Arctic Cat 2009 366 Service Manual page 29

Troubleshooting
Problem: Engine will not start or is hard to start (Compression too low)
Condition
1. Valve clearance out of adjustment
2. Valve guides worn
3. Valves mistimed
4. Piston rings worn excessively
5. Cylinder bore worn
6. Spark plug seating poorly
7. Starter motor cranks too slowly - does not turn
Problem: Engine will not start or is hard to start (No spark)
Condition
1. Spark plug fouled
2. Spark plug wet
3. Magneto defective
4. CDI unit defective
5. Ignition coil defective
6. High-tension lead open - shorted
Problem: Engine will not start or is hard to start (No fuel reaching the carburetor/fuel injector)
Condition
1. Gas tank vent hose obstructed
2. Carburetor float valve defective
3. Fuel hose obstructed
4. Fuel screens obstructed
5. Fuel pump defective
Problem: Engine stalls easily
Condition
1. Spark plug fouled
2. Magneto defective
3. CDI unit defective
4. Carburetor jets obstructed
5. Valve clearance out of adjustment
Problem: Engine noisy (Excessive valve chatter)
Condition
1. Valve clearance too large
2. Valve spring(s) weak - broken
3. Rocker arm - rocker arm shaft worn
4. Camshaft worn
5. Valve tappets worn
Problem: Engine noisy (Noise seems to come from piston)
Condition
1. Piston - cylinder worn
2. Combustion chamber carbon buildup
3. Piston pin bore worn
4. Piston pin worn
5. Piston rings - ring groove(s) worn
Problem: Engine noisy (Noise seems to come from timing chain)
Condition
1. Chain stretched
2. Sprockets worn
3. Tension adjuster malfunctioning
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Remedy
1. Adjust clearance
2. Replace cylinder head
3. Adjust valve timing
4. Replace rings
5. Replace - rebore cylinder
6. Tighten plug
7. Check - replace starter motor
Remedy
1. Clean - replace plug
2. Clean - dry plug
3. Replace magneto
4. Replace CDI unit
5. Replace ignition coil
6. Replace high tension lead
Remedy
1. Clean vent hose
2. Replace valve
3. Clean - replace hose
4. Clean - replace inlet screen - valve screen
5. Replace fuel pump
Remedy
1. Clean plug
2. Replace magneto
3. Replace CDI unit
4. Clean jets
5. Adjust clearance
Remedy
1. Adjust clearance
2. Replace spring(s)
3. Replace arm - shaft
4. Replace camshaft
5. Replace tappets
Remedy
1. Replace - service piston - cylinder
2. Clean chamber
3. Replace piston
4. Replace piston pin
5. Replace rings - piston
Remedy
1. Replace chain
2. Replace sprockets
3. Repair - replace adjuster
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