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3-4 DISASSEMBLY, REASSEMBLY, INSPECTION, AND MAINTENANCE
Carburetor
•
Check how the float valve spring is fitted. Make sure that the first coil
of the float valve spring is completely wrapped in both spring grooves
that are provided at the two ear-shaped protrusions on the float valve
body.
NOTE
Do not unnecessarily disassemble the float valve spring because
this could damage the valve spring.
CAUTION
Do not use large tools to apply excessive force in order to
tighten the screws. Make sure to use a tool that is appropriate
for the respective part and carefully tighten the screws.
•
The screws used for retaining the throttle valve and the choke valve
are crimped at their threaded ends to prevent them from loosening.
Therefore, do not disassemble them unnecessarily.
A: Spring
B: Float Valve
C: Ear-Shaped Protrusion
D: Spring Groove
Adjustment
Ordinarily, it is not necessary to adjust the carburetor because it is
adjusted at the factory to an optimal fuel setting. However, if the engine
runs poorly, follow the procedures given below to adjust the carburetor.
Pilot Screw Adjustment
•
Slowly turn the pilot screw in the clockwise direction until a slight
resistance is felt.
•
Then, back out the pilot screw two turns counterclockwise (for
tentative setting).
•
Install the air cleaner in the normal manner and warm up the engine
by operating it without a load.
•
Set the speed adjustment lever to the low-speed (idling) position.
•
Keep the throttle lever on the carburetor pushed gently to the fully
closed position, and turn the idle adjustment screw so that the engine
attains the idle speed.
•
Keep the throttle lever pushed to the fully closed position, and turn
the pilot screw in and out to find the position in which the idle speed
of the engine is at the highest rpm. From that position, back out the
pilot screw one-quarter of a turn in the counterclockwise direction.
This completes the pilot screw adjustment.
A: Pilot Screw
B: Throttle Lever
C: Idle Adjustment Screw
D: Low-Speed Set Screw
E: Hight-Speed Set Screw
F: Governor Arm
G: Pivot Arm
H: Governor Spring
I: Governor Arm
J: Pivot Arm
K: Snap Pin