There can be so many problems with the engines. Different people and
different engines make varied permutation and combination of problems
that can be encountered with them. Here are some of the common problems
Some times the engine is very cool and stops short after a short run.
When the engine is very cool is starts immediately but after some turns
at medium speed it if you put brakes or try to run at very slow speed
it stops. It may be because it might not be pulling enough gas. This
might be an indication of a worn piston sleeve. This may give you a
good engine start for about a minute of 45 seconds but stops short after
a few turns. Another checking can be required at the flywheel by hand.
After it is warmed up and stalling, you should feel considerable resistance
as the piston approached TDC. One can try turning the flywheel to check
how much compression is left. If one can turn If it can be turned with
a finger and runs only for a few seconds and start only when it is cooled
then surely piston or the sleeve is to be blamed.
Another reason can be that it might not be sucking enough gas as it
has no compression. The engine has to be running and sucking in air
to suck the fuel through the carburetor. This is not in proper place
as the compression is down.
Most important aspect is to listen to your engines. Most people especially
those driving Nitro models, fall into watching the smoke that comes
from the exhaust and tuning the engines. But problems with consistent
performance may arise if there is a change in type of fuel. Different
fuel types may give into different range of engine performances. Further,
it is not suitable to expect the engines to perform race after race
and in different conditions and every problem to be solved just by taking
a look at the smoke. It is important to learn to how the engine sounds
and responds to the throttle input.
Other than those there can be many instances when the engine stalls
or simply it would not start. If the engine is cutting out fast turns
then its time to give a check on the fuel system of the engine. Other
problems that may arise due to fuel system can be that engine might
be running very badly. One needs to check out if the mixture is too
lean or too rich, head pressure, fuel lines etc and all things related
to fuel system. A thorough investigation and fixing of the same can
give out better engine performance.
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