Arctic Cat Altera 300, Service Manual

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28
Troubleshooting
Problem: Engine will not start or is hard to start (Compression too low)
Condition Remedy
1. Valve clearance out of adjustment
2. Valve guides worn - seated poorly
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
1. Adjust clearance
2. Repair - replace guides
3. Adjust valve timing
4. Replace rings
5. Replace cylinder
6. Tighten plug
7. See Electrical System
Problem: Engine will not start or is hard to start (No spark)
Condition Remedy
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
1. Clean - replace plug
2. Clean - dry plug
3. Replace magneto
4. Replace CDI unit
5. Replace ignition coil
6. Replace high tension lead
Problem: Engine will not start or is hard to start (No fuel reaching the carburetor)
Condition Remedy
1. Gas tank cap obstructed
2. Carburetor inlet needle defective
3. Fuel hose obstructed
4. Fuel screens obstructed
1. Clean or replace cap
2. Replace needle
3. Clean - replace hose
4. Clean - replace inlet screen - valve screen
Problem: Engine stalls easily
Condition Remedy
1. Spark plug fouled
2. Magneto defective
3. CDI unit defective
4. Carburetor jets obstructed
5. Valve clearance out of adjustment
1. Clean plug
2. Replace magneto
3. Replace CDI unit
4. Clean jets
5. Adjust clearance
Problem: Engine noisy (Excessive valve chatter)
Condition Remedy
1. Valve clearance too large
2. Valve spring(s) weak - broken
3. Rocker arm - rocker arm shaft worn
4. Camshaft worn
1. Adjust clearance
2. Replace spring(s)
3. Replace arm - shaft
4. Replace camshaft
Problem: Engine noisy (Noise seems to come from piston)
Condition Remedy
1. Piston - cylinder worn
2. Combustion chamber carbon buildup
3. Piston pin - piston pin bore worn
4. Piston rings - ring groove(s) worn
1. Replace - service piston - cylinder
2. Clean chamber
3. Replace - service pin - bore
4. Replace rings - piston
Problem: Engine noisy (Noise seems to come from timing chain)
Condition Remedy
1. Chain stretched
2. Sprockets worn
3. Tension adjuster malfunctioning
1. Replace chain
2. Replace sprockets
3. Repair - replace adjuster
Problem: Engine noisy (Noise seems to come from crankshaft)
Condition Remedy
1. Bearing worn - burned
2. Lower rod-end bearing worn - burned
3. Connecting rod side clearance too large
1. Replace bearing
2. Replace bearing
3. Replace thrust washer(s)
Problem: Engine noisy (Noise seems to come from transmission)
Condition Remedy
1. Gears worn - rubbing
2. Splines worn
3. Primary gears worn - rubbing
4. Bearings worn
5. Bushing worn
1. Replace gears
2. Replace shaft(s)
3. Replace gears
4. Replace bearings
5. Replace bushing
Problem: Engine noisy (Noise seems to come from secondary-transmission/right-side cover)
Condition Remedy
1. Gears - shaft(s) worn
2. Bearing(s)/bushing(s) damaged
1. Replace gears - shafts
2. Replace bearing(s)/bushing(s)