Zenoah EBZ7500, Руководство по ремонту

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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.