Troubleshooting; Engine Will Not Start Or Is Hard To Start; Engine Noisy - Arctic Cat 450 XC 2011 Service Manual

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 timing incorrect
4. Piston rings worn excessively
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. Crankshaft position sensor defective
4. 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 throttle body
Condition
1. Fuel hose obstructed
2. Fuel screens obstructed
3. Fuel pump/relay defective
4. Fuel injector defective
Problem: Engine stalls easily
Condition
1. Spark plug fouled
2. Crank angle sensor defective
3. ECU defective
4. 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
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
Problem: Engine noisy (Noise seems to come from crankshaft)
Condition
1. Bearing worn - burned
2. Lower rod-end bearing worn - burned
3. Connecting rod side clearance too large
22
Remedy
1. Adjust clearance
2. Replace cylinder head
3. Correct valve timing - check chain, sprockets, and cam chain
tensioner
4. Replace rings
5. Replace cylinder
6. Check - replace starter motor
Remedy
1. Clean - replace plug
2. Clean - dry plug
3. Replace stator assembly
4. Replace ECU
5. Replace ignition coil
6. Replace high tension lead
Remedy
1. Clean - replace hose
2. Clean - replace inlet screen - valve screen
3. Replace fuel pump/relay
4. Replace fuel injector
Remedy
1. Clean plug
2. Replace stator assembly
3. Replace ECU
4. 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
Remedy
1. Replace bearing
2. Replace crankshaft
3. Replace crankshaft
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