Huansong UTV 700 2009, Service Manual

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GENERAL INFORMATION
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2. Test ride the UTV and accelerate quickly from first to second gear. If the engine speed in-creased
according to throttle position. Perform Step 3 . If the engine speed did not increase. Check CVT
a. Warped clutch plates/discs
b. CVT spring
3. Test ride the UTV and accelerate lightly. If the engine speed increased according to throttle position.
Perform Step 4. If the engine speed did not increase. Check for one or more of the following
problems:
a. Clogged air filter
b. Restricted fuel flow
c. Pinched fuel tank breather hose (Figure 9).
d. Clogged or damaged silencer or muffler
NOTE
A clogged exhaust system will prevent some of the
burned exhaust gasses from exiting the exhaust port at
the end of the exhaust stroke. This condition effects the
incoming air/fuel mixture on the intake stroke and
reduces engine power
4. Check for retarded ignition timing. A decrease in power results when the plugs fire later than normal
5. Check for one or more of the following problems
a. Low engine compression
b. Worn spark plug
c. Fouled spark plug
d. Incorrect spark plug heat range
e. Weak ignition coil
f. Incorrect ignition timing
g. Plugged carburetor passages
h. Incorrect oil level (too high or too low)
i. Contaminated oil
j. Worn or damaged valve train assembly
k. Engine overheating
6. If the engine knocks when it is accelerated or when running at high speed. Check for one or more of
the following possible malfunctions:
a. Incorrect type of fuel
b. Lean fuel mixture
c. Advanced ignition timing
NOTE
Other signs of advanced ignition timing are engine
overheating and hard or uneven engine starting
d. Excessive carbon buildup in combustion chamber
e. Worn pistons and/or cylinder bores