Arctic Cat Y-12+ 2012 Service Manual page 25

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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 incorrect
3. Tooth contact improper
4. Bearing damaged
5. Gears worn
6. Splines worn
Problem: Engine idles poorly
Condition
1. Valve clearance incorrect
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 incorrect
8. Ignition coil defective
9. Float out of adjustment
10. Jets obstructed
11. Pilot screw setting improper
Problem: Engine runs poorly at high speed
Condition
1. High RPM "cut out" against RPM limiter
2. Valve springs weak
3. Valve timing incorrect
4. Cams - rocker arms - tappets worn
5. Spark plug gap incorrect
6. Ignition coil defective
7. Fuel pump defective
8. Air cleaner element obstructed
9. Fuel hose obstructed
10. Float level too low
Problem: Exhaust smoke dirty or heavy
Condition
1. Engine oil overfilled - contaminated
2. Piston rings - cylinder worn
3. Valve guides worn
4. Cylinder wall scored
5. Valve stems worn
6. Stem seals defective
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. Carburetor jets obstructed
10. Cam chain worn
11. Air cleaner element obstructed
12. Engine oil overfilled - contaminated
13. Intake manifold leaking air
14. Float level out of adjustment
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. Radiator hoses - cap damaged - obstructed
7. Intake manifold leaking air
8. Coolant level low
9. Fan malfunctioning
10. Fan relay malfunctioning
11. Thermostat stuck - closed
12. Gasoline level (in float chamber) too low
3-4
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Manual
Table of Contents
Remedy
1. Replace gears
2. Adjust backlash
3. Adjust contact
4. Replace bearing
5. Replace gears
6. Replace shaft(s)
Remedy
1. Adjust clearance
2. Replace - service seats - valves
3. Replace guides
4. Replace arms - shafts
5. Replace stator coil
6. Replace CDI unit
7. Adjust gap - replace plug
8. Replace ignition coil
9. Adjust float height
10. Clean jets
11. Adjust pilot screw
Remedy
1. Shift into higher gear - decrease speed
2. Replace springs
3. Time valves
4. Replace cams - arms - tappets
5. Adjust gap
6. Replace ignition oil
7. Replace fuel pump
8. Clean element
9. Clean or replace hose
10. Adjust float height
Remedy
1. Drain excess oil - replace oil
2. Replace - service rings - cylinder
3. Replace guides
4. Replace - service cylinder
5. Replace valves
6. Replace seals
Remedy
1. Adjust clearance
2. Replace springs
3. Re-time valve gear
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. Replace cam chain
11. Clean element
12. Drain excess oil - change oil
13. Tighten - replace manifold
14. Adjust float height
Remedy
1. Clean piston
2. Add oil
3. Drain - replace gasoline
4. Replace pump
5. Clean circuit
6. Clear obstruction - replace hoses
7. Tighten - replace manifold
8. Fill - examine system for leaks
9. Check fan fuse - replace fan
10. Replace fan relay
11. Replace thermostat
12. Adjust float height
Section
Table of Contents