150
Needle valve
B05-2
11.2 Fault diagnosis
Bad startup Startup difficulty，flameout after startup， unsteady idle speed
·Carburetor short of fuel Fuel system blockage
Gasoline filter blocked Too dense or sparse gas mixture
Gasoline pipe blocked Secondary air inlet of suction system
Needle valve conglutination Bad idle adjustment
Bad adjustment of oil level Bad adjustment of oil volume
Idle system or electric enrichment valve blocked
Too much fuel in the engine Too sparse gas mixture
Overfuel and oilflow Oil nozzle blocked
Secondary air inlet of fuel system Needle valve blocked
Fuel deterioration Too low oil level
Bad operation of electric enrichment valve Fuel system blocked
Idle system or choke system blocked Bad act of piston
Secondary air inlet of suction system
Too dense gas mixture
Intermittent flashover in acceleration
Bad operation of enrichment valve · Too sparse gas mixture
Bad operation of needle valve
·Too high oil level
·Oilflow in carburetor
·Air channel blocked
·Filth in air filter
11.3 Disassembly of carburetor
11.3.1 Disassembly
Turn the fuel control switch to “OFF”.
Take away fuel delivery hose. Release throttle cable.
Take away plug on the fuel hose end, drain out fuel from
floater chamber into another case.
Take away the connector from the electric enriching valve.
Loosen the screws connecting the engine connector and air
filter in carburetor, take out the carburetor from them.
Engine
connector
Fuel delivery hose
Fuel pipe plug
Carburetor
connector
Electric enriching
valve connector
Throttle cable
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