FUEL SYSTEM 5-13
NEEDLE VALVE INSPECTION
If foreign matter is caught between the valve seat and the nee-
dle valve, the gasoline 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 gasoline will not flow into the float chamber. Clean the
float chamber and float parts with gasoline. If the needle valve is
worn as shown, replace and the valve seat with a new one.
Clean the fuel passage of the mixing chamber using com-
pressed air.
FLOAT HEIGHT ADJUSTMENT
To check the float height, turn the carburetor upside down.
Measure the float height
A while the float arm is just contacting
the needle valve using vernier calipers.
Bend the tongue as necessary to bring the float height
A to the
specified level.
$ Float height
A
AA
A: 13.0 – 1.0 mm (0.51 – 0.04 in)
% 09900-20101: Venier calipers
REASSEMBLY
Reassemble the carburetor in the reverse order of disassembly.
Pay attention to the following points:
PILOT SCREW
 After cleaning, install the pilot screw
1 to the original setting
by turning the screw in until it lightly seats, and then backing it
out the same number of turns counted during disassembly.
1 Pilot screw
2 Carburetor body
#
NEEDLE JET
 Install the needle jet with its smaller internal diameter portion
facing to the needle jet holder.
Replace the removed O-ring with a new one.
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