120
11.2 Failure diagnosis
Abnormal startup Difficulty in startup, flameout after startup,
unstable idle speed
No fuel in the carburetor Blocked carburetor
Blocked oil filter Too dense or dilute mixed gas
Blocked oil pipe Secondary air suction into the air intake system
Adhesive needle valve Idle speed maladjustment
Oil level maladjustment Oil volume maladjustment
Blocked idle speed system or electric enrichment valve
Too much fuel in the engine Too dilute mixed gas
Oil spilling
Blocked oil jet
Secondary air suction into the fuel system
Blocked needle valve
Fuel deterioration Low oil level
Abnormal enrichment valve Blocked fuel system
Blocked idle speed system or choke system Abnormal plunger
Secondary air suction into the air intake system
Too dense mixed gas Interrupted spark at acceleration
Abnormal enrichment valve Too dilute mixed gas
Abnormal needle valve
Over high oil level
Oil spilling from the carburetor
Blocked air channel
Dirty air filter
11.3 Carburetor disassembly
11.3.1 Disassembly
Turn fuel switch to "OFF".
Remove the oil inlet pipe and loosen the throttle cable.
Remove the plug of the oil drain pipe and discharge fuel in
the float chamber into another box.
Remove the connector of electric enrichment valve.
Loosen the screws of carburetor to the engine connector and
the air filter connector; remove the carburetor between two
connectors.
Oil inlet pipe
Electric
enrichment valve
connector
Throttle cable
Engine
interface
Carburetor
interface
Blocked oil
pipe
