Arctic Cat 2009 Prowler XT Service Manual page 73

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 - seated poorly
3. Valves mistimed
4. Piston rings worn - broken
5. Cylinder bore worn
6. 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/ECU 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 (650 cc)
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/ECU defective
4. Carburetor jets/fuel injector obstructed
5. Valve clearance out of adjustment
Problem: Engine noisy (Excessive valve chatter)
Condition
1. Valve clearance excessive
2. Valve spring(s) weak - broken
3. Rocker arm - rocker arm shaft worn
4. Camshaft worn
Problem: Engine noisy (Noise seems to come from piston)
Condition
1. Piston - cylinder worn
2. Combustion chamber carbon buildup
3. Piston pin - piston pin bore worn
4. 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. Repair - replace guides
3. Replace camshaft
4. Replace rings
5. Replace - rebore cylinder
6. See Section 5
Remedy
1. Clean - replace plug
2. Clean - dry plug
3. Replace magneto
4. Replace CDI unit/ECU
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 - replace plug
2. Replace magneto
3. Replace CDI unit/ECU
4. Clean jets/replace fuel injector
5. Adjust clearance
Remedy
1. Adjust clearance
2. Replace spring(s)
3. Replace arm - shaft
4. Replace camshaft
Remedy
1. Replace - service piston - cylinder
2. Clean chamber
3. Replace - service pin - bore
4. Replace rings - piston
Remedy
1. Replace chain
2. Replace sprockets
3. Repair - replace adjuster
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