Failure Diagnosis; Carburetor Disassembly - KEEWAY FACT 50 4T Maintenance Manual

11.2 Failure diagnosis

Abnormal startup
No fuel in the carburetor
Blocked oil filter
Blocked oil pipe
Adhesive needle valve
Oil level maladjustment
Too much fuel in the engine
Oil spilling
Secondary air suction into the fuel system
Fuel deterioration
Abnormal enrichment valve
Blocked idle speed system or choke system
Too dense mixed gas
Abnormal enrichment valve
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.
Difficulty in startup, flameout after startup,
unstable idle speed
Blocked carburetor
Too dense or dilute mixed gas
Secondary air suction into the air intake system
Idle speed maladjustment
Oil volume maladjustment
Too dilute mixed gas
Blocked oil jet
Low oil level
Blocked fuel system
Abnormal plunger
Interrupted spark at acceleration
Too dilute mixed gas
Blocked idle speed system or electric enrichment valve
Blocked needle valve
Secondary air suction into the air intake system
Oil inlet pipe
Engine
interface
120
Throttle cable
Electric
enrichment valve
connector
Carburetor
interface
Blocked oil
pipe