3-5
3
Problem: Engine noisy (Noise seems to come from timing chain)
Condition Remedy
1. Chain stretched
2. Sprockets worn
3. Tension adjuster malfunctioning
1. Replace chain
2. Replace sprockets
3. Repair - replace adjuster
Problem: Engine noisy (Noise seems to come from crankshaft)
Condition Remedy
1. Bearing worn - burned
2. Lower rod-end bearing worn - burned
3. Connecting rod side clearance too large
1. Replace bearing
2. Replace crankshaft
3. Replace crankshaft
Problem: Engine noisy (Noise seems to come from transmission)
Condition Remedy
1. Gears worn - rubbing
2. Splines worn
3. Primary gears worn - rubbing
4. Bearings worn
5. Bushing worn
1. Replace gears
2. Replace shaft(s)
3. Replace gears
4. Replace bearings
5. Replace bushing
Problem: Engine noisy (Noise seems to come from secondary bevel gear and final driven shaft)
Condition Remedy
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
1. Replace gears
2. Adjust backlash
3. Adjust contact
4. Replace bearing
5. Replace gears
6. Replace shaft(s)
7. Replace thrust washer(s)
Problem: Engine idles poorly
Condition Remedy
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
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
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