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Kawasaki FB460V Carburetor
Kawasaki FB460V Carburetor Operation
In the choke or start position, the choke valve is closed, and the only
air entering the engine enters through opening around the valve. As the
starting device is operated to start the engine, the air pressure in the
carburetor is reduced as air drawn into the engine.
Since the air passage is blocked by the choke valve, fuel is drawn from
the main nozzle and from both idle fuel discharge ports and mixes with
the air that passes through the throttle valve. This makes a very rich
fuel mixture required to start a cold engine.
At idle a relatively small amount of fuel is required to operate the
engine. The throttle is almost closed, shutting off the fuel supply from
all except the one idle fuel discharge orifice, so that the suction
created by the engine draws fuel only from that orifice. During
intermediate operation, second and third orifices are uncovered as the
throttle valve opens, and more fuel is allowed to mix with the air
flowing into the engine.
During high speed operation, the throttle valve is fully opened. Air
flows through the carburetor at high speed. The venturi, which decreases
the air passage through carburetor, further accelerates the air flow.
This high speed movement of the air decreases the air pressure, and fuel
is drawn into the air stream through the main nozzle that opens into
venturi, mining with the air in the air passage.
As the engine load increases, air is automatically bled into the main
nozzle through the air jet located in the air horn. This allows fuel to
be metered freely from the main nozzle and to be facilitated
atomization.
General Specifications
Main Jet (FB460V-AS) - #112.5
Main Jet (FB460V-BS) - #115
Pilot Jet - #47.5 / #47.5
Pilot Screw (Turn out) - 1-1/8
Float Valve - 1.5 mm (0.059 in.)
Low Idle Speed - 1350 to 1450 rpm
Fast Idle Speed - 3275 to 3425 rpm
Float Level - Float parallel to carburetor body-to-bowl mating surface.
Kawasaki FB460V Carburetor Adjustment
Adjust idle mixture
Air cleaner must be assembled to engine. Turn idle mixture screw (B) in
until it just seats, then back it out 1-1/8 turns. Do not turn the screw
in too far. The pointed end of valve seat is susceptible to damage.
Start and allow engine to warm. Move throttle lever on equipment to
"IDLE POSITION".
Use a tachometer and adjust throttle stop screw (A) to obtain 1350 to
1450 rpm by turning it in or out while holding the end of the screw
against carb body. Adjust idle mixture screw (B) by turning clockwise
(lean) or counterclockwise (rich) to obtain the peak of idling. Turn
idle mixture screw (B) back out 1/4 turn more. Use a tachometer and
readjust throttle stop screw (A) to obtain and satisfy specified 1350 to
1450 rpm idling. Stop the engine.
Removal and Disassembly
Before removing for repair, check for signs of air leakage, or mounting
gaskets that are loose, deteriorated, or otherwise damaged. Do not bent
the links or stretch. Pull carb free, and gently twist carb. to free
link rod. Remove governor link rod and link spring. Disassemble carb.
Kawasaki FB460V Carburetor
Disassembly: 1 - Screw, 2 - Throttle valve, 3 - Screw, 4
- Choke valve, 5 - Screw, 6 - Spring, 7 - Spring, 8 - Pilot screw, 9 -
Pilot jet, 10 - Drain screw, 11 - Spring, 12 - Spring, 13 - Ring, 14 -
Ring, 15 - Gasket, 16 - Needle valve, 17 - Float pin, 18 - Clip, 19 -
Float chamber, 20 - Choke shaft, 21 - Throttle shaft, 22 - Ring, 23 -
Seal, 24 - Float, 25 - Main nozzle, 26 - Main jet, 27 - Washer, 28 -
Bolt, 29 - Bleed pipe, 30 - Spring
Cleaning and Inspect
Place carb body and parts in PT503 cleaner or its equivalent. Do not put
gaskets and plastic parts in cleaner. Parts should remain in cleaner for
1 or 2 hours. Remove and rinse with solvent. Rinse carb body in hot
water to neutralize corrosive action of cleaner on aluminum. Dry parts
with compressed air. Be sure all holes are open. Do not use rags or
paper to dry parts. Lint may plug hole or passages.
Inspect carb body for damage. Flange sealing surfaces should be smooth
and free of burrs and nicks. Replace gasket if necessary. Inspect pilot
screw and drain screw for wear at the seating surface. Inspect for weak
springs. Inspect main jet, bleed pipe, main nozzle and pilot screw for
damage. Inspect inlet needle valve for wear or damage at the seating
surface. Inspect clip for damage. Inspect the other parts of carburetor
for wear, damage.
Assembly and Installation
Reassembly is the reverse of removal. Note the following points: Install
main nozzle, bleed pipe, and main jet by turning clockwise into
carburetor body. Do not over tighten screws. Install pilot screw
(mixture screw) and spring finger tight. Install pilot jet screw by
turning it clockwise into carb body.
Do not over tighten. Install float and float pin. Do not push on float
or, inlet needle valve when adjusting float level. When carburetor is
upside down, float surface (A) must be parallel to carburetor body (B).
To adjust float surface angle, bend tang (C) with needle-nose pliers.
Install throttle linkages and choke linkage on carburetor. Install
breather connector on intake pipe. Assembly gaskets, heat shield plate,
carburetor, gasket and intake pipe. Install carb assembly on inlet pipe
with through bolts.
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KOHLER ENGINES SPECS AND SERVICE DATA |
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KAWASAKI ENGINES SPECS AND SERVICE DATA |
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BRIGGS AND STRATTON ENGINES SPECIFICATIONS |
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HONDA ENGINES SPECS AND SERVICE DATA |
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