4-12 FUEL SYSTEM
If the needle valve is worn, as shown in the illustration, replace
the needle valve assembly with a new one. Clean the fuel pas-
sage of the mixing chamber with compressed air.
FLOAT HEIGHT ADJUSTMENT
To check the float height, turn the carburetor upside down. Mea-
sure the float height A while the float arm is just contacting the
needle valve with vernier calipers.
Float height A: 23.4 ± 1.0 mm (0.92 ± 0.04 in)
09900-20102: Vernier calipers
• If the float height A is out of specification, bend the float arm
1 to bring the float height A to the standard range.
• After adjusting, check the float height A again.
REASSEMBLY AND REMOUNTING
Reassemble and remount the carburetor in the reverse order of
removal and disassembly. Pay attention to the following points:
AIR SCREW AND THROTTLE STOP SCREW
• Install the throttle stop screw 1.
The O-rings and gasket must be replaced with new
ones.
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