FUEL SYSTEM 4-10
INSPECTION AND ADJUSTMENT
CARBURETOR PARTS
Check the following items for any damage or clogging.
If they are clogged, clean the fuel passage.
* Pilot jet
* Gasket and O-rings
* Main jet
* Pilot passageway
* Starter plunger
* Starter passageway
* Float
* Needle jet
* Throttle valve
* Needle jet holder
* Needle valve seat
* Throttle stop screw
* Needle jet bleeding hole
* Needle valve
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
needle valve is worn beyond the permissible limit, 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 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.
NOTE:
When measuring the float height, remove the gasket.
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
.