SETTING

T U N

Effects of the setting parts on the throttle valve opening

1

2

3

4

È 1/8 1/4

1/2

3/4

É

ÈClosed É Fully open

1 Pilot screw/pilot jet

2 Throttle valve cutaway

3 Jet needle

4 Main jet

Main system

The FLATCR carburetor has a primary main jet. This type of main jet is perfect for racing motorcycles since it supplies an even flow of fuel, even at full load. Use the main jet and the jet needle to set the carburetor.

Pilot system

The FLATCR carburetor is manufactured with a pilot screw. The pilot screw adjustment ranges from fully closed throttle to 1/4 open throttle.

7 - 3

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Yamaha WR250FM service manual Effects of the setting parts on the throttle valve opening, Main system, Pilot system