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Instruction Addendum

Nitro Sport Special Edition (Includes Pro .15 engine with 2-needle carburetor and adjustable slipper clutch).

This addendum contains instructions for the break-in procedure for the TRX

Pro .15 engine and instructions for adjusting the slipper clutch. Settings and procedures in this addendum supercede instructions contained in the printed

Operating Instructions and Quick Start Guide. All other instructions and precautions not pertaining to the topics discussed on this addendum should be followed as outlined in the printed documentation.

The First Tank of Fuel

Drive the Nitro Sport on a flat paved surface in an oval configuration.

This will cause you to naturally vary your speed over the entire RPM range.

During this break in time ease in and out of the throttle slowly to avoid stalling the engine. The goal is to simply keep it running.

High Speed Mixture Setting

The high-speed mixture screw controls how much fuel enters the engine during mid and high-speed operation.Turn the high-speed mixture screw clockwise, by hand, until it stops (Do not tighten or the

needle may be damaged).

Now, turn the mixture screw counter-clockwise 2 1 /

2 complete turns.

NOTE: Your carburetor has been factory preset for break-in. Do not re-adjust your carburetor settings unless you suspect a problem. The following steps are for reference only.

Setting the Idle Speed

The idle screw regulates the throttle opening to control the idle speed. The throttle opening at idle should be set as shown in the drawing. The opening should be 1 to 1 1 /

2 millimeters at the widest point in the opening. The engine may not idle well until it is warmed.

The fuel mixture setting may require slight adjustment to correct for different altitudes and temperature. To tell if the engine is running rich

(high volume of fuel flowing through the engine) look for the following conditions:

1. The engine should accelerate sluggishly

2. There should be a thick trail of blue smoke coming from the exhaust.

3. If you do not observe the conditions above, then turn the high speed needle out 15° (counterclockwise) and retest.

4. Do not rev the engine with the wheels off the ground. High, no-load

RPMs can damage the engine, usually resulting in a broken connecting rod. At the end of the first tank of fuel, stop the engine and allow it to cool for 5-10 minutes before proceeding.

Tanks Two Through Four:

Shut off the engine and allow it to cool for 5-10 minutes, then refuel. Turn the high-speed needle in 15° (clockwise). Turn on the radio system and restart the engine. Continue driving on your oval course, varying your throttle, until the second tank of fuel is used up. Repeat this process for tanks 3 and 4.

2

1

/

2

turns out

Low Speed Mixture Setting

This screw meters the fuel at low speeds.The low-speed mixture screw is located in the end of the carburetor, inside the throttle arm. This screw controls how much fuel enters the engine at idle and low throttle. This adjustment will smooth the idle and improve acceleration to mid-speed.

Make this adjustment with the throttle closed, after setting the idle. Gently turn this screw clockwise until it stops against the needle seat. Be very careful as it is difficult to know when the needle has seated due to the thread holding material on the needle’s thread. Overtightening of the

screw may result in damage to the needle seat. Now turn the low-speed mixture screw counterclockwise 1 3 /

4 turns.

Engine Break In

Follow the normal procedures for preparing your Nitro Sport until you reach the “The First Tank of Fuel” (See page 7 in your Nitro Sport Operating

Instructions or Step 15 in your Nitro Sport Quick Start Guide.) The TRX Pro

.15 engine uses the same basic break-in procedure as the Sport .15 engine, with 2 important exceptions:

1. The Pro carburetor has high-speed and low-speed fuel mixture needles.

The Sport .15 has only a high-speed needle on a restricted carburetor.

The baseline fuel mixture settings for the Pro carburetor are 2 1 /

2 turns out from closed on the high-speed needle and 1 3 /

4 turns out from closed on the low-speed needle. The mixtures were preset at the factory and should not be adjusted until after the engine is running and you are able to observe and evaluate the engine’s performance.

2. There are additional performance tuning steps for the low-speed needle once the engine break-in procedure is completed.

IMPORTANT:

Do not lean the high speed mixture less than

2 turns out from closed

(see illustration). Also, be sure to allow the engine to cool between each run.

2 turns out

Tuning Your Engine for Best Performance

The engine’s performance depends on the fuel mixture. Turn the mixture needles clockwise to lean the fuel mixture and counterclockwise to richen it. Leaning the fuel mixture will increase engine power up to the engine’s mechanical limits. Never run the engine too lean (not enough fuel flow).

Leaning the engine beyond the safe allowable limits will result in poor

performance and engine damage. Indications of an overly lean mixture include:

Cutting out or sudden loss of power during acceleration.

Overheating (temperature beyond 300° at the glow plug)

Little or no blue smoke coming from the exhaust.

Contact Traxxas for assistance: 1-888-TRAXXAS. 972-613-3300 (outside USA). E-Mail us at [email protected]

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If any of these conditions are present, stop immediately and richen the highspeed mixture 1/4 turn. The engine will probably be slightly rich at that setting and you can then retune for performance. Always tune for performance by starting rich and moving toward the ideal setting. Never try to tune from the lean side. There should always be a light stream of blue smoke coming from the exhaust.

Before you begin tuning, the engine should be warmed up to its normal operating temperature and running slightly rich. All final tuning adjustments must be made to the engine at its normal operating temperature. You can tell the engine is running rich by noting any of the following:

Sluggish acceleration with blue smoke coming from the exhaust.

There is unburned fuel spraying from the exhaust tip

Leaning the high-speed fuel mixture increases performance

High-Speed Fuel Mixture Adjustment

With the engine warm and running at a rich setting, gradually lean the highspeed fuel mixture in 1/16 turn increments. Make several high-speed passes with the Nitro Sport after each adjustment to clear out the engine and note any change in performance. Continue this procedure until one of the following conditions exist:

1. There is no longer any performance improvement

2. The engine begins to cut out at high speed

3. There is a sudden loss of power during acceleration

4. The engine begins to overheat. Symptoms of overheating include:

Steam or smoke coming from the engine (not exhaust)

Hesitation or stalling during acceleration

Popping or clattering sound when decelerating

(detonation)

Fluctuating idle speed

Temperature measurement above 300° at the glow plug

If any one of the above conditions occurs, the fuel mixture is already past the maximum safe lean setting. Richen the fuel mixture to the optimum setting by richening the high-speed needle at least 1/8 turn counterclockwise and retest.

This setting will extend engine component life.

Low-Speed Fuel Mixture Adjustment

The low-speed mixture is always set after the high-speed needle is correctly adjusted. The low-speed mixture will be set using the pinch test.

1. Once the engine is warm, do several high-speed runs to confirm that the high-speed needle is set correctly.

2. Bring the vehicle in and pinch closed the fuel line going into the carburetor.

The engine should run for 2-3 seconds, speed up, and then die.

3. It is very important to make several high-speed runs with the Nitro Sport between adjustments to clear out any excess fuel. Perform the pinch test immediately after. If the engine is allowed to idle for a long period of time, it could “load up” with fuel and give you an inaccurate measurement from your pinch test.

4. If the engine runs longer than 3 seconds, then lean the low-speed needle 1/16 turn, make several more high-speed runs, and retest.

5. If the engine dies immediately without speeding up, then richen the lowspeed needle 1/8 turn, make several more high-speed runs, and retest.

6. If the engine dies when you try to accelerate abruptly, then the low-speed needle is probably set too lean. Richen the low-speed needle 1/8 turn, make several more high-speed runs, and retest.

7. When the low-speed needle is set correctly, the engine’s throttle response should be very quick.

Idle Speed Adjustment

Once the high and low-speed mixtures have been set, reduce the idle speed to the minimum reliable idle speed. Remember, this adjustment should be made while the engine is running at normal operating temperature.

1. Turn the throttle trim on the transmitter so that the brakes are applied. This ensures that the throttle barrel is resting against the idle adjustment screw.

2. If necessary, remove the air filter to gain access to the idle adjustment screw.

3. Turn the screw clockwise to reduce the idle speed, or counterclockwise to increase it. The idle speed should be set as low as possible while still maintaining reliable running characteristics.

4. Reset the throttle trim on the transmitter

Fine-Tuning the Carburetor

After fine-tuning your engine at the end of the break-in procedure, no major adjustments to the fuel mixture are usually necessary. Make note of the temperature, humidity, and barometric pressure at the time you finished fine tuning your carburetor. Current weather conditions can be found online from national websites, local TV news websites, and Television. This information will be considered your baseline setting. You may need to adjust your carburetor needles to compensate for changes in temperature and barometric pressure (air density) from day to day. Generally, you’ll need to richen the fuel mixture when the weather is colder than your baseline temperature and the air density is higher. Lean the fuel mixture when weather is warmer than your baseline temperature and the air density is lower. The chart below provides general guidelines on how weather conditions affect air density when they move higher or lower than your baseline setting.

If the...

Humidity

Pressure (barometer)

Temperature

Altitude

Nitro % is..

Lower

Higher

Lower

Higher

Lower

Higher

Lower

Higher

Lower

Higher then the air density is...

Slightly more dense

Slightly less dense

Less dense

More dense

More dense

Less dense

More dense

Less dense the overall mixture should be...

Slightly richer

Slightly leaner

Leaner

Richer

Richer

Leaner

Richer

Leaner

Richer

Leaner

Tuning The Engine By Temperature

The following procedures require an optional infrared temperature probe or on-board temperature gauge (such as the Traxxas on-board digital temperature gauge (part#4090). Engine can be used as an effective tuning aid when you understand the relationship between engine temperature and ambient temperature.

The engine operating temperature, when tuned for maximum performance, will vary according to atmospheric conditions. The atmospheric condition that has the most influence on engine temperature is air temperature. Expect the engine temperature to vary almost in direct proportion to atmospheric temperature.

Assuming you tuned the engine for the same maximum performance each day, the engine will run about twenty degrees hotter when it’s ninety degrees outside than it would in seventy-degree weather. For this reason, we cannot give you a definitive temperature range that indicates the best possible engine tuning.

The temperature gauge can aid you in tuning by giving you a relative indication of how your adjustments are affecting the engine and by preventing you from exceeding maximum engine temperature. For example, as you lean the fuel mixture, the engine performance will increase along with the temperature. If you continue to lean the fuel mixture and the temperature increases but the engine performance does not change, then you have exceeded the maximum safe lean setting.

If tuning for maximum performance results in engine temperature exceeding

300°F, try to increase airflow to the engine by cutting out the rear of the body, windshield, and front valance. If the engine temperature still cannot be kept in check, richen the high-speed needle slightly.

Adjusting the Slipper Clutch

The Nitro Sport Special Edition features an adjustable slipper clutch on the spur gear to protect the drive train from sudden shock loads (such as landing off of jumps with the engine at full throttle). Under normal conditions the sipper clutch should not slip. Before adjusting the slipper clutch, turn the model off. Do not adjust the slipper clutch while the engine is running.

Use the supplied wrench to tighten the slipper nut (clockwise) until it stops and then back the nut out 1/4 of a turn. If you notice any decrease in performance after making changes to the slipper clutch adjustment, then it may be too loose.

The slipper must not be allowed to slip during normal acceleration or the slipper could be damaged.

Contact Traxxas for assistance: 1-888-TRAXXAS. 972-613-3300 (outside USA). E-Mail us at [email protected]

OPERATING INSTRUCTIONS

COVERS MODELS 4504 AND 4510

WARNING!

FOLLOW ALL THE INSTRUCTIONS IN THIS AND THE

ACCOMPANYING MANUALS IN ORDER TO AVOID SERIOUS

DAMAGE TO YOUR MODEL. IF THESE INSTRUCTIONS ARE

NOT FOLLOWED, THE RESULTING DAMAGE WILL BE CON-

SIDERED ABUSE AND/OR NEGLECT, THEREBY RELEASING

BOTH TRAXXAS AND YOUR DEALER FROM ANY FURTHER

WARRANTY RESPONSIBILITY.

INTRODUCTION

Thank you for purchasing the Traxxas Nitro Sport. This manual contains the instructions you will need to operate, and maintain your Nitro Sport. Look over the manual and examine the Nitro

Sport carefully before running it. If for some reason you think

the Nitro Sport is not what you wanted, then do not continue any further. Your hobby dealer absolutely cannot accept a Nitro

Sport for return or exchange after it has been run.

Please read ALL of the Operating Instructions and Precautions before attempting to drive the Nitro Sport. Even if you are an experienced R/C enthusiast, continue reading to learn about Nitro

Sport’s unique features. Pay special attention to the mechanical and safety precautions outlined in the manual.

If you have any questions about your new model, feel free to call Traxxas’ technical support line toll-free at 1-888-TRAXXAS

(1-888-872-9927) Outside the U.S. call 972-613-3300. Technical support is available Monday through Friday, from 8:30 AM to 5:30

PM Central Time. Technical assistance is also available through our website at www.traxxas.com (E-mail us at [email protected]). We hope that you will enjoy many hours of fun with your new Nitro Sport.

FUEL

CAUTION:

ALWAYS FOLLOW THE PRECAUTIONS PRINTED ON

THE CONTAINER OF FUEL. KEEP IT AWAY FROM

FLAMES AND CHILDREN. THE MIXTURE IS FLAMMABLE

AND POISONOUS.

Fuel is the most critical component for making your engine perform properly. Improper fuels will cause hard starting, poor performance, and excessive wear on the engine. For the best performance from your TRX .15 engine, use Traxxas Top

Fuel™. Traxxas Top Fuel™ is the only model engine racing fuel

which exceeds all of the Traxxas engine warranty requirements, is specially formulated to resist heat, and is guaranteed to provide the best performance and longest life from your Traxxas engine. Traxxas cannot guarantee the quality and consistency of other manufacturers’ fuels. If Traxxas Top Fuel™ is not available from your hobby dealer, the fuels listed below have been tested by

Traxxas and determined to be satisfactory for use in the

TRX .15.

Dynamite Blue Thunder

Power Master Formula 16

Byron’s Originals Race 1000/2000

Morgan’s Omega (Omega fuel is an airplane fuel which may be used. The higher oil content however, will not deliver the same performance and tuning ease as a good, special-purpose car fuel)

Some fuels are capable of destroying

your TRX .15 engine! If you must use a fuel

other than those listed, contact TRAXXAS first, at 1-888-TRAXXAS, to find out if the fuel is safe for use with TRX engines.

FUEL BOTTLE

CAUTION:

ALWAYS FOLLOW THE PRECAUTIONS PRINTED ON THE

CONTAINER OF FUEL. KEEP IT AWAY FROM FLAMES AND

CHILDREN. THE MIXTURE IS FLAMMABLE AND POISONOUS.

Fuel is usually purchased by the gallon or quart, so a smaller bottle with a dispensing tube is required to fill the fuel tank. The fuel tank in the Nitro Sport has a capacity of 75cc.

The fuel bottle should always be capped to prevent the fuel from evaporating and becoming contaminated with debris or moisture. The alcohol and nitro contents of the fuel will evaporate, thus upsetting the fuel balance and spoiling the fuel. Do not use old or dirty fuel!

Traxxas #5001-Fuel Bottle

2

PERSONAL SAFETY PRECAUTIONS

Every precaution outlined in this manual needs to be followed to help ensure safe operation. Operate your model sensibly and with care and it will be exciting, safe, and fun for you and your spectators. Failure to operate your model in a safe and responsible manner could result in property damage and serious injury.

You alone must see to it that the instructions are followed and the precautions are adhered to.

The Nitro Sport is not intended for use by children with-

out the supervision of a responsible adult. Traxxas

Corporation shall not be liable for any loss or damages, whether direct, indirect, special, incidental, or consequential, arising from the use, misuse, or abuse of this product and any chemical or accessory required to operate this product.

• The fuel is dangerous and poisonous. Follow all of the directions and precautions on the fuel container.

• The fuel can look like a cool drink to a young child. Keep it out

of children’s reach.

• The fuel is flammable. Do not allow sparks, flame, or smoking in the presence of model fuel.

• The engine emits poisonous carbon monoxide gas. Always run the model in a well-ventilated area. Never attempt to run the engine indoors.

• The engine and exhaust become extremely hot during use.

Be careful not to touch these parts, especially when refueling.

• Do not drive the Nitro Sport at night.

• Never, under any circumstances, operate the Nitro Sport in crowds of people. The Nitro Sport is very fast and could cause injury if allowed to collide with anyone.

• Because the model is controlled by radio, it is subject to radio interference from many sources that are beyond your control. Since radio interference can cause momentary losses of radio control, always allow a safety margin in all directions around the model in order to prevent collisions.

• The engine can be very loud. If the noise makes you uncomfortable, wear ear protection. Be considerate of your neighbors by not running your model early in the morning or late in the evening.

• Most importantly, use good, common sense at all times.

Contact Traxxas for assistance: 1-888-TRAXXAS. 972-613-3300 (outside USA). E-Mail us at [email protected]

7.2v BATTERY PACK AND CHARGER

The EZ-Start™ electric starter requires a

7.2 volt rechargeable nicad battery pack.

The battery pack straps to the bottom of the EZ-Start™ control box with the supplied tie wraps. The battery pack must be fully charged in order to start the engine. It can be recharged with an overnight “wall charger”, a peak-detecting charger, or a 15-minute quick charger. All are available from a hobby dealer.

OTHER REQUIRED EQUIPMENT

To operate the Nitro Sport, you will need these additional items. All of these items should be available from your hobby shop.

1. “AA” size batteries for your transmitter(8) and receiver(4)

2. Small phillips head and flat screwdrivers (for adjustments)

3. After-run oil (to protect the engine from corrosion)

4. Spare glow plugs (standard plug, Traxxas part #3230; or heavy-duty plug, Traxxas part #3231).

5. In-line fuel filter (recommended)

6. Spare fuel line (recommended)

THE TQ RADIO SYSTEM

The Nitro Sport Model 4510 is equipped with the 2-channel TQ radio system. The following radio system terms will be used throughout the rest of these operating instructions.

TWO-CHANNEL RADIO SYSTEM - The radio system in your model consists of the RECEIVER, the TRANSMITTER, and the

SERVOS. It has two channels, one to operate the throttle, and one to operate the steering.

CHANNEL - The 27 MHZ FREQUENCY BAND is divided into 6

CHANNELS, so that up to six cars can be operated simultaneously.

These CHANNELS are referred to by their number and flag color.

The chart below lists the channels and their flag colors.

27MHZ

26.995

27.045

27.095

27.145

27.195

27.255

FLAG COLOR

BROWN

RED

ORANGE

YELLOW

GREEN

BLUE

CH#

1

4

5

2

3

6

TRAXXAS PART#

2031

2032

2033

2034

2035

2036

CRYSTAL (X-TAL) - The CRYSTAL is the plug-in device that determines which channel the RADIO SYSTEM will operate on.

For each CHANNEL, there are two CRYSTALS, one for the

RECEIVER and one for the TRANSMITTER. Of those two

CRYSTALS, the one marked with the lower number (.455 MHZ lower) must be inserted in the RECEIVER.

CLEARING YOUR FREQUENCY - CLEARING your frequency means checking to be sure no one else in the area is operating on the same CHANNEL. You should always do this before operating your model.

NICAD (Ni-Cd) - These terms stand for rechargeable, nickel cadmium batteries. These batteries are most economical and can be recharged up to 500 times.

NEUTRAL POSITION - The NEUTRAL POSITION is the standing position that the SERVOS seek when the TRANSMITTER controls are at neutral.

TRIM - TRIM is the fine-tuning adjustment of the NEUTRAL

POSITION of the SERVOS. This adjustment is made by turning the throttle and steering trim knobs on the face of the TRANSMITTER

Antenna Throttle Neutral Adjust

RED

POSITIVE

BLACK

NEGATIVE

Steering Wheel

Throttle Trim

Steering Trim

ANTENNA

ON/OFF

SWITCH

4-CELL

BATTERY HOLDER

PART# 3170

Throttle Trigger

RECEIVER

Power Switch

Battery

Compartment

CHANNEL-1

CHANNEL-2

BATTERY

CHANNEL-2

THROTTLE

SERVO

Power Indicator

Servo Reversing Switches

Steering (R), Throttle (L)

CH.1

CH.2

WIRE COLORS

BLACK

RED

WHITE

CHANNEL 1

STEERING

SERVO

TRANSMITTER - The TRANSMITTER is the hand-held radio unit which sends throttle and steering instructions to the model.

RECEIVER - The RECEIVER is the radio unit inside the model which receives signals from the TRANSMITTER and relays them to the SERVOS.

SERVO - The SERVOS are the small motor units in the model which operate the steering, and throttle mechanisms.

FREQUENCY BAND - The FREQUENCY band is the radio frequency that the transmitter uses to send signals to the model.

All Traxxas RTR models operate on a 27 MHZ FREQUENCY BAND.

INSTALLING TRANSMITTER BATTERIES

Install 8 “AA” batteries into the bottom of the transmitter as shown in the drawing.

Contact Traxxas for assistance: 1-888-TRAXXAS. 972-613-3300 (outside USA). E-Mail us at [email protected]

3

INSTALLING RECEIVER BATTERIES

The receiver battery holder is located underneath the battery cover. Remove the battery cover by removing the two body clips from the posts on both sides of the battery holder.

Install 4 “AA” batteries into the battery holder. Alkaline batteries should be used. Place the battery holder into the battery cover with the cushioning foam. Secure the battery cover to the chassis using the two body clips as shown.

ANTENNA SETUP

Locate the plastic tube and the antenna tip (supplied in the bag with your instructions). Insert the black antenna wire, extending from the receiver housing, into one end of the tube and push it all the way through. Spray the wire with glass cleaner to make it easier to insert.

RADIO SYSTEM OPERATION

Your radio system was pre-adjusted before it left the factory, however, the adjustment should be checked prior to running the truck.

1) Before you ever turn your radio system on, you must “clear” your frequency. There are six different channels numbered 1 through 6. Each of the six channels is represented by a color.

Look at the crystal in the back of the transmitter to determine which of the channels your truck is operating on. Clearing your frequency means checking to be sure that no one else in the area is operating on the same channel.

2) TIP: Always turn the transmitter on first and off last. This will prevent the model from receiving stray signals and running out of control. Slide the transmitter switch to the “on” position. A steady red light should illuminate. A flashing

red light indicates weak bat-

teries. Weak batteries will limit

the range of the radio signal between your transmitter and receiver. Loss of the radio signal can cause you to lose control of the truck.

3) Turn the truck on. The switch is located on the chassis. The servos should jump and move to their idle (neutral) positions.

Insert the tube into the antenna mount in the side of the chassis.

Fold the remaining antenna wire over the top of the antenna tube and secure it with the vinyl antenna tip.

Under no circumstances should you ever cut your antenna wire.

Its length is specially tuned to the frequency band, and cutting it could severely shorten the radio’s range. On the transmitter, fully

extend the chrome telescopic antenna.

RADIO SYSTEM ADJUSTMENTS

• THROTTLE NEUTRAL ADJUST

The throttle neutral adjustment is located on the transmitter face and controls the forward and reverse travel of the throttle trigger. There are two settings, 50/50 which allows equal travel for both forward and brake, and 70/30 which allows more travel for throttle and less for brake. Change the adjustment by pressing the button and sliding it to the desired position. 70/30 is the recommended setting while running the Nitro Sport.

• SERVO REVERSING SWITCHES

On the front of the transmitter there are two switches. One for throttle and one for steering. Moving the switches reverses the direction of the corresponding servos. For example, if you turn your steering wheel right and the model moves left, then switch the steering servo reversing switch to correct the servo direction. You may need to adjust the corresponding trim control after moving the servo-reversing switch.

4

50%

FORWARD

50%

REVERSE

TOTAL TRIGGER

MOVEMENT

Contact Traxxas for assistance: 1-888-TRAXXAS. 972-613-3300 (outside USA). E-Mail us at [email protected]

NEVER TURN THE TRANSMITTER OR RECEIVER OFF

WHILE THE ENGINE IS RUNNING. THE MODEL COULD

RUN OUT OF CONTROL. (The on/off switch only turns the receiver on and off. It does not turn off the engine.)

4) With the front wheels off the ground, operate the steering control on the transmitter (channel 1). Check for rapid operation of the steering servo and that the steering mechanism is not loose or binding. If the servo operates slowly, check for weak batteries.

Turn the “steering trim” control on the transmitter to adjust the servo so that the front wheels are pointing straight ahead. Check to be sure that the wheels do not turn more in one direction than in the other.

FRONT

0˚ TOE-IN

Wheels pointing straight ahead

5) Operate the throttle trigger on the transmitter to ensure that the throttle servo is operating properly. When the servo is in the neutral position, the carburetor should be in its idle position

(you will adjust the engine idle speed later). When the throttle trigger is pulled all of the way, the carburetor should be in the fully open position. When the throttle lever is pushed forward, the brake should be locked and the throttle should not close any further than when at idle.

STARTING THE ENGINE

STEP 1: INSTALL THE AIR FILTER

Remove the protective cap from the carburetor air intake. Install the rubber air filter base and pre-lubed foam element onto the carburetor intake. The foam air filter element may be cleaned and reused. Always be sure the filter element is oiled properly

before running the engine. For the best filtration, use the type of oil made for foam air filters. It should be available locally from motorcycle shops and small engine repair shops. Lightweight motor oil or after-run oil may also be substituted. When the element gets dirty, clean it with dish soap and rinse. Next, saturate it with oil and then squeeze out the excess oil. For extremely dusty conditions, special two or threestage, pre-lubed filters are available from

Traxxas (Part #4062 and #4063).

STEP 2: FILL THE FUEL TANK

Use a small fuel bottle or bulb to put fuel into the tank. Only fill the tank to the bottom of the fill neck. The Nitro Sport can be carefully refueled while the engine is running.

STEP 3: HIGH-SPEED MIXTURE SETTING

HIGH SPEED

NEEDLE

AIR

FILTER

RANGE TEST THE RADIO

There are many things such as buildings, power lines, radio transmitters, etc. which can adversely affect the performance of your radio system. To make sure you do not have a “runaway” model, range test the radio system. With the radio system on and working, hold the truck and have a friend carry the transmitter away from you the distance you plan to run the truck. Have the friend operate the controls on the transmitter to be sure that everything is working at full range.

PREPARING TO RUN

• INSTALLING THE EZ-START BATTERY

Note: Your carburetor has been factory preset for break-in. Do not readjust your carburetor settings unless you suspect a problem. The following steps are for reference only.

Use tie wraps to secure a

fully-charged 7.2 volt battery back to the EZ-

Start control box. Plug the battery connector into the face of the control box. The plug will only go in one way.

The high-speed mixture screw controls how much fuel enters the engine during mid and high-speed operation. Turn the highspeed mixture screw clockwise, by hand, until it stops (Do not

tighten or the needle may be damaged). Now, turn the mixture screw counter-clockwise 1

3 /

4 complete turns.

STEP 4: SETTING THE IDLE SPEED

Contact Traxxas for assistance: 1-888-TRAXXAS. 972-613-3300 (outside USA). E-Mail us at [email protected]

5

The idle screw regulates the throttle opening to control the idle speed. The throttle opening at idle should be set as shown in the drawing. The opening should be 1 to 1 1 /

2 millimeters at the widest point in the opening. The engine may not idle well until it is warmed.

STEP 5: PRIME THE ENGINE

Before starting your engine, review the safety and driving precautions in this manual.

1) Turn the radio system on (transmitter then receiver). Place the

truck against a curb or some other immovable object to prevent it from moving forward.

2) Press the start button on the EZ-Start to turn over the engine.

Do not hold for more than 5-10 seconds to start the engine.

Once the engine has started, it may be necessary to continue to hold the start button to keep the plug lit until the engine has warmed up.

Note: The red LED on the EZ-Start will light when the start

button is pressed. This indicates that the glow plug is hot

(ignited). If the LED does not light, make sure that the glow plug connector (blue wire) is firmly attached to the glow plug.

If the connection is secure, and the LED still does not light, replace the glow plug with a Traxxas, standard plug #3230.

3) If the engine did not start in step 2, prime it again and retry.

Continue this sequence until the engine starts.

BREAKING-IN THE ENGINE (VERY IMPORTANT!)

Connect the plug from the EZ-Start control box into the connector mounted at the rear of the truck. The plug is keyed so it will only insert one way.

Closely watch the fuel line going into the carburetor. Hold your finger over the exhaust outlet and press the button on the EZ-

Start until the fuel moves through the fuel line towards the carburetor. Once fuel reaches the carburetor, STOP. If you press the

EZ start button too long, you will flood the engine and the EZ-

Start will not be able spin it over (see page 10). With a full tank of fuel, it will only take a second to move the fuel up to the carburetor.

CAUTION:

TRX ENGINES MUST BE BROKEN-IN FOR MAXIMUM LIFE

AND HIGHEST LEVEL OF PERFORMANCE. THIS PROCESS

MUST NOT BE SKIPPED. A SHORTCUT HERE COULD

SHORTEN THE ENGINE LIFE.

Once your engine is running, it must be broken-in. The key to breaking in your engine is patience. The break in time will take

about 1 to 1 1 /

2

hours. During the break-in period, your engine may appear to malfunction with symptoms such as stalling, inconsistent performance, and fouled glow plugs. Don’t give up on it! These are just “break-in pains” that every new engine has to go through. They will disappear once you get through the break in period. Just keep it running, and throttle on and off

as smoothly as you can. Sudden bursts or releases of the

throttle can stall your engine. Resist the temptation to tune the

engine for performance and/or run for extended times at wide open throttle. Soon, after about the fourth tank of fuel, your patience will pay off with solid, consistent, performance.

DURING BREAK IN...

• Special break-in fuels are not required.

• Drive the model on a smooth hard surface.

• If possible, avoid running on very hot, humid days.

• Run with the body off for extra engine cooling.

• Do not allow the fuel tank to run completely empty, possibly leading to a burned plug. An extremely low fuel level causes the fuel mixture to be too lean.

• Keep extra glow plugs handy. The break-in process, because of the engine running rich, can cause deposits to form on the glow plug, leading to failure.

• Turn the mixture screw (needle) clockwise (in) to lean the mixture and counter-clockwise (out) to richen the mixture.

Watch closely for the fuel to stop at the inlet

STEP 6: SHUT-

TING OFF THE

ENGINE

Before starting the engine it is important to know how to shut it off. The correct method is to pinch and hold the carburetor’s fuel line at idle speed, until the engine dies.

STEP 7: START THE ENGINE

DRIVING PRECAUTIONS

6

• The radio system is not waterproof. Avoid driving through puddles, wet grass, or mud. Water could damage the electronics.

• Do not continue to operate the Nitro Sport with low batteries. After the battery power drops below a certain point, the model will continue with the last command it had from the transmitter.

Indications of low battery power include slow operation and sluggish servos. On the transmitter, a flashing red light indicates low transmitter batteries.

• Do not drive the Nitro Sport at night, on public streets, or in large crowds of people.

• If the truck becomes stuck, do not continue to run the engine.

Remove the obstruction before continuing to drive.

• Do not attempt to push or tow objects with the Nitro Sport.

• The model is controlled by radio. It is subject to radio interference from many sources beyond your control. Since radio interference can cause momentary losses of control, allow a safety margin around the truck in order to prevent collisions.

• Use common sense whenever you are driving your model.

Intentionally driving in an abusive and rough manner will only result in poor performance and broken parts.

Contact Traxxas for assistance: 1-888-TRAXXAS. 972-613-3300 (outside USA). E-Mail us at [email protected]

THE FIRST TANK OF FUEL

• Drive the Nitro Sport on a flat paved surface in an oval configuration. This will cause you to naturally vary your speed over the entire RPM range. During this break in time, ease in and out of the throttle slowly to avoid stalling the engine. The goal is to simply keep the engine running.

TANK SIX AND BEYOND

• All final tuning adjustments must be made to the engine at its normal operating temperature.

• The engine’s performance depends on the fuel mixture. Leaning the fuel mixture with the high-speed needle (turning clockwise) will increase engine power up to engine’s mechanical limits. Leaning the fuel mixture beyond the safe allowable limits will result in poor performance and engine damage.

Tanks 4 & 5: +

1

/

8 turn (45

0

)

Tank 6: + 1 /

16 turn (22.5

0

)

Maximum lean setting. Engine begins losing power.

Richen mixture -

1

/

16 turn

High-Speed Power Loss

Overheating

LEAN

DANGER

RACING

Optimum for High-Speed

Performance

Optimum for Climbing

& Low Speed

Operation

EVERYDAY

RUNNING

SAFE RANGE

• The fuel mixture setting may require slight adjustment to correct for different altitudes and temperatures. To tell if the engine is running rich (high volume of fuel flowing through the engine) look for the following conditions:

1) The engine should accelerate sluggishly

2) There should be a thick trail of blue smoke coming from the exhaust.

• If you do not observe the conditions above, then turn the high speed needle out 15° (counterclockwise) and retest.

• Do not run at full speed during the first tank of fuel.

• Do not rev the engine with the wheels off the ground. High, no-load RPMs can damage the engine, usually resulting in a

broken connecting rod. At the end of the first tank of fuel, stop the engine and allow it to cool for 5-10 minutes before proceeding.

TANKS TWO & THREE

Tank 1: Rich setting (1 3 /

4 turns out)

Tanks 2 & 3: + 1 /

8 turn (45

0

)

Turn the mixture screw in (clockwise) 45-degrees ( 1 /

8 of a turn), refill the fuel tank, prime the engine, and restart as above. Run two tanks of fuel through the engine at this setting. Allow the engine to cool 5-10 minutes between tanks. Continue to vary your speed as you did with the first tank of fuel, occasionally reaching full throttle.

Important: Do not lean the high speed mixture less than 2 turns out from closed (see illustration). Also, be sure to allow the engine to cool between each run.

TANKS FOUR AND FIVE

Turn the mixture screw in (clockwise) 45-degrees ( 1 /

8 of a turn), refill the fuel tank, prime the engine, and restart. Once again, run two tanks of fuel through the engine at this setting. Allow the engine to cool 5-10 minutes between tanks.

RICH

Sluggish Performance

Break-In Settings

• After the fourth tank of fuel, the break in process should be complete. Now its time to tune the engine for maximum power.

• Turn the mixture screw in (clockwise) 1/16 of a turn and continue driving. Note any increase in speed and performance.

• Continue to lean the fuel mixture in 1/16 turn increments until :

1) There is no longer any performance increase or

2) The engine begins to cut out at high speed or

3) The engine begins to overheat. Symptoms include:

• Steam or smoke coming from the engine surfaces

• Hesitation during acceleration (as if running out of fuel)

• Popping or clattering sound when decelerating (detonation)

• The idle speed will fluctuate

• Any of the above symptoms indicate that the fuel mixture is past the maximum safe lean setting. Turn the mixture screw back out

(counterclockwise) the previous 1/16 of a turn to reach the optimum fuel mixture setting.

• Turn the mixture screw out another 1/16 of a turn for non-race applications. This will extend engine component life. This setting will vary slightly with each engine depending upon fuel brand,

SETTING THE IDLE SPEED

Now that the engine mixture is tuned, the idle speed may be set too high. Only set the idle speed when the engine is at its normal operating temperature. Adjust the throttle trim on the transmitter so that the brake on the truck is applied. Next, reset the idle speed by removing the air filter and adjusting the idle speed screw on the side of the carburetor (see drawing on page 5). Turn the screw out (counter-clockwise) to reduce the idle. Re-adjust the throttle trim on the transmitter as necessary (so that the brake is no longer applied). The idle should be set slow enough that the truck does not try to move at idle.

Contact Traxxas for assistance: 1-888-TRAXXAS. 972-613-3300 (outside USA). E-Mail us at [email protected]

7

ADJUSTMENTS

• TOE IN

Geometry and alignment specs play an important roll in your truck’s handling, so take the time to set them correctly. Set the steering trim on your transmitter to neutral. Now, adjust your tie rods so that both wheels are pointing straight ahead and are parallel to each other (0 degrees toe in). This will ensure the same amount of steering in both directions. If you run out of adjustment, then the steering servo will have to be re-centered (see

“centering your servos on page 9). For increased stability add

1-2 degrees of toe in to each front wheel. Use the turnbuckles to adjust the alignment.

TOE IN

• CAMBER

The camber angle of both the front and rear wheels can be adjusted with the camber rods (upper turnbuckles). Use a square or right-angle triangle to set the camber accurately. Adjust the front wheels to 0 degrees of camber (wheel perpendicular to the ground). In the rear, adjust the wheels to 1 to 2 degrees of negative camber. These adjustments should be set with the truck positioned at its normal ride height.

shop). The thinner viscosity oils

(30W or less) flow more smoothly and are more consistent, while thicker oils provide more dampening.

Use only 100% pure silicone shock oil to prolong seal life.

The ride height for Nitro Sport can be adjusted by adding or removing the clip-on spring preload spacers. Instead of adding spacers to increase stiffness, use stiffer springs. Adjust the

PRE-LOAD

SPACERS

ride height so that the suspension arms are slightly above being parallel to the ground. Observe how the Nitro Sport handles in turns.

If it is picking up the inside rear wheel in hard turns, then stiffen the front suspension. If it picking up the inside front wheel in hard turns, then stiffen the rear suspension. Proper set-up will add stability and help prevent roll-overs.

• GEAR RATIOS

A unique Nitro Sport feature is the ability to change the gear ratios. The final drive ratio of the gearbox is 2.81 to 1. Use the following formula to calculate the overall ratio:

Number of Spur gear teeth

Number of Clutch bell gear teeth x 2.81 Final drive ratio

Nitro Sport comes with a 70-tooth spur gear and an 20-tooth pinion (clutch bell) gear. This combination will provide the best overall acceleration and top speed. If you want more acceleration and less top speed, then use a smaller clutch bell gear (fewer teeth). For more top speed, use a larger clutch bell gear.

Positive camber Negative camber

SHOCKS

The four shocks on Nitro Sport have the most influence on its handling. Whenever you rebuild your shocks, or make any changes to the pistons, springs or oil, always do it carefully and in pairs (front or rear). Piston head selection depends on the range of oil viscosities that you have available. For example, using a two-hole piston with a lightweight oil will, at one point, give you the same dampening as a three-hole piston with heavier oil. We recommend using the two-hole pistons with a range of oil viscosities from 10W to 50W (available from your hobby

PINION SPUR GEAR FINAL DRIVE

22 ..................................66................................8.43:1

22 ..................................70................................8.94:1

22 ..................................72................................9.19:1

20 ..................................70................................9.83:1

20 ..................................72..............................10.11:1

18 ..................................70..............................10.92:1

18 ..................................72..............................11.24:1

16 ..................................70..............................12.27:1

16 ..................................72..............................12.64:1

TOP SPEED

ACCELERATION

8

1) Check the wheels and steering for binding. Check the operation of the shock absorbers.

2) Check the wiring for any frayed wires or loose connections, including the wires on the EZ-Start quick connector. Fraying or melting of the blue wire on your EZ Start system can cause your glow plugs to immediately short out.

3) Check the tightness of the grub screws in the collars on the throttle and steering linkages.

4) Check the air filter for proper mounting and filtration.

5) Check the mounting of the receiver and servos.

6) Check the tightness of the wheel nuts with a wrench.

MAINTENANCE

7) Check the fuel tank and all hoses for signs of leaks.

8) Check the operation of the radio system, especially the condition of the batteries.

9) Check the exhaust system for leaks, cracks, or tears. Do not run the model if there are any exhaust leaks.

10) Use Traxxas Nitro Wash spray cleaner to keep the model clean of accumulated dirt and oil. Do not spray any radio components with Nitro Wash. Do not spray Nitro Wash into a dirty air filter while it is installed on the engine.

11) The steering servo saver will wear out over time. If the steering becomes loose, the servo saver should be replaced.

Contact Traxxas for assistance: 1-888-TRAXXAS. 972-613-3300 (outside USA). E-Mail us at [email protected]

• CHANGING THE CLUTCH BELL AND SPUR GEARS

Remove the rubber exhaust pipe and the tuned pipe. Remove the electric starter drive. Loosen the four 3x8mm caphead screws which hold the slotted adjusting plates to the engine mount.

Remove the 4mm nylon locknut and the spring from the spur gear.

Remove the spur gear from the shaft.

INSTALLING A RADIO SYSTEM (Model 4504)

Before installing the radio system center your servos as described in your radio system’s operating instructions. Note: the plug on the Traxxas 4-cell battery holder is compatible with

Traxxas and Futaba radio systems. Some Airtronics, Sanwa,

and Novak receivers require that the positive and negative

leads in the plug be reversed. Refer to your radio system’s schematic to ensure that the polarity is correct.

The splines inside the steering servo saver and the throttle servo arm are compatible with Traxxas and Futaba servos. Other brands of servos may not fit properly and require you to purchase a compatible servo saver and servo arm. The designs are an industry standard so it should not be difficult to locate identical parts that will fit your servos.

Install the radio system components and hook up the linkages as shown in the drawings on the right. Route your wires neatly to prevent them from being damaged.

Remove the large E-clip on the clutch shaft and the clutch bell gear. Remove the ball bearings and install them in the new clutch bell gear. Reinstall the clutch bell gear and E-clip. Note: Smaller clutch bell gears use smaller ball bearings. Refer to your parts list for the correct bearings. Reinstall the spur gear on the top shaft and secure it with the 4mm locknut.

Slide a strip of thin note paper

CENTERING YOUR SERVOS

between the spur gear and the clutch bell gear. Push the clutch bell gear against the spur gear and tighten the 3x8mm adjusting plate screws. Remove the paper and the gear mesh should be correctly adjusted.

Whenever your radio system has been removed for service or cleaning, the servos must be re-centered prior to installing the radio system in the model. If the radio system is installed in the truck, disconnect the servo horns from the servos.

Connect the steering servo to channel 1 on your receiver and the throttle servo to channel 2. The white wire on each servo cable is positioned towards the crystal. Connect the red and black cable from the battery holder to the “batt” terminal on the receiver. The red wire is positive and the black wire is negative.

Place fresh “AA” batteries in the transmitter and turn the power switch on. Slide the throttle and steering trim adjustments to to the center position. Now install fresh “AA” batteries into the battery holder and turn the power switch to the on position. The servos will automatically jump to their center positions.

Turn off the battery holder switch followed by the transmitter.

The servos are now ready to be installed. Be careful not to move the servo shaft when reinstalling the servo horns.

STORAGE

After running your Nitro Sport, use a good “after-run” product prior to storage. The chemicals used in the fuel attract moisture and can cause moisture and corrosion to form inside the engine.

Drain the fuel tank, start the engine and run it until all of the remaining fuel is completely used up. Remove the air cleaner and place the recommended number of drops (usually 6 drops) of the after-run oil into the carburetor. Now, spin the engine for 2-3 seconds with the EZ-Start to circulate the oil. Replace the air cleaner. Never store your model with unused fuel in it.

Contact Traxxas for assistance: 1-888-TRAXXAS. 972-613-3300 (outside USA). E-Mail us at [email protected]

9

LIMITED WARRANTY INFORMATION

Every effort has been made in component design and material selection to make your Nitro Sport as durable as possible. Because the model is intended to be a hobby-class model and operate at a much higher level of performance than a “toy,” no warranties can be expressed or implied relating to the longevity of the parts. Parts will wear out and require replacement. If any part of the model appears to be defective, or incorrectly assembled when it is new

(before it is used), it will be repaired or replaced at Traxxas’ discretion.

This warranty will not cover damage from wear, abuse, neglect, crashes, or water.

• TO OBTAIN WARRANTY SERVICE

If it has been determined that your model is somehow defective, return it to Traxxas with a note describing the problem, and a copy of the purchase receipt or invoice. Do not return to Traxxas without first speaking with a service technician, toll-free, at 1-888-

TRAXXAS. Drain all fuel and remove all batteries. Remember that the warranty only covers brand new products which are defective right out of the box. All other service or exceptions will be estimated on an individual basis.

The radio system that is provided with the ready-to-run models is covered by separate warranty on a separate page (included in your documentation package). The radio system warranty does not cover water damage. Due to the special nature of the TRX .15

engine, it is also covered by a separate warranty page provided with your model.

Be sure to include a return address and a daytime phone number.

MAIL OR SHIP TO:

TRAXXAS CORPORATION

12150 SHILOH ROAD

DALLAS, TEXAS 75228

Traxxas corporation reserves the right to make changes, modifications, and improvements to this product without notification, and which may not be reflected in these documents. Upgrades and improvements are not necessarily retroactive. Traxxas may not provide improved or updated components free of charge for models built prior to any change in specification.

For technical assistance regarding your model, call (888) TRAXXAS (872-9927),

(972) 613-3300 (outside of the U.S.A.), or E-Mail Traxxas at [email protected]

For orders and other information, call (972) 613-3300 or fax (972) 613-3599.

ENGINE TROUBLE SHOOTING

The troubleshooting guide on the following page has been provided to help you in diagnosing and repairing common engine problems. Most difficulties with engines can be traced back to problems with adjustment, fuel quality, dirt blockage, or common parts that wear with everyday use.

FLOODED ENGINE

The engine can become flooded if it is primed too many times during the course of a routine start up. When the engine is flooded, the EZ-Starter cannot turn the engine and it will appear to be locked. Use the following procedure to clear a flooded engine.

• Remove the blue glow plug wire

• Remove the glow plug with a 5/16 nut driver

• Plug in the EZ Start and turn the truck upside down

• Push the EZ-Start button for several seconds to clear the excess fuel from the combustion chamber

• Turn the truck over and re-install the glow plug with gasket

• Reconnect the blue glow plug wire

• Remove one of the motor wires from the EZ-Start motor

• Push the EZ-Start button for several seconds. This lights the glow plug and burns off any remaining fuel

• Reconnect the EZ-Start motor

• Do not prime the engine. Partially open the throttle and press the EZ-Start button. The engine should start immediately.

GLOW PLUGS

while pressing the EZ-Start button. The glow plug will not light unless it is grounded against the engine. Glow plugs can be damaged by particles in the combustion chamber or by running the fuel mixture excessively lean.

Traxxas makes 2 glow plugs. The standard hot plug

(part#3230) is the stock replacement plug for Traxxas engines.

The optional heavy-duty plug (part#3231) will last longer in most cases however, it is a medium temperature plug so performance may be reduced slightly. Do not use plugs with idle bars!

CARBURETOR

Dirt is the main enemy to your carburetor. If you notice a sudden change in the fuel mixture (lean) and performance of your model, you may have dirt lodged in the carburetor. To dislodge a dirt particle in your carburetor try screwing the high speed needle all the way in and then back out to its original settings. If the engine doesn’t return to normal operation, then try backing the mixture screw out and prime the engine to force fuel through the carburetor. Return the mixture screw back to its original settings.

The engine will be flooded at this point so follow the directions for relieving a flooded engine. If this fails, then the carburetor will need to be removed and cleaned with Traxxas Nitro Wash or denatured alcohol. Do not blow on carburetor passages or fuel lines with your mouth. Fuel and solvents are extremely poisonous. To prevent this from occurring again, insert a fuel filter in the line between the tank and the carburetor.

EZ-START

The glow plug in your engine is a consumable item which must be replaced periodically to maintain peak performance and starting ease. To test for a leaking glow plug, place a few drops of fuel around the the base of the glow plug when the engine is cool. With the engine running, look for bubbles around the glow plug. If the gasket is leaking, tighten the plug or replace the gasket.

The EZ-Start control box has an LED which lights to indicate the condition of the glow plug. If the LED does not light when the button is pressed, then the glow plug element is broken.

However, glow plug performance can deteriorate significantly before the element actually burns in two. The only sure way to

test for a faulty glow plug is to replace it with a new one to

see if the problem goes away. You can view the glow plug element by removing it and touching it against the engine head

10

The battery to the EZ-Start must be fully charged for the best performance. If the battery is weak, the EZ-Start may appear to be spinning the engine fast enough to start however, there is not enough current to adequately light the glow plug. If the EZ-Start appears to spin normally, but doesn’t seem to “catch” and spin the engine adequately, then inspect the one way bearing inside the starter. If it becomes saturated with castor oil from the engine fuel, then it will slip on the starter shaft. Clean or replace the one way bearing. If there is excessive gear noise, then suspect broken gears inside the EZ-Starter. If the EZ-Start motor spins freely with no gear noise, then the motor pinion gear may be stripped. If this occurs, then the EZ-Start motor assembly must be replaced.

The pinion gear is pressed on, and not available separately.

Contact Traxxas for assistance: 1-888-TRAXXAS. 972-613-3300 (outside USA). E-Mail us at [email protected]

ENGINE TROUBLESHOOTING GUIDE

Engine will not start

EZ-Start motor will not turn

EZ-Start turns but engine does not

Engine starts and then stalls

Engine sluggish, poor performance

Engine Overheats

Engine chokes/hesitates at speed

Engine stalls under hard acceleration

Engine stalls around turns

Engine stalls during normal driving

1 3 7

8 10 17

11 12 41

1 2 30

28 8 16 13 14 21 29 19 39 40 36

16 21 27

3 6 16 15 21

3 4 5 6

29 28 30 36

21

22 20 34 33 38 35 36

23 28 29 37 38 35

1 2 16 21 23 28 29 30 20 31

1 2 16 21 27 28 29

1 2 3 16 28 29 30 21 20 36

1 Out of fuel ........................................................ Fill fuel tank

2 Fuel level is low ................................................ Refill fuel tank

3 Improper or contaminated fuel ........................ Replace fuel

4 Excessive nitro in the fuel ................................ Use fuel with a lower nitro content (page 2)

5 Incorrect oil content in the fuel ........................ Switch to a recommended brand of fuel (page 2)

6 Poor Quality fuel .............................................. Switch to a recommended brand of fuel (page 2)

7 Engine not primed ............................................ Prime engine (page 6)

8 EZ-Start battery not charged ............................ Use a freshly-charged battery (page 3)

9 EZ-Start ground wire (yellow) faulty ................ Clean, tighten, or replace ground wire (page 12)

10 EZ-Start Motor wire loose ................................ Check motor connections on the EZ-Start motor

11 One-way starter bearing slipping...................... Remove EZ-Start/ Clean or replace bearing (page 12)

12 EZ-Start gears damaged .................................. Listen for excessive gear noise/ Replace gears/motor.

13 Glow plug wire loose from glow plug................ Crimp the connector on the glow plug wire

14 Glow plug wire damaged .................................. Replace or repair glow plug wire

15 Leaking glow plug gasket ................................ Check glow plug gasket/ tighten glow plug

16 Glow plug fouled or weak ................................ Check for a solid red light when the EZ-start button is pressed/ No light indicates a completely shorted plug/

Replace with Traxxas 3230 or 3231 glow plugs (page 10)

17 Engine flooded.................................................. Clear the engine of excess fuel (page 10)

18 Engine overheated............................................ Allow engine to cool- find cause for overheating

19 Exhaust blocked .............................................. Clear any obstructions

20 Air cleaner plugged .......................................... Clean and replace air cleaner element (page 5)

21 Carburetor incorrectly adjusted ........................ Readjust carburetor to factory break-in settings (page 5)

22 High-speed fuel mixture is too rich .................. Lean the high-speed mixture (page 7)

23 High-speed fuel mixture is too lean .................. Richen the high-speed mixture (page 7)

27 Idle speed set too low ...................................... Increase idle speed (page 7)

28 Fuel flow blocked .............................................. Check that all fuel lines are clear with no pin-hole leaks

Check for dirt blockage in the carburetor fuel inlet and high-speed needle seat/ Install inline fuel filter (page 10)

29 Air bubble in the fuel line .................................. Prime the engine to force the air through/ Check for pinhole leaks in the fuel line

30 Insufficient fuel tank pressure .......................... Replace the pressure hose (between pipe and fuel tank)/ clear blockage in the tuned pipe hose fitting/ check flow to and from tank/ Check fuel tank cap seal

31 Engine overheated............................................ Allow engine to cool/ find cause for overheating

33 Engine overgeared for application .................... Use a lower gear ratio (page 8)

34 Engine clutch slipping ...................................... Replace clutch shoes (see engine repair section, page 13)

35 Drive system is bound ...................................... Locate the bound item and repair

36 Engine excessively worn .................................. Repair or replace engine (page 12)

37 Cooling air to the head is blocked .................... Cut ventilation holes in the body (windshield)

38 Excessive load on the engine .......................... Check for bound drivetrain

39 Broken clutch shoe spring ................................ Replace clutch shoe spring (page 13)

40 Loose flywheel .................................................. Replace flywheel nut (page 13)

41 EZ-Start motor pinion stripped ........................ Replace EZ-Start motor

Contact Traxxas for assistance: 1-888-TRAXXAS. 972-613-3300 (outside USA). E-Mail us at [email protected]

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12

13

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