Troubleshooting
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2）ENGINE LACKS POWER
3）SUDDENLY STOP THE ENGINE
Phenomen
on
Possible Cause Correction
Ignition system Ignition time not right Replace ignition coil
Fuel path with air Exhaust air
Wrong adjustment of
main jet
Readjustment
Needle valve and main
jet clogged
Clean and blow
Oil cock clogged Clean or replace
Fuel system
Carbon deposit in the
combustion chamber
Clean carbon deposit
Air cleaner clogged Clean or replace Intake system
Intake system clogged Repair or replace
Piston, cylinder piston
ring worn
replace
Leakage between
cylinder and cylinder
head
Replace cylinder head gasket
Valve gap not right Readjustment
When
increasing
throttle
speed up
slowly or
speed
down or
stop the
engine
Compression
poor
Valve sealing leakage Grinding or replacement
Phenomenon
Possible Cause Correction
No fuel Refuel and pass through
Carburetor clogged Check fuel path
Carburetor float leaking
fuel
Repair float
Fuel
system
Needle valve blocked Repair
Spark plugs breakdown,
carbon deposit short
circuit
Replace spark plug
Spark plug electrode
fallen off
Replace spark plug
High tension line fallen
off
Repair and replace
Ignition
system
Ignition coil breakdown Replace
Suddenly stop in
running
Others Serious scuffing and
valve fallen off
Repair or replace damaged parts
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