Arctic Cat 2016 90 Utility Service Manual page 54

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
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
53