Arctic Cat VLX 70002017 Service Manual page 34

Problem: Engine noisy (Noise seems to come from secondary bevel gear and final driven shaft)
Condition
1. Drive - driven bevel gears damaged - worn
2. Backlash incorrect
3. Tooth contact improper
4. Bearing damaged
5. Gears worn
6. Splines worn
Problem: Engine idles poorly
Condition
1. Gasoline bad
2. Valve clearance incorrect
3. Valve seating poor
4. Valve guides defective
5. Rocker arms - arm shaft worn
6. Magneto defective
7. ECM defective
8. Spark plug fouled - gap incorrect
9. Ignition coil defective
10. Fuel injector obstructed
Problem: Engine runs poorly at high speed
Condition
1. High RPM "cut out" against RPM limiter
2. Valve springs weak
3. Valve timing incorrect
4. Cams - rocker arms - tappets worn
5. Spark plug gap incorrect
6. Ignition coil defective
7. Fuel pump defective
8. Air cleaner element obstructed
9. Fuel hose obstructed
Problem: Exhaust smoke dirty or heavy
Condition
1. Engine oil overfilled - contaminated
2. Piston rings - cylinder worn
3. Valve guides worn
4. Cylinder wall scored
5. Valve stems worn
6. Stem seals defective
Problem: Engine lacks power
Condition
1. Valve clearance incorrect
2. Valve springs weak
3. Valve timing incorrect
4. Piston ring(s) - cylinder worn
5. Valve seating poor
6. Spark plug fouled
7. Rocker arms - shafts worn
8. Spark plug gap incorrect
9. Fuel injector obstructed
10. Cam chain worn
11. Air cleaner element obstructed
12. Engine oil overfilled - contaminated
13. Intake manifold leaking air
Problem: Engine overheats
Condition
1. Carbon deposit (piston crown) excessive
2. Oil low
3. Octane low - gasoline poor
4. Oil pump defective
5. Oil circuit obstructed
6. Intake manifold leaking air
7. Fan malfunctioning
8. Fan relay malfunctioning
9. Radiator hoses - cap damaged - obstructed
10. Coolant level low
11. Thermostat stuck - closed
Remedy
1. Replace gears
2. Adjust backlash
3. Adjust contact
4. Replace bearing
5. Replace gears
6. Replace shaft(s)
Remedy
1. Drain gas - replace with clean gas
2. Adjust clearance
3. Replace - service seats - valves
4. Replace guides
5. Replace arms - shafts
6. Replace stator coil
7. Replace ECM
8. Adjust gap - replace plug
9. Replace ignition coil
10. Replace fuel injector
Remedy
1. Shift into higher gear - decrease speed
2. Replace springs
3. Time valves
4. Replace cams - arms - tappets
5. Adjust gap
6. Replace ignition oil
7. Replace fuel pump
8. Clean element
9. Clean or replace hose
Remedy
1. Drain excess oil - replace oil
2. Replace - service rings - cylinder
3. Replace guides
4. Replace - service cylinder
5. Replace valves
6. Replace seals
Remedy
1. Adjust clearance
2. Replace springs
3. Re-time valve gear
4. Replace - service rings - cylinder
5. Repair seats
6. Clean - replace plug
7. Replace arms - shafts
8. Adjust gap - replace plug
9. Replace injector
10. Replace cam chain
11. Clean element
12. Drain excess oil - change oil
13. Tighten - replace manifold
Remedy
1. Clean piston
2. Add oil
3. Drain - replace gasoline
4. Replace pump
5. Clean circuit
6. Tighten - replace manifold
7. Replace fan relay
8. Check fan fuse - replace fan
9. Clear obstruction - replace hoses
10. Fill - examine system for leaks
11. Replace thermostat
33