problem, then consider your options before
you decide what to do.
If a problem is relatively minor and you have the tools, supplies, and
skills to make a permanent repair, you may be able to fix it on the
trail and continue riding. Or, you may be able to make a temporary
repair that allows you to slowly ride back to your base where you can
make a permanent repair or get help.
When a problem is more serious — or you don’t have the tools,
supplies, experience, or time to deal with it — you need to choose
the safest way to get yourself and your ATV back to base. For
example, if you are close enough, you (or you and another person)
might be able to push it back.
202 Taking Care of the Unexpected
19 TRX420TM1 FM1_31HR3650.book Page 203 Tuesday, April 3, 2018 11:37 AM
Taking Care of the Unexpected
Should you ever have a problem while riding, please follow these
guidelines:
• Always put personal safety first.
• Take time to assess the situation and your options before
deciding what to do.
• If the problem is relatively minor and you have the tools, supplies,
and skills to make a temporary repair, be sure to have permanent
repairs made as soon as possible.
• Do not continue riding if you are hurt or your ATV is not in safe
riding condition.
Additional recommendations for specific problems follow.
Taking Care of the Unexpected 203
19 TRX420TM1 FM1_31HR3650.book Page 204 Tuesday, April 3, 2018 11:37 AM
If Your Engine Quits or Won’t
Start
Proper operation and maintenance can prevent starting and engine
performance problems. In many cases, the cause of the problem may
be a simple operational oversight.
If you have a problem starting the engine — or experience poor
engine performance — the following information may help you. If
you can’t correct the problem, see your dealer.
If your ATV won’t start, listen as you press the start button. If you
don’t hear the starter motor turning, refer to the Starter motor
doesn’t operate symptom. If you can hear the starter motor working
normally, refer to the Starter motor works, but the engine won’t
start symptom.
204 Taking Care of the Unexpected
19 TRX420TM1 FM1_31HR3650.book Page 205 Tuesday, April 3, 2018 11:37 AM
If Your Engine Quits or Won’t
Start
SYMPTOM: Starter motor doesn’t operate.
POSSIBLE CAUSE
WHAT TO DO
ignition switch OFF
Turn the ignition switch ON.
engine stop switch OFF
Slide the engine stop switch to
RUN.
transmission not in
Shift into neutral.
neutral
blown fuse
Replace with a new fuse of the
same rating (page 213).
battery lead loose
Tighten the battery lead.
low (or dead) battery
Charge the battery (page 185).
If charging doesn’t help, see
your dealer.
faulty starter motor
If all possible causes are
negative, the starter motor
may be faulty. See your dealer.
SYMPTOM: Starter motor works, but the engine won’t
start.
POSSIBLE CAUSE
WHAT TO DO
out of fuel
Fill the fuel tank.
flooded engine
See Flooded Engine (page 73).
loose or unconnected
Install the spark plug cap
spark plug cap
securely. If the engine still
won’t start, see your dealer.
loose battery cables
Tighten the battery terminal
bolts.
weak battery
Charge the battery (page 185).
If charging doesn’t help, see
your dealer.
Taking Care of the Unexpected 205
19 TRX420TM1 FM1_31HR3650.book Page 206 Tuesday, April 3, 2018 11:37 AM
If Your Engine Quits or Won’t
Start
SYMPTOM: Engine starts, but runs poorly.
POSSIBLE CAUSE
WHAT TO DO
high coolant
Check the coolant
temperature
temperature gauge (Except
TRX420TM1) and high coolant
temperature indicator. Refer
to If the High Coolant
Temperature Indicator Lights,
page 211.
runs erratically, misfires
See your dealer.
blubbers (rich fuel
See your dealer.
mixture)
sooty exhaust (rich fuel
See your dealer.
mixture)
detonates or pings
If applicable, switch to the
under load
recommended octane gasoline
(page 117) or change your
brand of gasoline. If the
problem persists, see your
dealer.
afterfires (backfires)
See your dealer.
See your dealer.
pre-ignition (runs on
after ignition switched
OFF)
SYMPTOM: Engine starts, but runs poorly or dies when
hot.
POSSIBLE CAUSE
WHAT TO DO
poor or inadequate
See your dealer.
fuel flow due to
(ensure clean fuel supply)
clogged fuel filter
206 Taking Care of the Unexpected
19 TRX420TM1 FM1_31HR3650.book Page 207 Tuesday, April 3, 2018 11:37 AM
If You Have a Flat Tire
How you handle a flat tire on the trail depends on how serious the
tire damage is, and what tools and supplies you have with you.
If you have a slow leak or a minor puncture, use the plug method to
make a temporary repair. (The plug method is applied from the
outside of the tire and is the same as that for conventional tubeless
tires.)
A plug-type repair kit, available at most auto parts stores or service
stations, provides a plug, an installation tool, tire cement, and an
instruction sheet. Follow the instructions provided with the repair kit
to make a temporary repair.
As soon as possible, have the tire permanently repaired by your
dealer. Any tire that cannot be repaired should be replaced.
Whenever the ATV is to be operated far from service facilities or
available transportation, we recommend that you carry a tire pump
and a repair kit with the vehicle.
If the leak is more serious, or a temporary repair doesn’t hold, the
tire must be replaced. The tire will also need to be replaced if it is
damaged (page 176). Replacing a tire involves removing and reinstalling the wheel (page 209).
If you are unable to repair a flat tire on the trail, you will need to send
for help. We strongly recommend that you do not try to ride with a
flat tire. The ATV will be hard to handle, and if the tire comes off the
rim, it may lock up the wheel and cause you to crash.
Taking Care of the Unexpected 207
19 TRX420TM1 FM1_31HR3650.book Page 208 Tuesday, April 3, 2018 11:37 AM
If You Have a Flat Tire
WARNING
3 WARNING
Riding your ATV with a temporary tire repair
can be risky.
If the temporary repair fails, you can crash
and be seriously injured or killed. If you must
ride with a temporary tire repair, ride slowly
and carefully until the tire is permanently
repaired or replaced.
208 Taking Care of the Unexpected
19 TRX420TM1 FM1_31HR3650.book Page 209 Tuesday, April 3, 2018 11:37 AM
If You Have a Flat Tire
Emergency Wheel Removal/Installation
Refer to Safety Precautions on page 101.
(1)
(2)
(1)
(1) wheel nuts
(2) wheel rim
Removal
1. Park your ATV on a firm, level surface.
2. Loosen — but do not remove — the wheel nuts (1).
3. Raise the front (or rear) wheels off the ground and place a
support block under the vehicle.
4. Remove the wheel nuts.
5. Remove the wheel.
• Avoid getting grease, oil, or dirt on the front brake disc or pad
surfaces when removing and installing each wheel. Any
contamination can cause poor brake performance or rapid pad
wear after reassembly.
Taking Care of the Unexpected 209
19 TRX420TM1 FM1_31HR3650.book Page 210 Tuesday, April 3, 2018 11:37 AM
If You Have a Flat Tire
Installation
1. Position the wheel.
2. Position the wheel nuts so that the tapered sides face the wheel
rim (2).
3. Hand-tighten the wheel nuts on the wheel, then lower the ATV
to the ground before tightening the nuts in a crisscross (rather
than circular) pattern to the specified torque:
47 lbf·ft (64 N·m , 6.5 kgf·m)
If a torque wrench was not used for installation, see your dealer as
soon as possible to verify proper assembly. Improper assembly may
lead to loss of braking capability.
210 Taking Care of the Unexpected
19 TRX420TM1 FM1_31HR3650.book Page 211 Tuesday, April 3, 2018 11:37 AM
If the High Coolant Temperature
Indicator Lights
Normally, the high coolant temperature indicator will only light
momentarily when you turn the ignition to ON (q).
High coolant temperature may be caused by restriction of air flow to
the radiator (such as mud caked on the radiator), extended idling, an
oil leak, a coolant leak, a low oil level, a low coolant level, or
extended operation under adverse conditions.
If the all segment of the coolant temperature gauge (Except
TRX420TM1) and high coolant temperature indicator are on while
you’re riding, don’t ignore it. Pull safely to a stop. Stop the engine as
soon as it’s safe to do so, and let it cool.
NOTICE
Continuing to ride with high coolant temperature or an overheated
engine can cause serious engine damage.
• A steaming engine indicates a coolant leak. Shut the engine off
and wait until the steaming stops. Look for a leak, but don’t
touch the engine or radiator system. Let everything cool off first.
• Check for any restriction of air flow to the radiator.
• If there’s no obvious problem, leave the engine on so the fan and
coolant circulating system can continue working. Monitor the
coolant temperature gauge (Except TRX420TM1) and high
coolant temperature indicator. The indicator may turn off after a
brief stop with no load on the engine.
• Check the radiator fan.
If the fan is not working, turn the engine off. Open the fuse box
(page 214) and check the radiator fan fuse. If the fuse is blown,
replace it with the proper (same rating) spare fuse. Start the
engine. If the all segment of the coolant temperature gauge
(Except TRX420TM1) and high coolant temperature indicator
stays on, turn the engine off.
If the radiator fan is working, visually check the coolant level in
the reserve tank, located under the left front fender. It isn’t
necessary to touch the radiator system.
Taking Care of the Unexpected 211
19 TRX420TM1 FM1_31HR3650.book Page 212 Tuesday, April 3, 2018 11:37 AM
If the High Coolant Temperature
Indicator Lights
• If the reserve tank is low or empty, don’t ride without adding
coolant (page 135). After adding coolant, turn the engine on and
check the coolant temperature gauge (Except TRX420TM1) and
high coolant temperature indicator.
If the indicator doesn’t turn off, do not ride. The engine needs
repair.
Transport your ATV to your dealer (page 194).
If the temperature drops to normal, check the coolant level. If it
has gone down, add more coolant.
• Check for an oil leak.
• Check the oil level. If necessary, add the recommended oil
(page 123) to the upper level mark. If you must leave your ATV to
get oil, secure it as much as possible.
• Start the engine, and check that the coolant temperature gauge
(Except TRX420TM1) and high coolant temperature indicator
goes off.
If you are able to resume riding, continue to monitor the coolant
temperature gauge (Except TRX420TM1) and high coolant
temperature indicator frequently.
If there is an oil leak — do not ride the ATV until the leak is repaired
by your dealer (page 194).
If there’s a mild coolant leak, you can ride for awhile, carefully
watching the coolant temperature gauge (Except TRX420TM1) and
high coolant temperature indicator. Be prepared to stop and add
more coolant or water. If the leak is bad, transport your ATV to your
dealer (page 194).
212 Taking Care of the Unexpected
19 TRX420TM1 FM1_31HR3650.book Page 213 Tuesday, April 3, 2018 11:37 AM
If a Fuse Blows
All of the electrical circuits on your ATV have fuses to protect them
from damage caused by excess current flow (short circuit or
overload).
If something electrical on your ATV stops working, the first thing you
should check for is a blown fuse (1).
Check all the fuses before looking elsewhere for another possible
cause of the problem. Replace any blown fuses and check
component operation.
(1)
(1) blown fuse
The main fuse and the circuit fuses are located under the rear fender
cover.
Recommended Fuses
main fuse 1
main fuse 2
other fuses
30 A
10 A
20 A × 3, 10 A
Taking Care of the Unexpected 213
19 TRX420TM1 FM1_31HR3650.book Page 214 Tuesday, April 3, 2018 11:37 AM
If a Fuse Blows
Main Fuses Access
1. To prevent an accidental short circuit, turn the ignition switch to
OFF (w) before checking or replacing the fuses.
2. Remove the seat (page 112).
3. Remove the rear fender cover (page 115).
4. To access the main fuse (2) (3), remove the fuse box cover (4).
UNDER REAR FENDER COVER
(4)
(5)
(2)
(3)
(2) main fuse 1
(3) main fuse 2
(4) fuse box cover
(5) spare fuses
5. Pull the main fuse out.
If it is blown, install the spare fuses (5).
214 Taking Care of the Unexpected
19 TRX420TM1 FM1_31HR3650.book Page 215 Tuesday, April 3, 2018 11:37 AM
If a Fuse Blows
Circuit Fuses Access
(7)
(6)
(6) circuit fuses
(7) spare fuses
6. To check or replace a circuit fuse (6), pull the old fuse out of its
retaining clips.
If the fuse is blown, replace it with a spare fuse (7) of the same
rating.
If you do not have a replacement fuse with the proper rating for the
circuit, install one with a lower rating.
NOTICE
Replacing a fuse with one that has a higher rating greatly increases
the chance of damage to the electrical system.
7. Install the fuse box cover.
8. Install the rear fender cover.
9. Install the seat.
10.
Taking Care of the Unexpected 215
19 TRX420TM1 FM1_31HR3650.book Page 216 Tuesday, April 3, 2018 11:37 AM
If a Fuse Blows
If you do not have a spare fuse and you cannot ride the ATV without
fixing the problem, take a fuse of the same rating or a lower rating
from one of the other circuits that you can do without temporarily.
If you replace a blown fuse with a spare fuse that has a lower rating,
replace the fuse with the correct rating as soon as you can. Also
remember to replace any spare fuses that were installed.
If the replacement fuse of the same rating burns out in a short time,
there is probably a serious electrical problem on your ATV. Leave the
blown fuse in that circuit and have your ATV checked by your dealer.
216 Taking Care of the Unexpected
19 TRX420TM1 FM1_31HR3650.book Page 217 Tuesday, April 3, 2018 11:37 AM
If You Crash
Personal safety is your first priority after a crash. If you or anyone else
has been injured, take time to assess the severity of the injuries and
whether it is safe to continue riding. If you cannot ride safely, send
someone for help. Do not ride if you will risk further injury.
If you decide you are capable of riding safely, carefully inspect your
ATV for damage and determine if it is safe to ride. Check the
tightness of critical nuts and bolts securing such parts as the
handlebar, control levers, brakes, and wheels.
If there is minor damage, or you are unsure about possible damage
but decide to try riding the ATV back to your base, ride slowly and
cautiously.
Sometimes, crash damage is hidden or not immediately apparent.
When you get home, thoroughly check your ATV and correct any
problems you find. Also, be sure to have your dealer check the frame
and suspension after any serious crash.
Taking Care of the Unexpected 217
19 TRX420TM1 FM1_31HR3650.book Page 218 Tuesday, April 3, 2018 11:37 AM
If You Lose Your Key
Be sure to record your key number (1). Store the spare key and
recorded key number in a safe location. You’ll need this number to
have a duplicate key made.
If you lose your key and aren’t carrying a duplicate, either get your
spare or have one made. If you don’t know your key number, call the
dealer where you purchased your Honda ATV. They may have it
listed in their records. If they don’t, transport your ATV to them or
the nearest dealer. The dealer will probably have to remove the
ignition switch assembly to find the key number so they can make a
key for you.
(1)
(1) key number
218 Taking Care of the Unexpected
19 TRX420TM1 FM1_31HR3650.book Page 219 Tuesday, April 3, 2018 11:37 AM
If the Battery Is Low (or Dead)
Jump starting is not recommended, especially if you use an
automobile battery. The greater amperage of an automobile battery
when the car engine is running can damage your ATV’s electrical
system.
Bump starting is also not recommended.
If you can’t charge the battery or it appears unable to hold a charge,
contact your dealer.
(Canada only)
Your ATV will operate even if the battery is low (or dead), as long as
the engine is running. If the engine is not running, it may be started
using the recoil starter.
1. Shift the shift lever in neutral position.
2. Apply the parking brake.
3. Turn the ignition switch to the “ON” (q) position.
4. Use the recoil starter (page 76) to start the engine.
Taking Care of the Unexpected 219
19 TRX420TM1 FM1_31HR3650.book Page 220 Tuesday, April 3, 2018 11:37 AM
If a Component Fails
The brake levers or pedal, control cables, and other components can
be damaged as you ride in dense brush or over rocky terrain. Making
a trailside repair depends on how serious the damage is and what
tools and supplies you have with you.
• If any component of the brake system is damaged, you may be
able to ride carefully back to your base using the other brake
components for slowing or stopping.
• If you damage a throttle cable or other critical component, your
ATV may be unsafe to ride. Carefully assess the damage and
make any repairs that you can. But if there is any doubt, it’s best
to be conservative and safe.
220 Taking Care of the Unexpected
19 TRX420TM1 FM1_31HR3650.book Page 221 Tuesday, April 3, 2018 11:37 AM
Technical Information
This section contains dimensions, capacities, and other technical
data, plus information on government requirements and how to
break-in your ATV.
Technical Information
Vehicle Identification ................................................................ 222
Specifications ........................................................................... 224
Break-in Guidelines................................................................... 230
Emission Control Systems ......................................................... 231
Oxygenated Fuels ..................................................................... 235
Technical Information 221
19 TRX420TM1 FM1_31HR3650.book Page 222 Tuesday, April 3, 2018 11:37 AM
Vehicle Identification
Serial Numbers
The VIN and engine serial number may be required when ordering
replacement parts. You may record these numbers in the Quick
Reference section at the rear of this manual.
The VIN (1) is stamped on the front of the frame.
FRONT
(1)
(1) VIN
The engine number (2) is stamped on the upper side of the rear
crankcase.
LEFT REAR
(2) engine number
222 Technical Information
(2)
19 TRX420TM1 FM1_31HR3650.book Page 223 Tuesday, April 3, 2018 11:37 AM
Vehicle Identification
Color Label & Code
The color label (1) is attached on the left side of the frame.
The color code is helpful when ordering replacement parts. You may
record the color and code in the Quick Reference section at the rear
of this manual.
LEFT SIDE
(1)
(1) color label
Technical Information 223
19 TRX420TM1 FM1_31HR3650.book Page 224 Tuesday, April 3, 2018 11:37 AM
Specifications
Dimensions
overall length
overall width
overall height
wheelbase
ground clearance
Fuel & Lubricants
fuel
recommendation
fuel tank capacity
fuel tank reserve
engine oil
capacity
engine oil
recommendation
82.8 in (2,103 mm)
47.4 in (1,205 mm)
46.2 in (1,174 mm)
49.9 in (1,268 mm)
7.2 in (183 mm)
unleaded gasoline, pump octane
number of 86 or higher
3.88 US gal (14.7 ℓ)
including reserve
1.29 US gal (4.9 ℓ)
after disassembly:
3.5 US qt (3.3 ℓ)
after draining:
2.7 US qt (2.6 ℓ)
after draining & oil filter change:
2.9 US qt (2.7 ℓ)
API Service Classification SG or
higher except oils labeled as energy
conserving or resource conserving
on the circular API service label, SAE
10W-30, JASO T 903 standard MA,
Pro Honda GN4 4-stroke oil (USA &
Canada), or Honda 4-stroke oil, or
an equivalent motorcycle oil
224 Technical Information
19 TRX420TM1 FM1_31HR3650.book Page 225 Tuesday, April 3, 2018 11:37 AM
Specifications
Fuel & Lubricants (cont’d)
cooling system
Pro Honda HP Coolant or an
recommendation
equivalent high quality ethylene
glycol antifreeze containing
corrosion protection inhibitors
specifically recommended for use in
aluminum engines
cooling system
1.7 US qt (1.6 ℓ)
capacity
Capacities
passenger
capacity
maximum weight
capacity
operator only
485 lb (220 kg)
rider, all cargo and accessories
Engine Specifications
displacement
25.6 cu-in (420 cm3)
bore & stroke
3.406 × 2.815 in (86.50 × 71.50 mm)
compression ratio
9.9 : 1
spark plug
BKR5E-11 (NGK) or
(standard)
K16PR-U11 (DENSO)
spark plug gap
0.039 – 0.043 in (1.00 – 1.10 mm)
intake:
0.006 in (0.15 mm)
valve clearance
(cold)
exhaust:
0.009 in (0.23 mm)
idle speed
1,400 ± 100 rpm
(NO ADJUSTMENT)
Technical Information 225
19 TRX420TM1 FM1_31HR3650.book Page 226 Tuesday, April 3, 2018 11:37 AM
Specifications
Power Transmission
primary reduction
secondary reduction
final reduction
front (Except
TRX420TM1)
rear
transmission ratio
1st
2nd
3rd
4th
5th
reverse
final drive
Chassis & Suspension
caster
2°
trail
0.2 in (5 mm)
tire size, front
AT24 × 8-1211
tire size, rear
AT24 × 10-1111
tire pressure,
front:
front & rear (cold)
4.4 psi (30 kPa)
rear:
4.4 psi (30 kPa)
226 Technical Information
2.103
1.818
3.231
3.154
3.857
2.235
1.571
1.178
0.848
4.831
shaft
MAXXIS M977
MAXXIS M978
19 TRX420TM1 FM1_31HR3650.book Page 227 Tuesday, April 3, 2018 11:37 AM
Specifications
Electrical
battery
generator
Lights
headlight
brake/tail light
neutral indicator
reverse indicator
high coolant
temperature
indicator
PGM-FI indicator
Fuel warning
indicator
(TRX420TM1
only)
YTX14-BS (USA only)
12 V-12 Ah (10HR)
GYZ16H (Canada only)
12 V-16 Ah (10HR)
0.416 kW/5,000 rpm
12 V 35/35 W × 2
LED
12 V 1.7 W ......................TRX420TM1
LED .................................TRX420FM1
12 V 1.7 W ......................TRX420TM1
LED .................................TRX420FM1
12 V 1.7 W ......................TRX420TM1
LED .................................TRX420FM1
12 V 1.7 W ......................TRX420TM1
LED .................................TRX420FM1
12 V 1.7 W
Technical Information 227
19 TRX420TM1 FM1_31HR3650.book Page 228 Tuesday, April 3, 2018 11:37 AM
Specifications
Fuses
main 1
main 2
other
30 A
10 A
20 A × 3, 10 A
228 Technical Information
19 TRX420TM1 FM1_31HR3650.book Page 229 Tuesday, April 3, 2018 11:37 AM
Specifications
Torque Specification
engine oil drain
18 lbf·ft (25 N·m, 2.5 kgf·m)
bolt
engine oil filter
7 lbf·ft (10 N·m, 1.0 kgf·m)
cover bolts
rear final gear oil
9 lbf·ft (12 N·m, 1.2 kgf·m)
drain bolt
rear final gear oil
9 lbf·ft (12 N·m, 1.2 kgf·m)
fill cap
rear final gear oil
9 lbf·ft (12 N·m, 1.2 kgf·m)
level check bolt
front final gear oil
9 lbf·ft (12 N·m, 1.2 kgf·m)
drain bolt (Except
TRX420TM1)
9 lbf·ft (12 N·m, 1.2 kgf·m)
front final gear oil
fill cap (Except
TRX420TM1)
rear brake drain
9 lbf·ft (12 N·m, 1.2 kgf·m)
bolt
wheel nuts
47 lbf·ft (64 N·m, 6.5 kgf·m)
Technical Information 229
19 TRX420TM1 FM1_31HR3650.book Page 230 Tuesday, April 3, 2018 11:37 AM
Break-in Guidelines
Help assure your ATV’s future reliability and performance by paying
extra attention to how you ride during the first operating day or 15
miles (25 km).
During this period, avoid full-throttle starts, rapid acceleration, and
constant rpm operation.
230 Technical Information
19 TRX420TM1 FM1_31HR3650.book Page 231 Tuesday, April 3, 2018 11:37 AM
Emission Control Systems
Exhaust Emission Requirements
The U.S. Environmental Protection Agency (EPA) and Environment
Climate Change Canada (ECCC) require that your ATV comply with
applicable exhaust emissions standards during its useful life, when
operated and maintained according to the instructions provided.
The Vehicle Emission Control Information Label (1) is attached on the
left front of the frame.
The Vehicle Emission Control Information Label (2) is attached on the
left side of the frame.
LEFT FRONT
LEFT SIDE
(1)
(2)
(1) vehicle emission control information label
(2) vehicle emission control information label (Canada only)
Technical Information 231
19 TRX420TM1 FM1_31HR3650.book Page 232 Tuesday, April 3, 2018 11:37 AM
Emission Control Systems
Source of Exhaust Emissions
The combustion process produces carbon monoxide (CO), oxides of
nitrogen (NOx) and hydrocarbons (HC). Control of hydrocarbons and
oxides of nitrogen is very important because, under certain
conditions, they react to form photochemical smog when subjected
to sunlight. Carbon monoxide does not react in the same way, but it
is toxic.
Honda Motor Co., Ltd. utilizes various systems to reduce carbon
monoxide, oxides of nitrogen and hydrocarbons.
Exhaust Emission Control System
The exhaust emission control system includes a PGM-FI system and
oxygen sensor.
No adjustment to this system should be made although periodic
inspection of the components is recommended.
The exhaust emission control system is separate from the crankcase
emission control system.
Crankcase Emission Control System
The engine is equipped with a closed crankcase system to prevent
discharging crankcase emissions into the atmosphere. Blow-by gas is
returned to the combustion chamber through the air cleaner.
232 Technical Information
19 TRX420TM1 FM1_31HR3650.book Page 233 Tuesday, April 3, 2018 11:37 AM
Emission Control Systems
Problems That May Affect ATV Exhaust Emissions
If you are aware of any of the following symptoms, have the vehicle
inspected and repaired by your ATV dealer.
Symptoms:
1. Hard starting or stalling after starting
2. Rough idle
3. Misfiring or backfiring during acceleration
4. After-burning (backfiring)
5. Poor performance (driveability) and poor fuel economy
Federal regulations prohibit removing or disabling a device or
element of design that may affect your engine’s emission
performance unless your ATV will be used exclusively in competition.
If you modify your engine for use in sanctioned competition events,
you must deface or destroy the emission control information label.
If you loan, sell, or give your competition modified Honda ATV to
someone else, under applicable law, you must inform the new
owner/operator in writing that the vehicle is to be used for
competition only.
Technical Information 233
19 TRX420TM1 FM1_31HR3650.book Page 234 Tuesday, April 3, 2018 11:37 AM
Emission Control Systems
Noise Emission Control System
TAMPERING WITH THE NOISE CONTROL SYSTEM IS PROHIBITED:
State laws prohibit, or Canadian provincial laws may prohibit, the
following acts or the causing thereof: (1) The removal or rendering
inoperative by any person, other than for purposes of maintenance,
repair or replacement, of any device or element of design
incorporated into any new vehicle for the purpose of noise control
prior to its sale or delivery to the ultimate purchaser or while it is in
use; or (2) the use of the vehicle after such device or element of
design has been removed or rendered inoperative by any person.
AMONG THOSE ACTS PRESUMED TO CONSTITUTE TAMPERING ARE
THE FOLLOWING ACTS:
• Removal of, or puncturing the muffler, baffles, header pipes or
any other component which conducts exhaust gases.
• Removal of, or puncturing of any part of the intake system.
• Lack of proper maintenance.
• Removing or disabling any emissions compliance component, or
replacing any compliance component with a non-compliant
component.
Fuel Permeation Emission Control System
This vehicle complies with the Fuel Permeation Emission Control
regulations of the U.S. Environmental Protection Agency (EPA) and
Environment Climate Change Canada (ECCC).
The fuel tank, fuel hoses, and fuel vapor charge hoses used on this
vehicle incorporate fuel permeation control technologies.
Tampering with the fuel tank, fuel hoses, or fuel vapor charge hoses
to reduce or defeat the effectiveness of the fuel permeation
technologies is prohibited by federal regulations.
234 Technical Information
19 TRX420TM1 FM1_31HR3650.book Page 235 Tuesday, April 3, 2018 11:37 AM
Oxygenated Fuels
Some conventional gasolines are being blended with alcohol or an
ether compound. These gasolines are collectively referred to as
oxygenated fuels. To meet clean air standards, some areas of the
United States and Canada use oxygenated fuels to help reduce
emissions.
If you use an oxygenated fuel, be sure it is unleaded and meets the
minimum octane rating requirement.
Before using an oxygenated fuel, try to confirm the fuel’s contents.
Some states/provinces require this information to be posted on the
pump.
The following are the EPA-approved percentages of oxygenates for
non-road vehicles:
ETHANOL (ethyl or grain alcohol) up to 10% by volume
You may use gasoline containing up to 10% ethanol by volume.
Gasoline containing ethanol may be marketed under the name
“Gasohol”.
Do not use gasoline containing more than 10% ethanol by volume.
The use of gasoline containing a higher percentage (e.g. E15, E20,
E85) of ethanol has not been approved for use in this vehicle and
may cause starting and/or performance problems and can also
damage metal, rubber, and plastic parts of the fuel system and are
not be covered by the Distributor’s Limited Warranty.
Technical Information 235
19 TRX420TM1 FM1_31HR3650.book Page 236 Tuesday, April 3, 2018 11:37 AM
Oxygenated Fuels
METHANOL (methyl or wood alcohol) up to 5% by volume
You may use gasoline containing methanol containing up to 5%
methanol by volume as long as it also contains cosolvents and
corrosion inhibitors to protect the fuel system. Gasoline containing
more than 5% methanol by volume may cause starting and/or
performance problems. It may also damage metal, rubber, and
plastic parts of your fuel system.
If you notice any undesirable operating symptoms, try another
service station or switch to another brand of gasoline.
Fuel system damage or performance problems resulting from the use
of an oxygenated fuel containing more than the percentages of
oxygenates mentioned above are not covered under warranty.
Oxygenated fuels can damage paint and plastic. Be careful not to
spill fuel when filling the fuel tank. Wipe up any spills immediately.
NOTICE
Oxygenated fuels can damage paint and plastic. Damage caused by
spilled fuel is not covered by warranty.
236 Technical Information
19 TRX420TM1 FM1_31HR3650.book Page 237 Tuesday, April 3, 2018 11:37 AM
Consumer Information
This section contains information on your warranty and how to get
an official Honda service manual.
Consumer Information
Authorized Manuals ................................................................. 238
Warranty Coverage .................................................................. 239
Warranty Service ...................................................................... 240
Contacting Honda .................................................................... 241
Your Honda Dealer ................................................................... 242
Consumer Information 237
19 TRX420TM1 FM1_31HR3650.book Page 238 Tuesday, April 3, 2018 11:37 AM
Authorized Manuals
The Service Manual used by your authorized dealer is available from
your Honda dealer or Helm, Inc. (USA only, Canada: See your dealer
to order authorized manuals.)
Also available but not necessary to service your model is the Honda
Common Service Manual which explains theory of operation and
basic service information for various systems on Honda motorcycles,
scooters, ATVs, SXSs and PWCs.
The Winter Storage Guide in conjunction with the Owner’s Manual
and Service Manual can help you prepare your Honda motorcycle,
scooter, ATV, and SXS for winter.
These Honda manuals are written for the professional technician,
but most mechanically capable owners should find them easy to use
if they have the proper tools and observe proper safety standards.
Special Honda tools are necessary for some procedures.
Publication Item No.
61HR305
61CSM00
S9507
31HR3650
Description
2019 TRX420TM1/TE1/FM1/FM2/FE1/
FA1/FA2 Service Manual
Common Service Manual
Winter Storage Guide
2019 TRX420TM1/FM1
Owner’s Manual
Order On-Line: www.helminc.com
Order Toll Free: 1-888-CYCLE93 (1-888-292-5393)
(NOTE: For Credit Card Orders Only)
Monday - Friday 8:00 AM - 6:00 PM EST
238 Consumer Information
19 TRX420TM1 FM1_31HR3650.book Page 239 Tuesday, April 3, 2018 11:37 AM
Warranty Coverage
Your new Honda is covered by these warranties:
• TRX Limited Warranty
• Emission Control System Warranty
There are responsibilities, restrictions, and exclusions which apply to
these warranties. Please read the Warranties Booklet given to you by
your Honda dealer at the time of purchase. Be sure to keep your
Honda owner’s card with your Warranties Booklet.
Canada: Please refer to the Warranty Booklet posted on our website
at www.honda.ca.
It is important to realize that your warranty applies to defects in
material or workmanship of your Honda. Your warranty coverage
does not apply to normal wear or deterioration associated with using
the ATV.
Your warranty coverage will not be voided if you choose to perform
your own maintenance. However, you should have the proper tools
and service information, and be mechanically qualified. Failures that
occur due directly to improper maintenance are not covered.
Almost all of your warranty coverage can be extended through the
Honda Protection Plan (USA only). For more information, see your
dealer.
Consumer Information 239
19 TRX420TM1 FM1_31HR3650.book Page 240 Tuesday, April 3, 2018 11:37 AM
Warranty Service
Please remember that recommended maintenance interval servicing
is not included in your warranty coverage. Additionally, your
warranty does not apply to the normal wear of items (such as brakes,
tires, etc.).
If you believe you have a problem with your ATV, call the service
department of your dealer. Make an appointment for an inspection
and diagnosis. Remember, as the owner of the ATV, you will be
asked to authorize that inspection. Your dealer will give you the
results of the inspection. If the problem is covered under warranty,
your dealer will perform the warranty repairs for you.
If you have questions about warranty coverage or the nature of the
repair, it is best to talk to the Service Manager of your dealer.
Sometimes, in spite of the best intentions of all concerned, a
misunderstanding may occur. If you aren’t satisfied with your
dealer’s handling of the situation, we suggest you discuss your
problem with the appropriate member of the dealership’s
management team. If the problem has already been reviewed with
the Service Manager, Parts Manager, Sales Manager, etc., contact
the Owner of the dealership or their designated representative.
240 Consumer Information
19 TRX420TM1 FM1_31HR3650.book Page 241 Tuesday, April 3, 2018 11:37 AM
Contacting Honda
Your owner’s manual was written to cover most of the questions
you might ask about your Honda. Any questions not answered in the
owner’s manual can be answered by your dealer. If your dealer
doesn’t have the answer right away, they will get it for you.
If you have a difference of opinion with your dealer, please
remember that each dealership is independently owned and
operated. That’s why it’s important to work to resolve any
differences at the dealership level.
If you wish to comment on your experiences with your Honda or
with your dealer, please send your comments to the following
address:
Motorcycle Division, American Honda Motor Co., Inc., P.O. Box
2200, Torrance, CA 90509-2200, mailstop: 100-4C-7B, telephone:
(866) 784-1870.
Canada: Honda Canada Inc., Customer Relations Dept, 180 Honda
Boulevard, Markham, Ontario L6C 0H9, telephone: (888) 946-6329,
facsimile: (877) 939-0909, E-mail: [email protected].
Please include the following information in your letter:
• name, address, and telephone number
• product model, year, and VIN
• date of purchase
• dealer name and address
We will likely ask your dealer to respond, or possibly acknowledge
your comments directly.
Consumer Information 241
19 TRX420TM1 FM1_31HR3650.book Page 242 Tuesday, April 3, 2018 11:37 AM
Your Honda Dealer
Once you purchase your new Honda, get familiar with the
organization of your Honda dealer so you can utilize the full range of
services available.
The service department is there to perform regular maintenance and
unexpected repairs. It has the latest available service information
from Honda. The service department will also handle warranty
inspections and repairs.
The parts department offers Honda Genuine Parts, Pro Honda
products, Honda Genuine Accessories (USA only), and Honda
accessories and products (Canada only). The same quality that went
into your Honda can be found in Honda Genuine replacement parts.
You’ll also find comparable quality in the accessories and products
available from the parts department.
The sales department offers the Honda Protection Plan to extend
almost all of your warranty coverage (USA only).
Your Honda dealer can inform you about competition and other
riding events in your area. You’ll also find that your dealer is a source
of information about safety training available in your local area.
We’re sure you’ll be as pleased with the service your Honda dealer
continues to provide after the sale as you are with the quality and
dependability of your Honda.
242 Consumer Information
19 TRX420TM1 FM1_31HR3650.book Page 243 Tuesday, April 3, 2018 11:37 AM
19 TRX420TM1 FM1_31HR3650.book Page 244 Tuesday, April 3, 2018 11:37 AM
Index
Index
A
accessories .................................................................................60
age recommendation .................................................................51
air cleaner,
dust cover .............................................................................145
filter ......................................................................................141
housing drain tube ................................................................146
air pressure,
gauge ....................................................................................111
tire ........................................................................................171
American Honda, contacting ....................................................241
apparel, protective ......................................................................48
appearance care .......................................................................186
authorized manuals ..................................................................238
B
bank angle sensor ignition cut-off system ...................................73
battery .....................................................................................181
brake light switch adjustment ...................................................170
brakes,
cables ....................................................................................169
draining water from ..............................................................171
fluid ......................................................................................159
front brake lever ......................................................................40
pad wear ...............................................................................164
P/R lever ...................................................................................41
rear brake lever .......................................................................40
rear brake lever freeplay ........................................................167
rear brake pedal ......................................................................40
rear brake pedal freeplay .......................................................165
shoe wear .............................................................................169
braking .......................................................................................81
break-in guidelines ...................................................................230
244 Index
19 TRX420TM1 FM1_31HR3650.book Page 245 Tuesday, April 3, 2018 11:37 AM
Index
button, mode .......................................................................14, 19
C
capacity, fuel ............................................................................120
care, appearance ......................................................................188
cargo,
loading and operational guidelines ..........................................59
weight limit .............................................................................58
cleaning, appearance care ........................................................188
climbing hills ..............................................................................87
clip ...........................................................................................116
clutch system ............................................................................149
color label ................................................................................227
compartment,
owner’s manual .....................................................................111
tool kit ..................................................................................112
component fails ........................................................................220
consumer information ..............................................................237
controls & features .....................................................................34
coolant temperature gauge ........................................................29
crash, if you ..............................................................................217
crossing or turning on hills or slopes ...........................................91
customer service .......................................................................241
D
digital clock ................................................................................27
dimmer switch, headlight ...........................................................37
dipstick .....................................................................................125
display check ..............................................................................16
display, multi-function ................................................................20
drivetrain boots ........................................................................179
Index 245
19 TRX420TM1 FM1_31HR3650.book Page 246 Tuesday, April 3, 2018 11:37 AM
Index
E
emission control systems ..........................................................231
engine,
flooded ...................................................................................73
guards ...................................................................................177
number .................................................................................222
oil ..........................................................................................120
pinging ..................................................................................117
starting ....................................................................................72
stop switch ..............................................................................36
stopping ..................................................................................75
won’t start ............................................................................206
environment .............................................................................200
exhaust system,
cleaning ..................................................................................56
purging .................................................................................157
F
final gear oil,
front ......................................................................................132
rear .......................................................................................129
flag pole bracket ........................................................................43
flat tire .....................................................................................209
flooded engine ...........................................................................73
front boot guards .....................................................................178
front driveshaft boots ...............................................................180
front driveshaft guards .............................................................178
246 Index
19 TRX420TM1 FM1_31HR3650.book Page 247 Tuesday, April 3, 2018 11:37 AM
Index
fuel,
fill cap ...................................................................................120
gauge ......................................................................................25
oxygenated ...........................................................................235
recommendation ...................................................................117
refueling ................................................................................120
reserve fuel supply .................................................................120
tank capacity .........................................................................120
fuses ........................................................................................213
G
gap, spark plug ................................................................151, 229
gasohol ....................................................................................235
gasoline ....................................................................................117
gear shifting ...............................................................................77
guards ......................................................................................177
H
headlight dimmer switch ............................................................37
headlight switch .........................................................................37
high coolant temperature indicator ...............................14, 17, 211
hills,
crossing or turning on slopes ...................................................91
riding down hills ......................................................................90
riding up hills ...........................................................................86
stopping on hills ......................................................................88
Honda service manual ..............................................................238
Honda,
contacting .............................................................................241
dealer ....................................................................................242
hour meter .................................................................................31
Index 247
19 TRX420TM1 FM1_31HR3650.book Page 248 Tuesday, April 3, 2018 11:37 AM
Index
I
identification, vehicle ................................................................222
ignition switch ............................................................................34
indicators,
4WD indicator .............................................................14, 18, 23
fuel warning indicator .......................................................14, 17
gear position indicator .............................................................24
high coolant temperature indicator ............................14, 17, 211
maintenance minder indicator .................................................32
neutral indicator ................................................................14, 17
PGM-FI indicator ......................................................................17
reverse indicator ......................................................................17
inspection, pre-ride .....................................................................55
K
key,
lost ........................................................................................218
number .................................................................................218
kit, tool ....................................................................................110
L
labels, safety .................................................................................5
lamp check .................................................................................15
lever,
2WD/4WD ...............................................................................35
limit, weight ...............................................................................57
load limits ...................................................................................58
loading guidelines ......................................................................59
lubrication,
engine oil ..............................................................................120
front final gear oil ..................................................................132
rear final gear oil ...................................................................129
248 Index
19 TRX420TM1 FM1_31HR3650.book Page 249 Tuesday, April 3, 2018 11:37 AM
Index
M
maintenance,
component locations .............................................................107
hour meter ..............................................................................32
importance ..............................................................................99
minder indicator ......................................................................32
precautions ...........................................................................101
record ...................................................................................106
safety ....................................................................................100
schedule ................................................................................102
tripmeter .................................................................................32
manual, service .........................................................................238
maximum weight limit ................................................................57
mode button ........................................................................14, 19
modifications ..............................................................................61
multi-function display .................................................................20
N
neutral indicator ...................................................................14, 17
noise emission control system ...................................................238
numbers, serial .........................................................................222
O
obstacles, riding over ..................................................................93
odometer ...................................................................................28
oil,
engine ...................................................................................120
front final gear ......................................................................132
rear final gear ........................................................................129
operation component locations ..................................................11
owner’s manual storage ...........................................................111
oxygenated fuels ......................................................................235
Index 249
19 TRX420TM1 FM1_31HR3650.book Page 250 Tuesday, April 3, 2018 11:37 AM
Index
P
P/R lever .....................................................................................96
passengers, no carrying ..............................................................51
pavement, no riding on ..............................................................65
pinging, engine ........................................................................117
plug, spark ...............................................................................151
pre-ride inspection ......................................................................53
problems, unexpected ..............................................................204
propeller shaft boots & yoke joint boot .....................................179
protective apparel .......................................................................48
R
rear final gear oil ......................................................................129
recoil starter (Canada only) ...................................................38, 76
removal,
rear fender cover ...................................................................115
seat .......................................................................................113
tank cover assembly ..............................................................115
reverse,
assist cable ............................................................................150
assist lever .............................................................................150
gear, shifting into ....................................................................79
indicator ............................................................................14, 17
riding in ...................................................................................79
P/R lever ..................................................................................41
rider training ..............................................................................50
250 Index
19 TRX420TM1 FM1_31HR3650.book Page 251 Tuesday, April 3, 2018 11:37 AM
Index
riding,
basic operation ........................................................................65
clothing ...................................................................................50
over obstacles ..........................................................................93
precautions .............................................................................65
preparing for .........................................................................192
safety ........................................................................................2
safety precautions ...................................................................65
through water .........................................................................94
S
safety,
important precautions ...........................................................101
labels .........................................................................................5
riding precautions ....................................................................65
schedule, maintenance .............................................................102
seat removal .............................................................................112
select lever,
2WD/4WD ...............................................................................35
serial numbers ..........................................................................222
service,
customer ...............................................................................241
manuals ................................................................................238
warranty ................................................................................240
shifting gears ..............................................................................77
skid plate ..................................................................................177
skidding or sliding ......................................................................86
spark arrester ...........................................................................155
spark knock ..............................................................................117
spark plug ................................................................................151
specifications ............................................................................224
speedometer ..............................................................................18
stalled engine .............................................................................74
Index 251
19 TRX420TM1 FM1_31HR3650.book Page 252 Tuesday, April 3, 2018 11:37 AM
Index
stalling on a hill ..........................................................................88
start button ................................................................................36
starting,
engine .....................................................................................72
troubleshooting .....................................................................206
stop switch, engine ....................................................................36
stopping engine .........................................................................76
storage,
ATV .......................................................................................196
owner’s manual .....................................................................111
suspension,
adjustment ............................................................................156
spring pre-load ......................................................................157
switch,
engine stop .............................................................................36
headlight .................................................................................37
headlight dimmer ....................................................................37
ignition ....................................................................................34
T
throttle,
cable .............................................................................147, 150
lever ........................................................................39, 147, 150
tires,
air pressure ............................................................................171
flat ........................................................................................209
repairing ................................................................................175
replacing ...............................................................................176
thread conditions ..........................................................173, 174
tool kit .....................................................................................112
trailer hitch .................................................................................44
252 Index
19 TRX420TM1 FM1_31HR3650.book Page 253 Tuesday, April 3, 2018 11:37 AM
Index
trailer towing,
operational guidelines .............................................................59
weight limits ............................................................................58
training, rider .............................................................................50
transporting your ATV ..............................................................194
tripmeter ....................................................................................28
trouble, unexpected .................................................................203
troubleshooting, starting ..........................................................206
turning,
on hills or slopes ......................................................................91
on level ground .......................................................................84
U
utility pocket ..............................................................................45
V
valve clearance .........................................................................154
vehicle identification no. (VIN) ..................................................222
W
warning labels ..............................................................................5
warranty,
coverage ...............................................................................239
extended ...............................................................................240
service ...................................................................................240
washing your ATV ....................................................................189
water,
draining from brakes .............................................................171
riding through .........................................................................94
weight limit ................................................................................58
wheel removal ..........................................................................209
Index 253
19 TRX420TM1 FM1_31HR3650.book Page 260 Tuesday, April 3, 2018 11:37 AM
Quick Reference
The following is a brief, but important collection of information you
need to know about your Honda. You’ll also find space to record
important notes.
Quick Reference
How To Avoid Costly Repairs
The engine of your Honda can be the most expensive component to
repair. Proper maintenance, especially the use of the recommended
fluids and filters, prevents premature wear and damage.
Frequent causes of costly repairs are:
• Engine oil — insufficient quantity, improper oil.
• Air cleaner — dirty, leaking because of improper installation
(poor seal).
Record important information on the following page:
Quick Reference
19 TRX420TM1 FM1_31HR3650.book Page 261 Tuesday, April 3, 2018 11:37 AM
Quick Reference
Engine No.
VIN
Color Label
Owner’s Name
Address
City/State
Phone
Dealer’s Name
Address
City/State
Phone
Service Mgr.
Quick Reference
19 TRX420TM1 FM1_31HR3650.book Page 262 Tuesday, April 3, 2018 11:37 AM
Quick Reference
Scheduled
Maintenance
Pre-ride
Inspection
Fuel/Capacity
Engine Oil/
Capacity
Maximum
Weight Capacity
Quick Reference
Initial: 100 miles (150 km)
Regular: every 600 miles (1,000 km)
Check the following items each time
before you ride (page 53): engine oil,
radiator coolant, fuel, tires, drivetrain
boots, guards, nuts & bolts, underbody &
exhaust system, air cleaner housing drain
tube, leaks, loose parts, cables, lights,
throttle, brakes, reverse assist lever,
switches, steering.
unleaded gasoline, pump octane number
86 or higher
3.88 US gal (14.7 ℓ)
reserve:
1.29 US gal (4.9 ℓ)
API Service Classification SG or higher
except oils labeled as energy conserving
or resource conserving on the circular API
service label, SAE 10W-30, JASO T 903
standard MA, Pro Honda GN4 4-stroke oil
or equivalent
after draining:
2.7 US qt (2.6 ℓ)
after draining & oil filter change:
2.9 US qt (2.7 ℓ)
485 lb (220 kg)
rider, all cargo and accessories
19 TRX420TM1 FM1_31HR3650.book Page 263 Tuesday, April 3, 2018 11:37 AM
Quick Reference
Tires
Front:
Rear:
Tire Pressure
(cold)
Front:
Rear:
Spark Plugs
Coolant
Fuses
AT24 × 8-1211
MAXXIS M977
AT24 × 10-1111
MAXXIS M978
4.4 psi
(30 kPa)
4.4 psi
(30 kPa)
standard:
BKR5E-11 (NGK) or
K16PR-U11 (DENSO)
ethylene glycol antifreeze (silicate-free)
for aluminum engines in 50/50 solution
with Pro Honda HP Coolant or an
equivalent distilled water
main 1:
30 A
main 2:
10 A
other:
20 A × 3, 10 A
Quick Reference
19 TRX420TM1 FM1_31HR3650.book Page 264 Tuesday, April 3, 2018 11:37 AM
Quick Reference
These symbols are used in Controls & Features section:
SYMBOL
COMPONENT
SEE PAGE
q
ON — ignition switch
34
w
OFF — ignition switch
34
2WD/4WD select lever
35
o
START button
36
e
RUN — engine stop switch
36
r
OFF — engine stop switch
36
y
ON — headlight switch
37
t
OFF — headlight switch
37
u
HI — headlight dimmer switch
37
i
LO — headlight dimmer switch
37
P/R lever:
P — parking brake
41
R — riding in reverse
Quick Reference
19 TRX420TM1 FM1_31HR3650.book Page 265 Tuesday, April 3, 2018 11:37 AM
California Proposition 65 Warning
WARNING
3 WARNING
Operating, servicing and maintaining a
passenger vehicle or off-highway motor
vehicle can expose you to chemicals
including engine exhaust, carbon
monoxide, phthalates, and lead, which
are known to the State of California to
cause cancer and birth defects or other
reproductive harm. To minimize
exposure, avoid breathing exhaust, do
not idle the engine except as necessary,
service your vehicle in a well-ventilated
area and wear gloves or wash your
hands frequently when servicing your
vehicle. For more information go to
www.P65Warnings.ca.gov/passengervehicle.
31HR3650
00X31-HR3-6500
WPCXXXX.2018.XX.19
PRINTED IN USA