8. TROUBLE SHOOTING
Description Cause Countermeasure
No spark in the spark plug
Spark Plug 1.Wet spark plug electrodes Make them dry
2.Carbon deposited on the electrodes Cleaning
3.Insulation failure by insulator damage Exchange
4.Inproper spark gap
Adjust to 0.6-0.7mm (0.023-0.028in.)
5.Burn out of electrodes Exchange
Magneto 1.Ignition coil inside failure Exchange
2.Damaged cable sheath or disconnected cable
Exchange or repair
Switch 1.Switch is OFF ON the switch
2. Switch failure Exchange
3. Primary wiring earthed Repair
Sparks appear in the spark plug
Compression & 1.Over sucking of fuel Drain excess fuel
2.Too rich fuel Adjust carburetor
3.Overflow Carburetor adjust or exchange
4. Clogging of air cleaner Wash with mixed gasoline
5.Faulty fuel Change with proper fuel
Fueling normal but
1.Worn out cylinder, piston, or piston ring
Exchange
2.
Gas leakage from cylinder and crank case gasket
Apply liquid gasket and reassemble.
No fuel supply 1. Choked breather air hole Cleaning
2.Clogged carburetor Cleaning
3.Clogged fuel filter Exchange fuel filter
fueling is normal
poor compression
Description Cause Countermeasure
Suddenly stopped 1.Switch is OFF ON the switch
2.Plug cap disconnected Properly fit as original
3.Short circuit of spark plug electrodes by carbon
Remove carbon
4. Switch cable or high tension cable Exchange
sheath worn out
5. Ignition coil inside failure Exchange
6. Engine seizure Overhaul
Gradual speed reduction 1.Lack of fuel Supply fuel
2.Clogging inside carburetor Cleaning
3.Water mixed to fuel Drain and apply new fuel
and stalled
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