4-2 MACHINE TUNING
CARBURETOR TUNING
The carburetion of your motorcycle is carefully
selected after extensive testing. You will find that
the carburetion will function smoothly under many
varied operating conditions. For best results, we
recommend that the adjustments and carburetion
jetting should 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 FUNC-
TIONS
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; slow (pilot) 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 39 mm (1.54 in)
Main jet #172
Jet needle NEDH-4th
Cut-away #7
Slow jet #50
Air screw 1 turn out
Power jet #55
Float height 6.5 mm (0.26 in)
Setting parts Parts No.
Main jet #168 09491-33010
Main jet #175 09491-35009
Jet needle NECH 13383-37FC0
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 ass’y
12. Float
13. Power jet
14. Solenoid
15. Throttle position sensor
1
4
2
3
7
6
5
9
12
8
10
14
13
11
15
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