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GENERAL INFORMATION
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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
Poor Idle or Low Speed Performance
1. Check for an incorrect pilot screw adjustment
2. Check for damaged or loose intake pipe and air filter housing hose clamps. These
conditions will cause an air leak
3. Perform the spark test in this chapter. Note the following:
a. If the spark is good. Go to Step 4
b. If the spark is weak. Perform the Peak Voltage Testing
4. Check the ignition timing. If ignition timing is correct. Perform Step 5. If the timing is
incorrect. Perform the Peak Voltage Testing
5. Check the fuel system as described in this chapter
Poor High Speed Performance
1. Check ignition timing. If the ignition timing is correct. Perform Step 2. If the timing is incorrect.
Perform the Peak Voltage
2. Check the fuel system as described in this chapter
3. Check the valve clearance as described. Note the following:
a. If the valve clearance as correct. Perform Step 4
b. If the clearance is incorrect. adjust the valves clearance as described in Chapter Three
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
