4. Fuel System
4-8
Assembly
Install main jet, fuel needle jet holder, nozzle, idle
jet and air-fuel mixture adjustment screw.
Caution
z Set the adjustment screw in according to
number of turns noted before it was removed.
Install the float valve, float, and float pin.
Checking Fuel Level
Caution
z Check again to ensure float valve, float for
proper installation.
z To ensure correct measurement, position the
float meter in such a way so that float
chamber face is vertical to the main jet.
Fuel level：16.0 mm
Installation of carburetor
Install carburetor in the reverse order of removal.
Following adjustments must be made after
installation.
y Throttle valve cable clearance adjustment.
y Idle speed adjustment.
Idle Speed Adjustment
Caution
z Air amount adjust screw was set at factory,
so no adjustment is needed. Note the number
of turns it takes to screw it all the way in for
ease of installation.
z Never screw in forcedly to avoid damaging
the screw seat.
z The main stand must be used to support the
motorcycle to perform the adjustments.
Use a tachometer when adjusting engine RPM.
Screw in adjustment screw gently, then back up to
standard turns.
After warm up engine, then adjust the stopper
screw of throttle valve to standard RPM.
Connect the sampling hose of exhaust analyzer to
exhaust front end. Press test key on the analyzer.
Adjust the fuel amount adjustment screw and read
CO reading on the analyzer
CO standard value：1.3~2.0 %
Accelerate in gradual increments, and make sure
both rpm and CO value are in standard values
after engine running in stable. If rpm and CO
value fluctuated, repeat the procedures described
above
Air-fuel mixture
Float level gauge
Adjustment nut of throttle cable
The stopper screw of throttle valve
Air-fuel mixture adjustment screw
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