| 1) Spark weak: |
Spark plug dirty, broken, or maladjusted
Spark plug cap or H.T. Cable trouble.
Spark plug cap short or not in good contact.
Spark plug incorrect
CDI unit trouble
Pickup coil trouble
Ignition coil trouble
Magneto flywheel trouble
|
| 2) Fuel/air mixture
incorrect: |
Air screw and /or idle adjusting screw maladjusted
Pilot jet, or air passage clogged
Choke valve stuck open
Air cleaner clogged, poorly seated, or missing
Fuel level too high or too low
Fuel tank air vent obstructed
Carburetor holder loose
Air cleaner duct loose
|
| 3) Compression low |
Refer A – 3
|
| 4) Other |
Throttle valve doesn’t side smoothly
Engine oil viscosity too high
Brakes dragging
Poor running or no power at high speed
|
