Service Manual

2-10 FUEL SYSTEM
Always keep your hands clear of the moving parts.
l Move the throttle lever on dash in the fast idle position and leave it
there.
@Loosen two M6 control panel mounting bolts enough to move the
control panel assembly.
l Carefully move the control panel assembly left or right to obtain the
specified fast idle speed.
*Tighten the M6 Mounting bolts.
Fast Speed
3600 f 75 rpm
l Check the idle speed, and readjust the idle speed if necessary.
ACAlJTlON
Be sure to make the idle and fast idle speeds respectively
correspond to those of the equipment.
A. Control Panel C. Fast Idle
B. M6 Mounting Bolts
D. Open Choke
(Air cleaner is removed for clarity)
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 installihg a
smaller diameter main-jet in the carburetor and readjusting the pilot
screw (idle mixture screw) to meet good idling and idle speed is the
specified rpm.
NOTE
0 The main jet high altitude kits are available if the equipment is to be
used in the high altitudes.
The main jet numbers are stamped on
ends of the main jets.
High Altitude Main Jet
Altitude
Main Jet No.
0 y 1000 m (o-3000 ft)
#112 (STD)
1000 - 2000 m (3000 -6000 ft) #llO
2000 m (6000 ft) and higher #lOS
Main Jet Replacement
l Place the engine (equipment) on a level surface.
l Close the fuel shut off valve in the equipment.
l Drain the fuel in the carburetor completely by unscrewing the drain
screw (C) at the bottom of the float chamber.
ORemove the carburetor (see Carburetor Removal).
l Unscrew the solenoid valve (A), and take off the valve and gasket.
@Using a proper blade screw driver, carefully replace the main jet (B)
with a new one for altitude expected.
@Tighten the main jet to the specification (see Carburetor Disassembly
Assembly Notes).
l install the gasket and solenoid valve.