| 1) Firing incorrect: |
Spark plug dirty, broken, or maladjusted
Spark plug incorrect
|
| 2) Fuel/air mixture
incorrect: |
Main jet clogged
Fuel level too low
Carburetor holder loose
Air cleaner poorly sealed, or missing
Air cleaner duct loose
Air cleaner clogged
|
| 3) Compression high: |
Carbon built up in combustion chamber
|
| 4) Engine load faulty: |
Clutch slipping
Engine oil level too high
Engine oil viscosity too high
Brakes dragging
|
| 5) Lubrication inadequate: |
Engine oil level too low
Engine oil poor quality or incorrect
|
| 6) Incorrect ignition
timing |
| |
| 7) Pickup coil faulty |
| |
| 8) CDI Unit faulty |
| |
