GB-12
TROUBLESHOOTING GUIDE (Tabulated Overview)
Symptom
Possible cause
Remedy
1. FAILURE TO START
Fuel system not o.k.
- No fuel in tank
- Refuel
- Fuel filter clogged
- Clean fuel filter
Fuel not o.k.
- Fuel is not clean
- Replace fuel
- Fuel contains water
- Replace fuel
- Too much fuel in cylinder
- Remove, clean + dry spark plug
- Wrong fuel mixture
- Replace by correct mixture
Spark plug
- Spark plug fouled by oily deposits
- Clean spark plug
- Insulation defective
- Replace spark plug
- Spark gap not correct
- Adjust spark gap (0.6-0.7mm)
High-voltage wire not o.k.
- High-voltage wire broken or loose
- Replace or fix
- Loose coil
- Fix
Compression too low
- Piston ring worn
- Replace
- Piston ring broken
- Replace
- Deposits on piston ring
- Eliminate
- Loose spark plug
- Tighten plug
- Leaking joint between
- Repair
cylinder and crankcase
Compression o.k.
- Connection between high-voltage
- Tightly attach spark plug cap
wire and spark plug not o.k.
- Stop switch defective or
- Repair or replace
short circuit at switch
2. LOW OUTPUT
Misfiring when accelerating
- Fuel filter clogged, lack of fuel
- Clean fuel filter and fuel line; adjust carburettor
Transparent exhaust gases,
- Muffler fouled with oily deposits
- Remove oily deposits
carburettor spits/splutters
Compression too low
Piston, piston ring, cylinder worn
Replace piston, piston ring
Engine is leaking
Joint between cylinder and crankcase
Repair
leaky
Leaky spots at the ends of the
Seal defective
Replace seal
crankshaft
- Engine overheats
- Do not use the device at high speeds and
- Combustion chamber fouled by oily
loads for a longer time
deposits
- Clean combustion chamber
3.ENGINE RUNNING UNSTABLE
Knocking sounds in engine
- Piston, piston ring, cylinder worn
- Replace piston, piston ring
- Piston pin, piston worn
- Replace piston pin, piston
- Crankshaft bearing worn
- Replace bearing
Metallic knocking sound
- Engine overheats
- Do not use the device at high speeds
- Combustion chamber fouled by
and loads for a longer time
oily deposits
- Clean combustion chamber
- Improper petrol type
- Use petrol with correct octane value
Engine misfires
- Fuel contains water
- Replace fuel
- Wrong spark gap
- Adjust spark gap (0.6-0.7mm)
- Wrong contact breaker gap
- Adjust contact gap (0.3-0.4mm)
4. ENGINE SUDDENLY STOPS
- Tank is empty
- Refuel
- Spark plug fouled with oily deposits
- Clean spark plug
/ short circuit
- Spark plug cap is loose
- Attach cap
