GENERAL INFORMATION
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4. Incorrect valve timing and worn or damaged valve springs can cause poor high-speed
performance. If the camshaft was timed just before the UTV experiencing this type of problem.
The cam timing may be incorrect. If the cam timing was not set or changed. And all the other
inspection procedures in this section failed to locate the problem. Inspect the camshaft and valves
assembly
FUEL SYSTEM
The following section isolates common fuel system problems under specific complaints. If there is a
good spark. Poor fuel flow may be preventing the correct amount of fuel from being supplied to the
spark plug. Troubleshoot the fuel system as follows:
1. Clogged fuel tank breather hose
2. Check that there is a sufficient amount of fuel in the rank
3. Start the engine after the following examination. Remove the spark plug, see if there is fuel on the
end of it.
Note the following:
a. If there is no visible fuel on the end of the spark plug, go to check whether the fuel valve, oil
injector or fuel hose is clogged.
b. If the spark plug at the bottom of a fuel. And the engine has spark. Check for an excessive
intake air leak or the possibility of contaminated or stale fuel
NOTE
If the UTV was not used for some time. And was not
properly stored. The fuel may have gone stale.
Where lighter parts of the fuel have evaporated.
Depending on the condition of the fuel. a no-start
condition can result
c. If there is too much fuel on the end of the spark plug, go to check whether there is overflow at
the air filter or the ducting damper.
Rich Mixture
The following conditions can cause a rich air/fuel mixture:
1. Air pressure sensor, oxygen sensor, solar term door position sensor fault
2. ECU program error or damage
Lean Mixture
The following conditions can cause a lean air/fuel mixture:
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