Arctic Cat VLX 70002017, Service Manual

Page: 33 / 138

32
Troubleshooting
Problem: Engine will not start or is hard to start (Compression too low)
Condition Remedy
1. Gasoline bad
2. Valve clearance out of adjustment
3. Valve guides worn
4. Valve timing incorrect
5. Piston rings worn excessively
6. Cylinder bore worn
7. Starter motor cranks too slowly - does not turn
1. Drain gas - replace with clean gas
2. Adjust clearance
3. Repair - replace guides
4. Replace cam chain/sprocket and re-time engine
5. Replace rings
6. Replace cylinder
7. See Electrical System - Troubleshooting
Problem: Engine will not start or is hard to start (No spark)
Condition Remedy
1. Gasoline bad
2. Spark plug fouled
3. Spark plug wet
4. Magneto defective
5. ECM defective
6. Ignition coil defective
7. High-tension lead open - shorted
1. Drain gas - replace with clean gas
2. Clean - replace plug
3. Clean - dry plug
4. Replace stator coil
5. Replace ECM
6. Replace ignition coil
7. Replace high tension lead
Problem: Engine will not start or is hard to start (No fuel reaching the fuel injector)
Condition Remedy
1. Gasoline bad
2. Gas tank vent hose obstructed
3. Fuel hose obstructed
4. Fuel screens obstructed
5. Fuel pump defective
1. Drain gas - replace with clean gas
2. Clean vent hose
3. Clean - replace hose
4. Clean - replace inlet screen - valve screen
5. Replace fuel pump
Problem: Engine stalls easily
Condition Remedy
1. Spark plug fouled
2. Magneto defective
3. ECM defective
4. Fuel injector obstructed
5. Valve clearance out of adjustment
1. Clean plug
2. Replace magneto
3. Replace ECM
4. Replace fuel injector
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
5. Valve tappets worn
1. Adjust clearance
2. Replace spring(s)
3. Replace arm - shaft
4. Replace camshaft
5. Replace tappets
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 cylinder head and piston
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. Main bearing worn - burned
2. Lower rod-end bearing worn - burned
3. Connecting rod side clearance too large
1. Replace bearing
2. Replace crankshaft assembly
3. Replace crankshaft assembly
Problem: Engine noisy (Noise seems to come from transmission)
Condition Remedy
1. Gears worn
2. Splines worn
3. Primary gears worn
4. Bearings worn
5. Bushing worn
1. Replace gears
2. Replace shaft(s)
3. Replace gears
4. Replace bearings
5. Replace bushing