Yamaha YZ426F/LC Fahrer- Und Wartungs-Handbuch Seite 566

T U N
SETTING
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. The main air jet has
almost no effect on the air-fuel mixture. Use
the main jet and the jet needle to set the car-
buretor.
1 Jet needle
2 Main air jet
3 Pilot air jet
4 Needle jet
5 Main jet
6 Pilot jet
7 Pilot screw
Pilot system
The FLATCR carburetor is manufactured with
a pilot screw. The adjusting range of the pilot
screw is limited by the throttle opening during
idling. Therefore, even a large adjustment of
the pilot screw will have no effect until the
throttle is 1/8 to 1/4 open.
To set the pilot system of the carburetor,
adjust the pilot jet and pilot air jet, while mak-
ing sure not to adjust one without adjusting the
other. Do not adjust the pilot screw.
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