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™
Technical Support Information
Length: 28.1" [715mm]
Width: 16.5" [420mm]
Height: 11" [279mm]
Weight: 18.8 lb [8.5kg]
Wheelbase: 18.6" [472mm]
For technical assistance, contact:
DuraTrax Product Support
3002 N. Apollo Drive, Suite 1
Champaign, IL 61822
(217) 398-8970, Ext. 5
carsupport@duratrax.com
ASSEMBLY AND OPERATION MANUAL
Warranty
•
•
•
•
DuraTrax® guarantees this kit to be free from defects in both material and workmanship at the date of purchase. DuraTrax will warranty this
kit for 90 days after the purchase date. DuraTrax will repair or replace, at no charge, the incorrectly made part.
Make sure you save the receipt or invoice you were given when you bought your model! It is your proof of purchase and we must
see it before we can honor the warranty. Further, DuraTrax reserves the right to change or modify this warranty without notice.
In that DuraTrax has no control over the final assembly or material used for final assembly, no liability shall be assumed nor accepted
for any damage resulting from the use by the user of the final user-assembled product. By the act of using the user-assembled
product, the user accepts all resulting liability.
To return your FireHammer for repairs covered under warranty, you should send your buggy to:
Hobby Services
3002 N. Apollo Drive Suite 1
Champaign, Illinois 61822
Attn: Service Department
Phone: (217) 398-0007 9:00 am-5:00 pm Central Time M-F
E-mail: hobbyservices@hobbico.com
If the buyer is not prepared to accept the liability associated with the use of this product, the buyer is advised to return this
kit immediately in new and unused condition to the place of purchase.
READ THROUGH THIS MANUAL BEFORE STARTING. IT CONTAINS IMPORTANT INSTRUCTIONS AND WARNINGS
CONCERNING THE ASSEMBLY AND USE OF THIS MODEL.
Copyright © 2004
DTXZ1069 For DTXD97**
• Do not allow the radio equipment to come into contact
with moisture. Water can cause the electronics to short
out and can cause permanent damage.
TABLE OF CONTENTS
INTRODUCTION ................................................................2
IMPORTANT SAFETY PRECAUTIONS ............................2
ENGINE WARRANTY ........................................................2
GAS ENGINE TIPS ............................................................2
HELPFUL HINTS ...............................................................3
STRESS TECH PARTS GUARANTEE ..............................3
REPAIR SERVICE .............................................................3
SPECIFICATION & DESCRIPTION CHANGES ...............3
REQUIRED ITEMS FOR COMPLETION...........................3
TOOLS NEEDED FOR COMPLETION .............................3
FINISHING THE FIREHAMMER........................................4
PREPARE THE ENGINE....................................................5
RUNNING THE ENGINE ....................................................5
MAINTENANCE TIPS ........................................................6
Before Each Run ........................................................6
After Each Run...........................................................6
After Every 10 Runs ..................................................6
TUNING GUIDE .................................................................6
Caster..........................................................................6
Camber........................................................................7
Front Toe-In and Toe-Out...........................................7
Ride Height .................................................................7
Camber Link Placement ............................................7
Front Shock Adjustment ...........................................7
Rear Shock Adjustment ............................................7
Shock Oils & Shock Springs ....................................7
• Always turn on the transmitter before turning on the
receiver. Before turning on your radio, check to make
sure that no one else is running on the same frequency
as your FireHammer.
ENGINE WARRANTY
The engine is under a limited warranty for 3 years. DuraTrax
warrants this engine to be free from defects in materials and
workmanship for a period of three years from the date of
purchase. During that period, DuraTrax will, at its option,
repair or replace without service charge any product deemed
defective due to those causes.You will be required to provide
proof of purchase date (receipt or invoice).
This warranty does not cover damage caused by crash,
abuse, misuse, alterations or accident. Damaged caused by
customer disassembly, tampering, use of substandard fuel,
use of incorrect accessories (spark plug, etc) or any use of the
engine for which it is not specifically intended will automatically
void the warranty of the engine. If there is damage resulting
from these causes within the stated warranty period, DuraTrax
will, at its option, repair or replace it for a service charge not
greater than 50% of the current retail list value. Be sure to
include your daytime telephone number and e-mail address in
case we need to contact you about your repair.
INTRODUCTION
Thank you for purchasing the DuraTrax FireHammer. This
manual contains the instructions you need to build, operate
and maintain your new, gas-powered R/C buggy. Read
over this manual thoroughly before building or operating
the FireHammer.
Under no circumstances will the purchaser be entitled to
consequential or incidental damages. This warranty gives
you specific legal rights and you may also have other rights,
which vary from state to state.
If you attempt to disassemble or repair this unit yourself, it
may void your warranty.
SAFETY PRECAUTIONS
For service on your DuraTrax engine, either in or out of
warranty, send it postage paid and insured to:
When the safety precautions are followed, the FireHammer
will provide years of enjoyment. Use care and good sense at
all times when operating this radio controlled buggy. Failure
to use this vehicle in a safe, sensible manner can result in
injury or damage to property. You and you alone must insure
that the instructions are carefully followed and all safety
precautions are obeyed.
GAS ENGINE TIPS AND PRECAUTIONS
• Do not use silicone fuel tubing on the model. The gasoline
will attack it. Use vinyl or neoprene rubber fuel line.
• Do not operate the FireHammer near people. Spectators
should be behind the driver or at a safe distance away
from the vehicle.
• Make sure the fuel line is not against the cylinder head.
The heat from the head can damage the fuel tubing.
• Do not leave the charger unattended during charging. If
the battery or charger becomes hot at any time,
disconnect the battery from the charger immediately!
Failure to do so may cause permanent damage to the
charger and battery and may cause bodily harm.
• The engine will be hot after being run. Allow the engine
to thoroughly cool before touching it.
• Do not leave fuel in the tank or lines while transporting.
2
• If the vehicle is not going to be used for a month or so,
the fuel should be drained from the tank and then the
engine run until all excess fuel is used. Leaving fuel in the
vehicle for extended periods of time can cause
premature wear to parts.
REPAIR SERVICE
Repair service is available anytime.
After the 90 day warranty, you can still have your FireHammer
repaired for a small charge by the experts at DuraTrax's
authorized repair facility, Hobby Services, at the address
listed on the front page of this manual.
• Do not operate the vehicle indoors or in an area with
poor ventilation.
• Gasoline is extremely flammable. Keep it away from open
flame, excessive heat or sparks. Do not smoke while
operating the FireHammer.
To speed up the repair process, please follow the instructions
listed below.
❏ 1. Under most circumstances return the ENTIRE system:
• This engine was designed for R/C cars and should not be
used for any other purpose.
buggy and radio. The exception would be sending in a StressTech part. See the instructions under Stress-Tech Guarantee.
❏ 2. Make sure the transmitter is turned off and all of the
batteries are removed.
HELPFUL HINTS
❏
3. Send written instructions which include: a list of all
items returned, a THOROUGH explanation of the problem,
the service needed and your phone number during the day.
If you expect the repair to be covered under warranty, be
sure to include a proof of date of purchase (your store
receipt or purchase invoice).
• Avoid working over a deep pile carpet. If you drop a small
part or screw, it will be difficult to find.
• Place a mat or towel over your work surface.This will prevent
parts from rolling off and will protect the work surface.
❏ 4. Also be sure to include your full return address.
• Avoid running the buggy in cold weather. The plastic and
metal parts can become brittle at low temperatures. In
addition, grease and oil become thick, causing premature
wear and poor performance.
SPECIFICATION & DESCRIPTION CHANGES
• Test fit all parts before attaching them permanently.
All pictures, descriptions and specifications found in this
instruction manual are subject to change without notice.
DuraTrax maintains no responsibility for inadvertent errors
in this manual.
STRESS-TECH™ PARTS GUARANTEE
REQUIRED ITEMS FOR COMPLETION
We have engineered the FireHammer to take the rough and
tumble abuse that makes gas-powered R/C vehicles fun. We
are so confident of the quality and durability of the StressTech plastic parts that we will replace any Stress-Tech
plastic part you break during the first 12 months you own the
buggy. Just send in the part to us and we will send you a
FREE replacement. Please see the FireHammer parts list
for the items covered under the Stress-Tech guarantee.
To operate the FireHammer the following items are required:
❏ 1. Gasoline
❏ 2. 2-Stroke engine oil (to add to the gasoline)
❏ 3. Air filter oil (DTXC2465)
To receive your free replacement part, please send the
following to the Hobby Services address listed on the cover
of this manual.
TOOLS NEEDED FOR COMPLETION
❏ 1. The broken part must be included.
A DuraTrax Spark Plug Wrench is included with this kit for
maintenance and tuning. The following tools are required:
❏ 2. The part number and description of the broken part.
❏ 1. #2 Phillips head screwdriver (DTXR0124)
❏ 2. Needle nose pliers (DTXR0300)
❏ 3. Hobby knife HCAR0105
❏ 4. #11 Blades HCAR0211
❏ 3. Dated copy of your invoice or purchase receipt.
❏ 4. Your name, phone number and shipping address.
3
FINISHING THE FIREHAMMER RTR
❏ 5.
Remove the two 3x12mm (102) screws from the
receiver battery box top (103). Remove the top (103) from
the box bottom (104). Remove the receiver battery from the
FireHammer and charge it using the included charger. Once
the receiver battery is completely charged, re-install it back
into the receiver battery box bottom (104). Secure the
battery in place by re-installing the receiver battery top (103)
and securing it in place with the 3x12mm screws (102).
(See Safety Precautions before charging.)
❏ 1.
Install the transmitter antenna by screwing it into
the hole on the top of the transmitter. Note: After installing
the antenna, give it a good tug to make sure it is
properly installed.
❏ 2.
Slide open the battery door on the bottom of the
transmitter. Install eight (8) "AA" batteries into the
transmitter in the configuration molded into the plastic on
the battery holder. Re-install the battery door.
❏ 6. Remove the 4x8mm screw (77) from the end of the air
cleaner (243) and remove the aluminum cover (245) from
the air filter.
❏ 3. Turn on the transmitter The red and green LEDs on the
side of the transmitter should light up. If there is no light on,
turn the transmitter off and check to ensure that the
batteries are making contact with the metal contacts in the
battery holder. Make sure the batteries are installed
correctly. Turn the transmitter on and check for the red light.
If the red light appears, turn off the transmitter. If the red light
blinks, the batteries are low and should be replaced.
❏ 4. Remove the twist-tie from the receiver antenna. Locate the
antenna tube and thread the receiver antenna through the
antenna tube.The antenna will be longer than the antenna tube.
DO NOT CUT OR COIL THE ANTENNA WIRE. Press fit the
antenna tube into the hole in the chassis. Tip: Run the antenna
wire through your fingers to straighten out the kinks before
running through the antenna tube. Also, applying a small
amount of soap and water to the antenna wire will help
lubricate the wire for threading into the antenna tube.
❏ 7. Remove the air filter element (244) from the air filter
base (243). Soak the air cleaner element with DuraTrax Air
Filter Oil (DTXC2465) and wring out any excess oil from the
element (244).
4
• Always make small adjustment to the needles to prevent
over-adjustment.
• To lean the engine, make a clockwise adjustment to the
desired needle.
• It is not necessary to change the needle settings if the
engine is running smoothly. Normally only the high speed
needle will need adjustment from time to time, and only
a small amount.
IDLE ADJUSTMENT:
Do not confuse the idle screw with the low speed needle. The
idle screw physically adjusts how much the carburetor valve can
close. The low speed needle adjusts the gasoline to air mixture
when the engine is running at low rpm. If your engine appears
to work correctly except that the low rpm are not as low as you
want them to be, then adjust the idle screw. If your engine
behaves erratically at low rpm, then adjust the low speed
needle. When adjusting, turn the screw about 1/8th of a turn
each time. A dirty plug will make it difficult to adjust the idle rpm.
❏ 8. Re-install the air filter assembly back onto the air filter base.
❏ 9. Decal the body as shown on box.
PREPARE THE ENGINE
RUNNING THE FIREHAMMER
BEFORE OPERATION:
• Prepare only the amount of gasoline needed.
• If the engine was just run, make sure you allow enough time
for it to cool down before you run it again. Also, wipe off any
residue the engine may have blown on the FireHammer.
• Fuel the FireHammer with the adequate gasoline mix.
FUELING THE FIREHAMMER
❏ 1. Unscrew the fuel cap (110) from the fuel tank (116).
❏ 2. Pour the proper fuel mixture into the fuel tank.
❏ 3. Thread the fuel cap back into the fuel tank making sure
ENGINE BREAK IN:
• To break in your FireHammer engine, you need to run the
engine for two tanks of fuel with a fuel mixture that
contains a 25:1 (4%) fuel/oil ratio (5oz. per 1 gallon).
• Do not adjust the high-speed needle on the carburetor to
break in the engine. If you do so, carbon will accumulate
in the spark plug and making ignition difficult.
• Do not run at full power for extended periods of time
while breaking in your engine.
• Run the FireHammer with the body off for break in.
that the fuel cap is thoroughly tightened.
❏ 4.
Wipe off any fuel that may have spilled onto the
FireHammer during the fueling process with an old towel.
STARTING THE FIREHAMMER
❏ 1. Turn on the transmitter and then the receiver.
❏ 2. Check the throttle and steering to make sure they are
functioning properly.
RUNNING THE FIREHAMMER AFTER BREAK IN:
• Once the engine is broken in, use 40:1 (2.5%) fuel/oil mix
(3.2oz. per 1 gallon).
ENGINE ADJUSTMENTS:
❏ 3. Prime the engine. Push the primer button until you start
to see fuel in it. Note: Do not press the primer after you
start to see fuel. This will flood the engine and cause it to
be hard to start.
• Always make high and low speed needle adjustments
with the engine shut off.
5
❏ 4. Rotate the choke lever to the closed position.
MAINTENANCE TIPS
❏ 5. Tug on the recoil until the engine starts. (The engine
BEFORE EACH RUN
should start after a few pulls). It may be necessary to slightly
open the throttle to get the engine to start.
❏ 1.Check to make sure that all screws are tight and there
❏ 6. Once
are not any screws missing.
to make sure that the transmitter and receiver
batteries are not low.
the engine starts, return the throttle to neutral
and open the choke back up. Note: If you do not open the
choke after the engine starts, it will probably die quickly.
❏ 2.Check
❏ 3.Check to make sure that all of the moving parts of the
FireHammer move freely and do not bind.
SHUTTING THE FIREHAMMER OFF
To stop the engine press the red shut off switch on the
engine. We recommend that you familiarize yourself with the
switch and what the easiest way is to get to it with the body
on. This way you are not fumbling around to find it in case of
an emergency.
❏ 4.Check for broken or damaged parts. Replace any broken
or damaged parts before running the FireHammer.
Running of the FireHammer with broken or damaged
parts could result in damage to other parts.
❏ 5.Check to make sure that all wires are properly connected
and secure.
FAIL SAFE SET-UP
The fail safe is designed with a signal failsafe and a battery
failsafe. If the receiver loses contact with the transmitter, the
failsafe will set the throttle to the designated position and the
red LED will be constantly lit. If the battery goes below the
preset voltage, the failsafe will set the throttle to the designated
position and the red LED will be constant and the green LED
will flash. If this occurs, shut the FireHammer off and recharge
the receiver battery before running the model again.
AFTER EACH RUN
❏ 1. Clean any large globs of dirt or debris from the chassis
and moving parts.
❏ 2. Drain any remaining gas from the tank.
❏ 3. Check
for any broken or damaged parts. This way
parts may be replaced before the next run.
The fail safe should be set from the factory, but we recommend
that you double check it before running the FireHammer.
❏ 1. Check that the fail safe is functioning properly before
starting the engine.
❏ 2.
AFTER EVERY 10 RUNS
With the receiver on, advance your throttle on the
transmitter. Then shut off the transmitter and see if the
throttle servo moves to the desired position (idle).
❏ 1. Check to make sure that the bearings are free of dirt
and debris and roll smoothly.
❏ 3. Turn on the radio system and make sure the throttle is
❏ 2. Check
the shocks for oil leakage. If the shocks have
leaked any shock fluid out, you should properly refill
the shocks for best performance.
positioned at idle. Press and hold the “SET” button for
2 seconds.
❏ 3. Make
sure the servo saver is free-moving and does
not bind. This will help prevent stripping of the servo
during running. Clean as needed.
SPARK PLUG
The recommended spark plug is a DuraTrax NGK CMR 7H
Spark Plug (DTXG3100). To avoid improper operation or
possible engine damage, do not use any other type of spark
plugs. The plug gap should be .025" to .030" (if the plug gap
is incorrect, adjust it with a spark plug gapping tool, wash it
with gasoline and allow it to dry completely before you
reinstall the plug into the engine).
❏ 4. Check
for proper gear mesh between the spur and
pinion gear.
6
entering a corner. Toe-out will increase steering into corners,
but will decrease the overall stability during acceleration. The
front typically is set-up with 0 to -2 degrees of toe-in.
TUNING GUIDE
When tuning the FireHammer, make sure that you have
equal lengths from one side to the other on the shocks,
camber rods and steering rods. Also, make sure to have the
shock pre-load adjusters at the same setting from left to
right. They do not have to be the same front to rear.
CASTER
Caster refers to the
angle at which the
kingpin is at in relation
to the surface when
viewed from the side.
0-degrees of caster
means that the kingpin
is straight up and down.
RIDE HEIGHT
The ride height of the FireHammer affects how it jumps and
handles. The ride height of the FireHammer is adjustable
through the threaded pre-load adjusters on the shock
bodies. To measure the ride height of the FireHammer, set
the buggy up as if you are ready to run. Push the front of the
buggy down all of the way and release it. When the buggy
returns the front arms should be parallel with the surface.
The rear ride height is set up the same except that the drive
shafts are parallel with the surface. Lowering the front ride
height will increase steering response due to more weight
on the front wheels. Lowering the rear ride height will
increase rear traction and reduce steering response due to
more weight on the rear wheels.
CAMBER
FRONT SHOCK ADJUSTMENT
Moving the tops of the shocks out will increase steering and
quicken reaction. Moving the tops of the shocks in will result
in slower steering reaction, but will be smoother over bumps.
REAR SHOCK ADJUSTMENT
Moving the tops of the shocks in will result in more traction
in the corners and smoother handling over the bumps.
Moving the tops of the shocks out will give the buggy more
steering and better ability to handle large jumps.
SHOCK OILS AND SHOCK SPRINGS
Many different combinations can be used between the
shock oils and shock springs. Some basic guidelines when
setting up the FireHammer are that if the rear end is stiff it
will give the buggy more steering and less rear traction.
Hardening the front will result in less steering and more rear
traction. (Changing the position of the threaded shock preload adjusters results in ride-height change. It does not
change the spring tension).
Camber refers to the angle at which the tire and wheel ride
in relation to the ground when viewed from the front or rear.
Negative camber is when the tire and wheel lean inward and
positive camber is when the tire and wheel lean outward.
Typically you want 0 to -2 degrees of camber. Never put in
positive camber. Make sure that both sides are equal.
FRONT AND REAR TOE-IN AND TOE-OUT
Thinner shock oil makes the shock react faster, but makes
the buggy less stable and may cause the buggy to bottom
out over large jumps. Thicker shock oil makes the buggy
smoother over large jumps and in straights, but less reactive
over rough sections.
1˚ Toe-In
1˚
1˚
Wheels pointed towards each other
Toe-in and toe-out refers to the angle at which the tire is at
when view from above. Toe-in increases stability under
acceleration. However, toe-in also decreases steering when
7
Other Accessories Available From DuraTrax
FlashPoint Infrared Temperature Gauge
DTXP3100
Ultimate Hex Driver Set
DTXR0292
Air Filter Oil
DTXC2465
Ultimate Ball Driver Set
DTXR0297
Standard Screwdriver Set with Pouch
DTXR0140
Transmitter NiCd Conversion Kit
DTXP4010
Transmitter Bag
DTXP2015
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