Arctic Cat 300 Utility Service Manual page 75

Problem: Engine lacks power
Condition
1. Valve clearance incorrect
2. Valve springs weak
3. Valve timing out of adjustment
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. Carburetor jets obstructed
10. Float level out of adjustment
11. Air cleaner element obstructed
12. Oil (in the engine) overfilled - contaminated
13. Intake manifold leaking air
14. Cam chain worn
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. Gasoline level (in float chamber) too low
7. Intake manifold leaking air
8. Coolant level low
9. Fan malfunctioning
10. Fan switch malfunctioning
11. Thermostat stuck - closed
12. Radiator hoses - cap damaged - obstructed
72
Remedy
1. Adjust clearance
2. Replace springs
3. Adjust timing
4. Replace - service rings - cylinder
5. Repair seats
6. Clean - replace plug
7. Replace arms - shafts
8. Adjust gap - replace plug
9. Clean jets
10. Adjust float height
11. Clean element
12. Drain excess oil - change oil
13. Tighten - replace manifold
14. Replace cam chain
Remedy
1. Clean piston
2. Add oil
3. Drain - replace gasoline
4. Replace pump
5. Clean circuit
6. Adjust float height
7. Tighten - replace manifold
8. Fill - examine system for leaks
9. Check fan fuse - replace fan
10. Replace fan switch
11. Replace thermostat
12. Clear obstruction - replace hoses