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8. Troubleshooting
8-1 Engine does not start
Remove the spark plug from the cylinder. Put the spark plug on the outside of the cylinder.
Pull the recoil starter knob, and check whether sparks arise in the spark gap or not.
Trouble Probable Cause Countermeasure
No spark in the spark plug.
1. Wet spark plug electrodes Make them dry.
2. Carbon deposited on the electrodes Clean.
3. Insulation failure by insulator damage Replace.
4. Improper spark gap
Adjust to
0.6～0.7 mm (0.023～0.028 in.).
Spark plug
5. Burn out of electrodes Replace.
1. Ignition coil inside failure Replace. Magneto
2. Damaged cable sheath Replace or repair.
1. Switch is OFF ON the switch.
2. Switch is failure Replace.
Switch
3. Primary wiring ground Repair.
Sparks appear in the spark plug.
1. Over sucking of fuel Drain excess fuel.
2. Too rich fuel Adjust carburetor.
3. Overflow Adjust or replace carburetor.
4. Clogging air cleaner Wash with mixed gasoline.
Compression and
fueling is normal
5. Incorrect fuel Change with proper fuel.
1. Worn out cylinder, piston, or piston ring Replace. Fueling normal but
poor compression
2. Gas leakage from cylinder and crank case gasket Apply liquid gasket and reassemble.
1. Choked breather air hole Clean.
2. Clogged carburetor Clean.
No fuel supply
3. Clogged fuel filter Replace fuel filter.
8-2 Engine stop during operation
Trouble Probable Cause Countermeasure
1. Switch is OFF ON the switch.
2. Plug cap disconnect Connect properly.
3. Short circuit by carbon deposited on the plug electrodes Clean.
4. Switch cord or high tension cord sheath worn out Replace.
5. Ignition coil inside failure Replace.
Suddenly stopped.
6. Engine seizure Overhaul and replace damaged parts.
1. Lack of fuel Refill.
2. Clogged carburetor Clean.
Gradual speed
reduction and
stopped.
3. Water mixed to fuel Drain and apply new fuel.
8-3 Engine cannot be stopped
Trouble Probable Cause Countermeasure
1. Lean fuel Adjust carburetor.
2. Cylinder fin clogged with dusts Clean.
3. Improper fuel Change with proper fuel.
4. Carbon deposited inside of combustion chamber Clean.
Overheating
5. Spark plug electrode red hot
Clean thoroughly and adjust spark gap
to 0.6～0.7mm (0.023～0.028in.).
1. Faulty switch Replace. Switch
2. Cord failure Repair.
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