Service Manual

FUEL SYSTEM 3-17
Carburetor
Fuel Shut Off Solenoid Valve
To avoid after firing when stopping the engine, a solenoid
actuated fuel shut off solenoid valve [A] is installed in the
carburetor bowl. The valve shuts off the fuel supply to the
main jets [B] simultaneously when the switch key turned to
the “OFF” position.
The valve opens automatically when the switch key is
turned to the “Run” position.
FX Models [C]
FR and FS Models [D]
Low Idle Speed Adjustment
•
Refer to the Low Idle Speed Adjustment in the Periodic
Maintenance chapter.
High Idle Speed Adjustment
•
Refer to the High Idle Speed Adjustment in the Periodic
Maintenance chapter.
High Altitude Operation
At high altitude, the standard carburetor air-fuel mixture
will be excessively rich. Performance will decrease, and
fuel consumption will increase. High altitude performance
can be improved by installing a smaller diameter main-jet in
the carburetor and adjusting the idle speed.
NOTE
○
The main jet high altitude kits are available if the equip-
ment is to be used in the high altitude. The main jet
numbers are stamped on the ends of the main jets.
High Altitude Main Jet
Main Jet No.
Altitude
FR/FS FX
L: #110
0 ∼ 1000m(0∼ 3000ft) #124
R: #114
L: #107
1 000 ∼ 2000m(3000∼ 6
000 ft)
#122
R: #111
L: #104
2 000 m (6 000 ft) and
higher
#120
R: #108