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Table of Contents
FUEL AND EXHAUST SYSTEMS
157
Jet and idle mixture screw
removal/installation
1. Remove the float bowl screws. lockwashers
and the float bowl and gasket (Figure 16).
2.
Push out the float pivot pin (Figure 17) and
remove the float assembly.
3.
Remove the float needle. float valve and
gasket (A. Figure 18).
4. Unscrew the main jet (B. Figure 18) and
pilot jet (C).
5A.
On U S . models,
unscrew the needle jet
holder and O-ring (under the main jet). Turn
the carburetor upside down or push the needle
jet out from the carburetor bore (Figure 19).
5B.
On other models,
unscrew the needle jet
and O-ring (under the main jet).
6.
Remove the idle mixture (air) screw, spring
and O-ring.
NOTE
On
US.
models,
the idle mixture screw
is covered by a plug
(Figure
20) bonded
i n place at t h e f a c t o r y . W h e n
disassembling t h e carburetor for
overhaul, the plug should be removed in
order t o clean t h e passage with
compressed air. Before removing the idle
mixture screw, count the number of
turns it takes to seat it lightly.
7. To assemble, reverse this procedure. Note
the following:
a.
On non-U.S. models,
t u r n t h e idle
mixture screw in until it seats lightly, then
back it out the number of turns specified
in Table 1.
On U S , models,
turn the mixture screw in
until it seats lightly, then back it out the
same number of turns noted during
removal. Install a new plug and seal the
edges of the plug lightly with silicone
sealant.
Tighten the jets securely. but be careful
not to strip their threads.
Inspect the float bowl gasket and replace
it if damaged. If there is much residue in
the float bowl, the carburetor body
should be cleaned thoroughly.
After assembling the carburetor, turn it
upside down and listen to hear if the
floats are moving freely.
Perform Fuel Level Inspection and Idle
'Mixture Adjlrsttnent as described in this
chapter.
Throttle slide and jet needle
removal/installation
The throttle slide and jet needle can be
removed without separating the carburetors.
1. Remove the idle adjust knob, washer and
spring (A. Figure 21).
2. Remove the throttle return spring (B.
Figure 21).
3. Remove the 3 screws and the carburetor top
cover and gasket from each carburetor (Figure
22).
4. Remove the throttle arm screws and the fast
idle arm screw (Figure 23).
5. Remove the throttle pulley mounting
screws.
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Zx550Kz550Kzx550

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