5-12
FUEL
AND LUBRICATION SYSTEM
INSPECTION
Check the following items
for any
damage
or
clogging.
If any
damages
are found, replace the
damaged
parts
with
new ones.
*
Pilot jet
*Main jet
*Main air jet
*
Pilot air jet
*
Needle jet air bleeding hole
*
Float
*
Needle valve
*
Jet needle
*
Valve seat
*
Piston valve
*
Starter (enricher) jet
*
O-ring
*
Throttle
valve
*
Diaphragm
*
Pilot outlet and by-pass ports
NEEDLE
VALVE INSPECTION
If
foreign matter is caught between the valve seat and the needle
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
it and the
valve seat
with
and a new one.
Clean
the fuel
passage
of the mixing chamber using compressed
air.
u
CORRECT
INCORRECT
FLOAT
HEIGHT ADJUSTMENT
To check the float height, turn the carburetor upside down.
Measure
the float height
®
while the float arm is just contacting
the
needle valve using vernier calipers.
Bend
the tongue
as
necessary to bring the float height
®
to the
specified
level.
09900-20101:
Vernier calipers
RISES
Float
height
®: 13.0 ± 0.5 mm (0.51 ± 0.02 in)
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