Traxxas 4902, Owner'S Manual

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T-MAXX 2.5R

Introduction

There’s nothing like the TRX 2.5R Racing Engine in your new T-Maxx 2.5R. 
The TRX 2.5R Racing Engine is a specialty high-performance racing
engine. Its impressive performance is the result of years of focused
engineering development, and thousands of hours of controlled testing
and rigorous real-world running. It offers unprecedented power and
performance that turns ready-to-run into Ready-To-Race

®

.

The TRX 2.5R Racing Engine takes a total-system approach. Each part of
the engine, from the air filter to the exhaust tip, is carefully engineered
to work in harmony with other engine components. Each part
complements the next, to extract maximum power. The TRX 2.5R Racing
Engine is designed to be tolerant of variations in tuning, and to run
successfully through a wide range of variable atmospheric conditions
such as changes in temperature, humidity, and altitude.

In order to get the longest engine life and keep the TRX 2.5R Racing
Engine in top running condition, it is very important to perform regular
routine maintenance. 

The number one cause of premature engine

wear and failure is lack of care and maintenance!

Break In

The TRX 2.5R Racing Engine is manufactured to exacting tolerances and
requires a specially-designed break-in procedure to accomplish the final
precision fitting of the internal engine components. It is very important
that you follow the new break-in procedure as closely as possible to
achieve the best performance and longest life from your TRX 2.5R Racing
Engine. Engine break-in will take between one and two hours. Old style
break-in procedures, such as idling the engine on the bench for several
tanks of fuel or simply running the engine with a very rich fuel mixture
for the first 4 tanks of fuel, will not achieve the best results. Follow the
easy steps in this manual.

Air Filter Maintenance

A clean air filter is critical for long engine life. Due to the high-
performance nature of the TRX 2.5R Racing Engine, a tremendous
amount of vacuum is created to move a large volume of high-velocity air
through the carburetor. Dirt is the worst enemy to your engine. Clean
the air filter after each hour of running to prevent sucking dirt into the
engine. Extra pre-lubed filter elements have been provided to encourage
you to maintain your air filter.

After-Run Maintenance 

Perform after-run maintenance on the engine to prevent corrosion 
from building up on the internal engine components. The fuel 
naturally attracts moisture and corrosion can build up very quickly 
inside the engine if it is not prevented.

A few minutes spent before and after each time you run your model 
will allow you to enjoy it for a long time to come. Read on for more
exciting details about your new engine.

The TRX 2.5R Racing Engine

Traxxas strongly
discourages changing or
modifying any part of the
TRX 2.5R Racing Engine.
Old tech tips and tricks that
may have boosted the
power of other engines
could seriously diminish
the performance of the 
TRX 2.5R Racing Engine.

There’s more advanced
thinking, development and
testing in the stock parts of
your TRX 2.5R Racing
Engine than in many
aftermarket manufacturer’s
performance parts. The
TRX 2.5R Racing Engine is
already the most powerful
engine in its class and
simply will not benefit
from average, low-tech,
aftermarket bolt on
performance items.