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
