Suzuki RM125F

4-2 MACHINĘ 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 E-28

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 rangę. It is necessary to have a fuli understand-ing of them for proper carburetor tuning.

Borę Main jet Jet needle Pilot jet Air screw Float height

38 mm #460

6CHY17-62-4th\

#42.5    >

«• /

1 and^: 1/2turns pdt-: 8.7 ± i;ornm^J (0.34 ± 6.04 in)

\

x V

v \ \^x

W X \ ‘

•, ;> \

- X ..    -

V-

fv

\

i *

Setting parts		Parts No.
Main jet	#390	09491-78005
Main jet	#410	09491-82007
Main jet	#430	09491-86002
Main jet	#490	09491-98001

1.	Top cap	9.	* Air screw
2.	Spring	10.	* Main jet
3.	Cable holder	11.	* Pilot jet
4.	* Clip	12.	Needle valve ass’y
5.	^4 Jet needle	13.	Float
6.	Throttle valve	14.	Float chamber
7.	Starter knob	15.	Holder
8.	Throttle stop screw