Arctic Cat 2009 366 Service Manual page 30

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
Problem: Engine noisy (Noise seems to come from transmission)
Condition
1. Gears worn - rubbing
2. Splines worn
3. Primary gears worn - rubbing
4. Bearings worn
5. Bushing worn
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 excessive
3. Tooth contact improper
4. Bearing damaged
5. Gears worn - rubbing
6. Splines worn
7. Final driven shaft thrust clearance too large
Problem: Engine idles poorly
Condition
1. Valve clearance out of adjustment
2. Valve seating poor
3. Valve guides defective
4. Rocker arms - arm shaft worn
5. Magneto defective
6. CDI unit defective
7. Spark plug fouled - gap too wide
8. Ignition coil defective
9. Float out of adjustment
10. Jets obstructed
11. Pilot screw setting improper
12. 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 out of adjustment
4. Cams - rocker arms - tappets worn
5. Spark plug gap too narrow
6. Ignition coil defective
7. Float level too low
8. Air cleaner element obstructed
9. Fuel hose obstructed
10. Fuel pump defective
Problem: Exhaust smoke dirty or heavy
Condition
1. Oil (in the engine) overfilled - contaminated
2. Piston rings - cylinder worn
3. Valve guides worn
4. Cylinder wall scored - scuffed
5. Valve stems worn
6. Stem seals defective
Back
3-4
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Remedy
1. Replace bearing
2. Replace crankshaft
3. Replace crankshaft
Remedy
1. Replace gears
2. Replace shaft(s)
3. Replace gears
4. Replace bearings
5. Replace bushing
Remedy
1. Replace gears
2. Adjust backlash
3. Adjust contact
4. Replace bearing
5. Replace gears
6. Replace shaft(s)
7. Replace thrust washer(s)
Remedy
1. Adjust clearance
2. Replace - service seats - valves
3. Replace cylinder head
4. Replace arms - shafts
5. Replace magneto
6. Replace CDI unit
7. Adjust gap - replace plug
8. Replace ignition coil
9. Adjust float height
10. Clean jets
11. Adjust pilot screw
12. Replace fuel injector
Remedy
1. Shift into higher gear - decrease speed
2. Replace springs
3. Adjust timing
4. Replace cams - arms - tappets
5. Adjust gap
6. Replace ignition oil
7. Adjust float height
8. Clean element
9. Clean or replace hose
10. Replace fuel pump
Remedy
1. Drain excess oil - replace oil
2. Replace - service rings - cylinder
3. Replace cylinder head
4. Replace - service cylinder
5. Replace valves
6. Replace seals
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