4-2 MACHINE TUNING
CARBURETOR TUNING
The carburetion of your motorcycle was carefully
selected after extensive testing. You will find that
the carburetion will function smoothly under many
varied operating conditions. For best results we rec-
ommend that the adjustments and carburetion jet-
ting be left “as is” from the factory.
Some riders may operate their motorcycle under
extreme operating conditions such as; very high
altitudes or extreme cold and hot temperatures. In
these circumstances the jetting of the carburetor or
other adjustments may need to be altered slightly.
Riders who are not familiar with the operation and
jetting procedures of the KEIHIN carburetor should
have their local authorized Suzuki dealer perform
these alterations. Mechanically experienced riders
can alter the carburetor settings based on the fol-
lowing information and specifications.
Carburetor Specifications
PRINCIPLES OF CARBURETOR
TUNING
CARBURETOR COMPONENTS AND
FUNCTIONS
The carburetor consists of a number of parts as
shown below. The asterisk (*) marked parts are pre-
cisely machined, which meter the intake air (oxy-
gen) and fuel so that the air/fuel mixture ratio is
controlled accurately. They can be divided by three
operation-related groups; pilot (slow) system, inter-
mediate system and main system, and they achieve
their functions in each corresponding throttle open-
ing range. It is necessary to have a full understand-
ing of them for proper carburetor tuning.
Bore 28 mm
Main jet #128
Jet needle 24NAAH-3rd
Slow jet #50
Air screw 2 turns out
Float height 19 mm (0.75 in)
Setting parts
(included parts)
main jet: #125, #130, #135
1. Top cap
2. Spring
3. * Clip
4. * Jet needle
5. Throttle valve
6. Starter knob
7. Throttle stop screw
8. * Air screw
9. * Main jet
10. * Slow jet
11. Needle valve
12. Float
13. Float chamber
14. Jet holder
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8
7
6
11
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