FUEL AND LUBRICATION SYSTEM
4-9
REASSEMBLY AND REMOUNTING
Reassemble and remount the carburetor in the reverse order of
disassembly and removal.
Pay attention to the following points:
• Align the projection
A
on the carburetor body with the slit
B
of
the throttle valve
2
.
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 using vernier calipers. Bend the tongue
1
as nec-
essary to bring the float height
A
to the specified value.
%
Float height
A
: 24.5 – 25.0 mm (0.96 – 0.98 in)
&
09900-20101: Vernier calipers
MIXTURE ADJUSTMENT
• The main jet, jet needle and air screw affect the mixture adjust-
ment.
Before adjusting the air-fuel mixture, make sure that the float
height is correct and the vacuum inlet hose and air cleaner are
in good condition and free of obstructions.
• Ride the vehicle about one kilometer to determine at which
throttle position the engine lacks power or performs poorly.
Then, check the color and appearance of the spark plug and
piston crown.
• The air-fuel mixture can be made “richer” or “leaner” by adjust-
ing the main jet, jet needle or air screw. Throttle position deter-
mines how accurate the adjustment will be.
NOTE:
If the vehicle is tested at 1/2 throttle and either a too rich or too
lean mixture is indicated, then make adjustments with the jet
needle.
• Install the air cleaner case.
• Apply a small quantity of THREAD LOCK “1342” to the threads
of the screws
3
.
'
9900-32050: THREAD LOCK “1342”
• Ajust the following items to the specification.
* Engine idle r/min ....................................................
"
2-7
* Throttle cable play ..................................................
"
2-7
