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 MIKUNI 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; 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 38 mm (1.5 in)
Main jet #370
Jet needle 6CHY17-65-3rd
Pilot jet #42.5
Air screw 2 turns out
Float height 8.7 ± 1.0 mm
(0.34 ± 0.04 in)
Setting parts Parts No.
Main jet #360 09491-72011
Main jet #380 09491-76003
Main jet #390 09491-78005
1. Top cap
2. Spring
3. Cable holder
4. * Clip
5. * Jet needle
6. Throttle valve
7. Starter knob
8. Throttle stop screw
9. * Air screw
10. * Main jet
11. * Pilot jet
12. Needle valve ass’y
13. Float
14. Float chamber
15. Holder
16. Power jet
17. Solenoid
18.
Throttle position sensor
1
2
3
4
5
6
7
8
9
12
13
15
10
11
14
18
16
17
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