The TRX 2.5 Racing Engine
The Fuel
Use the Right Fuel
It’s imperative that you use the correct fuel in
your TRX 2.5 for maximum performance and
engine life. Traxxas Top Fuel should be used
to ensure correct engine lubrication,
performance, and ease of tuning. Traxxas Top
Fuel has been proven in thousands of engines,
so you can count on it every day for great
performance.
Top Fuel is the only fuel which is 100% certified for use in
Traxxas engines.
Traxxas Top Fuel is made with just the right balance of the
highest grade natural and synthetic lubricants to allow
excellent throttle response and the best top-end
performance, without sacrificing long-term durability.
All of the components in the fuel are carefully selected from
the best materials available and then custom blended to
match the metallurgy and temperature characteristics of
Traxxas engines.
You may use 10% or 20% nitro-content fuel. Use the same
percentage all the time; don’t switch back and forth between
10% and 20% fuel. If you break-in your engine on 20% fuel, then
always use 20% fuel.
What about Other Fuels?
Can other brands of fuel be used besides Top Fuel? There are
other fuels that can provide satisfactory performance; however
there could be long-term costs in the form of decreased engine
performance, loss of tuning ease, and shorter engine life.
Everyone has an opinion or a claim to make about fuel. The
engineering team at Traxxas spent over 2-years developing the
TRX 2.5 Racing Engine. No one knows more about the specific
fuel requirements of Traxxas engines, than Traxxas engineers. We
strongly urge you not to take chances with your engine
investment and use the Traxxas fuel made for the TRX 2.5.
Handling the Fuel
Follow all directions and warnings on the fuel can.
Keep the fuel tightly capped at all times. Some components
in the fuel can evaporate very quickly and upset the balance
of the fuel.
Do not store unused fuel in the fuel dispenser. Immediately
return fresh unused fuel back into the fuel can.
Do not mix old and new fuel. Never mix different brands of
fuel together.
Store the fuel in a cool dry location, away from any source of
heat, ignition, or combustion.
Read and follow the safety precautions on page 5
in this manual.
Filling the Fuel Tank
Use a fuel dispensing bottle (Traxxas Top
Fueler, part# 5001) to put fuel into the
S-Maxx’s fuel tank. To fill the fuel bottle,
squeeze the air out, insert the dispenser
tip into the fuel can, and release your grip
on the bottle. As the bottle
expands, fuel will be
drawn into it.
To fill your model flip up
the spring-loaded cap on
the fuel tank, insert the tip
of the fuel bottle, and
squeeze to dispense the
fuel. Fill the tank until the
fuel level reaches the base of the filler neck. Close the fuel tank
lid, making sure it closes tightly.
Fuel Tank Seal Adjustment
The rubber seal on the fuel tank is important to the function of
the engine. The fuel tank is pressurized by the exhaust system to
provide reliable fuel flow. If the tank lid does not seal properly,
an air leak will be created that can cause your engine to run
erratically and be difficult to start. If necessary, the rubber O-ring
tank seal can be adjusted for improved sealing by tightening
the screw on the underside of the tank lid.
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You may use higher
nitro percentages than
20% in certain
circumstances. Call 1-888-
TRAXXAS for more
information.
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