FUEL AND EXHAUST SYSTEMS
deeper into the jet), the mixture gets leaner
(Figure 3): as the clip is put in a lower groove
the mixture gets richer.
On models imported into the U.S. there is
only one fixed needle position. The only
alteration possible is through substitution of a
different needle number or by raising the
needle by putting a washer under it (as the
needle is raised the mixture gets richer).
Needle J e t
The needle jet works in conjunction with the
jet needle. Only one size needle jet is available
for KZ500/550 motorcycles.
Main J e t
The main jet controls the mixture at full
throttle and has some effect at lesser throttle
openings. Each main jet is stamped with a
number. Larger numbers provide a richer
mixture. smaller numbers a leaner mixture.
There is no set rule regarding frequency of
carburetor overhaul. A motorcycle used
strictly for street riding may go 30,000 miles or
more without needing a carburetor overhaul.
Operation in dusty areas or poor air cleaner
maintenance may shorten the useful life ofthe
carburetor. See Table 1 at the end of this
chapter for carburetor specifications.
Remove all 4 carburetors as an assembled
unit. Replacement of an individual carburetor
is described in this chapter under Separation.
1. Put the bike up on its centerstand.
2. Remove the fuel tank as described in this
3. R e m o v e t h e side panels from the
motorcycle and loosen the air cleaner housing
mounting bolts on both sides (Figure 4 and
4. Loosen the locknuts and shorten the throttle
cable adjusters at the handgrip and at the
carburetors for maximum cable free play.
5. Disconnect the closing (front) throttle cable
from the pulley a n d bracket and then
disconnect the opening (rear) cable (Figure 6).
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