Technical data

Section 06 FUEL SYSTEM
Sub-Section 03 (CARBURETORS)
06-03-3
GENERAL
The following illustration shows which part of the
carburetor begins to function at different throttle
plate openings.
VIEW FROM AIR INTAKE OPENING
1. Throttle plate openings
2. Throttle plate closed
3. Throttle plate wide opened
4. Low-speed screw
5. Pilot Jet
6. Main jet and high-speed screw
CARBURETOR REMOVAL
To remove carburetors from engine, proceed as
followsþ:
Remove air vent tube support (SPþ/þXP series).
Remove air intake silencer. Refer to FUEL SYS-
TEM 06-02.
Turn fuel valve to OFF position.
Disconnect pulse line from fuel pump.
Disconnect fuel supply line from fuel pump.
Disconnect fuel return line.
Disconnect oil injection pump cable, throttle cable
and choke cable.
Twin Carburetor Models Only
16,17, Screw and Lock Washer
Remove screws and lock washers retaining car-
buretors.
Remove carburetors.
Single Carburetor Models Only
Remove 4 bolts and lock washers from rotary
valve cover then move carburetors and rotary
valve on top of engine.
NOTE : When removing rotary valve cover,
pay attention that the rotary valve will stay in
place, otherwise it must be timed.
Remove carburetor from intake manifold.
CLEANING
The entire carburetor should be cleaned with a
general solvent and dried with compressed air be-
fore disassembly.
CAUTION : Be careful at carburetor clean-
ing not to remove paint. Paint removal
will cause carburetor to rust very rapidly. Re-
paint if necessary.
Carburetor body and jets should be cleaned in a
carburetor cleaner following manufacturer’s in-
struction.
WARNING : Solvent with a low flash point
such as gasoline, naphtha, benzol, etc.,
should not be used as they are flammable and
explosive.
CAUTION : Heavy duty carburetor cleaner
may be harmful to the rubber parts, O-
ring, etc. Therefore, it is recommended to re-
move those parts prior to cleaning.
Inspect O-rings, diaphragms and gaskets.
DISASSEMBLY AND INSPECTION
Inspect parts for corrosion damage (shaft, throttle
plate, spring, screw, check valve housing, etc.).
1, Needle Valve
Inspect needle valve tip for a grooved condition. If
worn, needle and seat must be replaced as a
matched set.
1
F01F13A
2
3
4
5
6
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