3-5
3
Problem: Engine lacks power
Condition
Remedy
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.
Float level
out of adjustment
11.
Air cleaner element
obstructed
12.
Oil (in the engine)
overfilled - contaminated
13.
Intake manifold
leaking air
14.
Cam chain
worn
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. Adjust float height
11. Clean element
12. Drain excess oil - change oil
13. Tighten - replace manifold
14. Replace cam chain
Problem: Engine overheats
Condition
Remedy
1.
Carbon deposit (piston crown)
excessive
2.
Oil
low
3.
Octane
low - gasoline poor
4.
Oil pump
defective
5.
Oil circuit
obstructed
6.
Gasoline level (in float chamber)
too low
7.
Intake manifold
leaking air
8.
Fan
malfunctioning
9.
Fan switch
malfunctioning
1. Clean piston
2. Add oil
3. Drain - replace gasoline
4. Replace pump
5. Clean circuit
6. Adjust float height
7. Tighten - replace manifold
8. Check fan fuse - replace fan
9. Replace fan switch
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