Arctic Cat 2012 DVX 90 Service Manual page 45

FOR ARCTIC CAT ATV DISCOUNT PARTS CALL 606-678-9623 OR 606-561-4983
Problem: Engine noisy (Noise seems to come from clutch)
Condition
1. Clutch shoe(s) worn
2. Driven clutch hub warped - worn
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
4. Engine oil low - incorrect grade
Problem: Engine idles poorly
Condition
1. Magneto defective
2. CDI unit defective
3. Spark plug fouled - gap too wide
4. Ignition coil defective
5. Float level out of adjustment
6. Carburetor jets obstructed
7. Pilot screw setting improper
Problem: Engine runs poorly at high speed
Condition
1. Spark plug gap too narrow
2. Ignition coil defective
3. Float level too low
4. Air cleaner element obstructed
5. Fuel hose obstructed
6. Carburetor jets obstructed
7. Air filter inlet pipe obstructed
Problem: Exhaust smoke dirty or heavy
Condition
1. Piston rings - cylinder worn
2. Cylinder wall scored - scuffed
3. Crankcase over-full of oil
4. Air filter too much air filter element oil
5. Carburetor jets incorrect size (too big)
Problem: Engine lacks power
Condition
1. Piston ring(s) - cylinder worn
2. Spark plug fouled
3. Spark plug gap incorrect
4. Carburetor jets obstructed
5. Float level out of adjustment
6. Air filter element obstructed
7. Intake manifold leaking air
8. Brake(s) dragging
9. Drive axle bent - worn bearings
10. Drive chain - sprockets stretched - worn
Problem: Engine overheats
Condition
1. Carbon deposit (piston crown) excessive
2. Engine oil low
3. Octane low - gasoline poor
4. Oil pump defective
5. Oil filter/screen obstructed
6. Float level low
7. Intake manifold leaking air
8. Air filter element obstructed
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Remedy
1. Replace clutch shoe(s)
2. Replace clutch
Remedy
1. Replace bearing
2. Replace bearing
3. Replace thrust washer(s)
4. Fill crankcase with recommended engine oil
Remedy
1. Replace magneto
2. Replace CDI unit
3. Adjust gap - replace plug
4. Replace ignition coil
5. Adjust float height
6. Clean jets
7. Adjust pilot screw
Remedy
1. Adjust gap
2. Replace ignition oil
3. Adjust float arm height
4. Clean element
5. Clean - prime hose
6. Clean jets
7. Remove obstruction
Remedy
1. Replace - service rings - cylinder
2. Replace - service cylinder
3. Drain excess oil from crankcase - recheck oil level
4. Use recommended type and quantity air filter element oil
5. Use recommended carburetor jets
Remedy
1. Replace - service rings - cylinder
2. Clean - replace plug
3. Adjust gap - replace plug
4. Clean jets
5. Adjust float arm height
6. Clean element
7. Tighten - replace manifold
8. Adjust brake(s)
9. Straighten - replace axle
10. Replace sprocket - chain
Remedy
1. Clean piston
2. Add engine oil
3. Drain - replace gasoline
4. Replace pump
5. Clean filter/screen
6. Adjust float arm height
7. Tighten - replace manifold
8. Clean element
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