Honda HHT25S Manual page 26

HHT25S•HHT35S
PROBABLE CAUSES OF MAJOR CARBURETOR PROBLEMS
Probable causes
Throttle stop screw out of adjustment
Fuel tank/line
Pump diaphragm
Primer bulb
Carburetor not installed securely
Insulator gasket faulty
Metering lever
Metering lever spring
Metering diaphragm
Inlet needle valve
Fuel filter restricted
Fuel line restricted
Air mixing in fuel passage
Incorrect/deteriorated fuel
Vacuum pulse leaking
Vacuum pulse passage restricted
Loose pump cover screw
Pump diaphragm faulty
Primer bulb damaged
Check valve faulty
Lever damaged
Lever too high
Lever too low
Lever not operating properly
Spring deformed
Spring not installed properly
Diaphragm damaged or faulty
Gasket faulty
Stuck valve
Worn valve
Foreign matter stuck in valve
Symptom
Starting Low speed
O O O
O O O O
O O O O
O O O O
O O
O
O
O O O
O O
O O
O O O
O O
O O O O O O
O
O
O O O O
O O O
O O
O O O O
O O O O
SERVICE INFORMATION
High
Acceleration/
speed
deceleration
O
O O O
O O O
O O
O
O
O
O O
O O
O
O
O
O O O
O
O O O O
O
O O
O
O
O
O O
O O
2-15
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O