Traxxas 4902, Owner'S Manual, Page: 23 / 48

T-MAXX 2.5R
• 23
Filling the Fuel Tank
Use a fuel dispensing bottle (Traxxas Top Fueler, part#
5001) to put fuel into the T-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.
The Air Filter
The TRX 2.5R Racing Engine air filter is specifically designed to deliver
maximum performance while protecting your engine from dust and dirt.
Use only the supplied filter.
You will not improve engine performance by
switching to an aftermarket filter , and you may risk engine damage due to
poor filtration.
The TRX 2.5R Racing Engine air filter assembly consists of 3 pieces:
1. A rubber filter base.
2. A plastic housing consisting of a permanently
assembled mesh cap and body.
3. An oiled foam element.
You must clean the filter after every hour of run time, even if the filter
looks clean.
This includes the break-in time. Clean your air filter after
break-in. Dust (which is often too fine to see) and dirt constantly move
through the filter anytime the engine is running. Even if you can’t see dirt
on the filter, it is present inside the foam after any amount of run time. If
you exceed the recommended cleaning intervals, your engine will be
damaged. Engine damage or wear due to dirt ingestion is easy
to detect, and one of the top causes of premature engine failure.
Air Filter Cleaning Instructions
1. Remove the air filter from the
carburetor bore by pulling the entire
filter assembly firmly to the side to
release it.
Do not pull straight up.
2. Disassemble the filter. Pull the
rubber air filter neck out of the filter
body. With the base removed, the
foam element is visible in the
bottom of the filter body. Pull out
the foam element.
3. Clean the filter parts by thoroughly washing all three pieces of the filter
assembly in hot soapy water (dishwashing detergent works well).
Repeat twice.
4. Thoroughly dry the parts with a clean towel or compressed air.
Remember to wear your safety glasses when working with
compressed air.
5. Oil the foam element with foam filter oil. Use the supplied Traxxas filter
oil (part# 5263) or a high-quality, special-purpose foam filter oil like
what is used for off-road motorcycle and ATV engines.This type of filter
oil is available at motorcycle pro-shops. Apply 30 drops of the Traxxas
filter oil evenly to the top, bottom and sides of the filter element (30
total drops divided among the 3 surfaces). Squeeze the filter element
repeatedly to help spread the oil throughout. The filter element should
be evenly colored by the oil. Even color indicates that the oil is
distributed evenly.
Do not squeeze out excess oil.
Note: Do not use the air filter oil for anything other than the air filter.
It is not meant to be a lubricant.
6. Reassemble the filter and install it on the engine, making sure
the rubber filter neck fits securely on the carburetor with no gaps
or air leaks.
The TRX 2.5R Racing Engine