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9. Trouble Shooting
1) ENGINE DOES NOT START
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
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
fueling is normal
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
poor compression
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
11
2) LACK OF POWER OR UNSTABLE RUNNING
Description
Cause
Countermeasure
Compression is normal
1. Air penetration from fuel pipe joints, etc
Secure connection
and no misfire
2. Air penetration from intake tube joint or
Change gasket or tightening screws
carburetor joint
3. Water in fuel
Change with good fuel
4. Piston start to seizure
Replace piston(and cylinder)
5. Muffler choked with carbon
Cleaning
Overheating
1. Fuel too lean
Adjust carburetor
2. Clogging of cylinder fin with dust
Cleaning
3. Poor fuel quality
Exchange with proper fuel
4. Carbon deposited in the combustion chamber
Cleaning
5. Spark plug electrode red hot
Thoroughly clean, adjust spark gap
[ 0.6~0.7(0.023~0.028in) ]
Others
1. Dirty air cleaner
Wash with mixed gasoline
2. Over loading
Reduce load
Summary of Contents for Komatsu G260RC
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