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S TA RT I N G & B R E A K I N G - I N
T H E E N G I N E

W H I L E O P E R AT I N G

•

DO NOT

drive the model on a public street! This can cause serious accidents, personal

injuries and/or property damage.

•

DO NOT

operate near pedestrians or small children.

•

DO NOT

operate in small or confined areas.

•

DO NOT

operate in areas where loud noises can disturb others, such as residential areas.

W A R N I N G

Before starting the engine, make sure all fasteners are tight, especially those at joints and
moving parts, such as the throttle arm. Loose fasteners are often the source of damaged
components and could lead to injury and/or property damage.

B R E A K I N G - I N

The break-in procedure is performed to prepare the engine for running conditions (fuel,
RPM, engine temperature, etc). Excessively rich and prolonged low speed running should be
avoided. Running at low speeds and low temperatures for prolonged periods of time will have
a negative effect on the performance and lifespan of your engine.

P R E S S U R I Z E D F U E L S Y S T E M

• The constant changes in vehicle attitude that occur in off-road conditions, combined

with the distance between the fuel tank and carburetor can negatively affect performance.
Because of this, it is recommended that only a muffler with a pressurized fuel feed system
be used.

• Never run your vehicle without installing the air filter. The dust and dirt that will be drawn

into the engine will cause permanent damage to the components.

NOTE:

It is incredibly important to set the throttle to the neutral

position before starting the engine. If the engine is allowed to run
with the throttle open too far under “no load” conditions (i.e. with
the driving wheels not in contact with the ground), the engine may
overheat and could be damaged.

H E AT C Y C L E B R E A K - I N M E T H O D

The purpose of this break in method is to heat cycle the engine without subjecting the
components to the stress that comes from breaking-in an engine that is overly rich and cold.
You want the engine to reach temperatures in the low 200°F (93ºC) range to reduce stress
on the components.

Pre-heat the engine to approximately 150°-160°F (66º-71°C) using an engine heater or heat
gun before starting for the first time and pre-heat the engine each time you start it during the
break-in process. Additionally, if you have trouble keeping the temperature in the 200°F range
while the engine is running, it may be beneficial to wrap the cooling head with an insulator
of some type, such as tin foil, or an old sock. This will help the engine retain heat and reach
200°F while it is tuned with the rich needle settings.

After a brief warm up period, disconnect the glow plug igniter and run the car on the track
for approximately 3 minutes at low speed. If the engine stalls, increase the amount of throttle
being applied slightly. If the engine stalls because it is excessively rich, close the needle valve
30° and try again. When the 3 minutes are up, shut the engine down, verify that the piston
is at the bottom of the stroke (Bottom Dead Center - BDC) and let it cool completely. Once
the engine has cooled down, close the needle valve 30°, start it again and run the car for
another 3 minutes, let it cool off with the piston at BDC. Repeat 3 more times for a total of 15
minutes (five 3 minute cycles), keeping an eye on the temperature and making sure it is in the
low 200° range. Now increase the run time to 4 minute intervals and close the needle valve
as needed to prevent the engine from running overly rich. Vary the RPM, gradually increasing
speed, and make sure that the temperature is in the low 200° F range. Run at 4 minute
intervals, five cycles, for a total of 20 minutes. After this the engine is ready for race tuning.

NOTE:

During the first few cycles, it is important that you use smooth throttle inputs

and do not “spike” the throttle to protect the bearings.

Piston

Cylinder Liner

Crankshaft

Near TDC

Slight taper

When the engine is cold.

When the engine is hot.

Low Speed Needle
(Metering Needle)

Idle Screw
(Throttle Stop Screw)