11-8 FUEL SYSTEM
NEEDLE VALVE INSPECTION
If foreign matter is caught between the valve seat and the nee-
dle valve, the fuel will continue flowing and overflow. If the valve
seat and needle valve are worn beyond the permissible limits,
similar trouble will occur. Conversely, if the needle valve sticks,
the fuel will not flow into the float chamber. Clean the float cham-
ber and float parts with gasoline. If the needle valve is worn, as
shown in the illustration, replace it along with a new valve seat.
Clean the fuel passage of the mixing chamber using com-
pressed air.
FLOAT HIGHT ADJUSTMENT
• Measure the float height with the vernier calipers. To measure
the float height, tilt the carburetor until the float tip just con-
tacts the needle valve.
Standard float height A: 8.7 ± 1.0 mm (0.34 ± 0.04 in)
09900-20101: Vernier calipers
REASSEMBLY AND REMOUNTING
Reassembly and remounting is in the reverse order of removal
and disassembly. Pay attention to the following points:
• Align the boss A on the throttle position sensor with the
recess B throttle lever shaft.
• Apply THREAD LOCK SUPER to the throttle position sensor
mounting screws.
99000-32110: THREAD LOCK SUPER “1322”
(or equivalent thread lock)
• Temporary tighten the throttle position sensor mounting
screws.
NOTE:
Fit the projection of throttle valve collar in the groove of cable
holder.
Good Worn
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