Problem: Engine Lacks Power; Problem: Engine Overheats - Arctic Cat 450 XC 2011 Service Manual

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. Air cleaner element obstructed
10. Oil (in the engine) overfilled - contaminated
11. Intake manifold leaking air
12. 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. Intake manifold leaking air
7. Fan malfunctioning
8. Fan switch malfunctioning
9. Radiator fins obstructed
10. Coolant level low
11. Thermostat sticking
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Remedy
1. Adjust clearance
2. Replace springs
3. Re-time valve gear
4. Replace - service rings - cylinder
5. Replace cylinder head/valves
6. Clean - replace plug
7. Replace arms - shafts
8. Adjust gap - replace plug
9. Clean element
10. Drain excess oil - change oil
11. Tighten - replace manifold
12. Replace cam chain
Remedy
1. Clean piston
2. Add oil
3. Drain - replace gasoline
4. Replace pump
5. Clean circuit
6. Tighten - replace manifold
7. Check fan fuse - replace fan
8. Replace fan switch
9. Clean radiator
10. Add coolant
11. Replace thermostat
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