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10. Troubleshooting
10-1 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 occur in the spark gap or not.
Trouble
Probable Cause
Countermeasure
No spark in the spark plug.
Spark plug
1. Wet spark plug electrodes
Make them dry.
2. Carbon deposited on the electrodes
Clean or replace.
3. Smolder of the electrodes
Clean or replace.
4. Insulation failure by insulator damage
Replace.
5. Improper spark gap
Adjust to 0.6 to 0.7mm or replace.
6. Burn-out of the electrodes
Replace.
Ignition coil
1. Ignition coil inside failure
Replace.
2. Air gap is not proper
Adjust to 0.3mm.
3. Plug cap and cap spring are damaged
Replace.
4. Damage cord sheath or disconnection
Repair or replace.
Switch
1. Switch is OFF
ON the switch.
2. Switch failure
Replace.
3. Primary wiring ground
Repair or replace.
Sparks appear in the spark plug.
Compression and
fueling are normal
1. Over sucking of fuel
Drain excess fuel.
2. Too rich fuel
Adjust or replace carburetor.
3. Overflow
Adjust or replace carburetor.
4. Clogging of the pre-filter and
the paper filter
Pre-filter
Wash with hot water containing
neutral detergent and dry.
Paper filter
Clean with air blow or replace.
5. Incorrect fuel
Change with proper fuel.
Fueling normal but
poor compression
1. Spark plug is loosened
Retighten.
2. Cylinder wall and piston ring are worn or damaged Replace.
3. Gas leakage from cylinder and crankcase
Replace gasket and reassemble.
No fuel supply
1. Carburetor improper adjustment
Readjust.
2. Clogged carburetor
Disassemble and clean.
3. Clogged fuel filter
Clean or replace.
4. Clogged or damaged fuel pipes
Clean or replace.
5. Gas leakage from oil seal of the crankcase
Replace.
