Arctic Cat 300 Utility Service Manual page 74

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-transmission/right-side cover)
Condition
1. Gears - shaft(s) worn
2. Bearing(s)/bushing(s) damaged
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: Centrifugal clutch slipping
Condition
1. Clutch shoes worn
2. Clutch housing excessively worn
3. Drive belt slipping - worn
Problem: Secondary-transmission will not shift or shift back
Condition
1. Sliding dog broken - worn
2. Gearshift fork broken - worn
3. Hi/Low shift lever out of adjustment
4. Gearshift cam worn
5. Cam stopper spring weak
6. Gearshift fork shaft worn
7. Engine idle too high
8. Shift linkage out of adjustment
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
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 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
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
7. Air cleaner element obstructed
8. Float level too high
Remedy
1. Replace gears
2. Replace shaft(s)
3. Replace gears
4. Replace bearings
5. Replace bushing
Remedy
1. Replace gears - shafts
2. Replace bearing(s)/bushing(s)
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. Replace shoes
2. Replace clutch housing
3. Replace drive belt
Remedy
1. Replace dog
2. Replace fork
3. Adjust lever
4. Replace cam
5. Replace spring
6. Replace shaft
7. Adjust engine idle
8. Adjust shift linkage
Remedy
1. Adjust clearance
2. Replace - service seats - valves
3. Replace guides
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
Remedy
1. Shift into higher gear - decrease speed
2. Replace springs
3. Adjust timing
4. Replace cams - arms
5. Adjust gap
6. Replace ignition oil
7. Adjust float height
8. Clean element
9. Clean - prime hose
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
7. Clean element
8. Adjust float level
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