Pilot System; Main Jet Adjustment; Effects Of Changing The Main Jet (Reference) - Yamaha YZ450F(W) Owner's Service Manual

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SETTING

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.

Main jet adjustment

The richness of the air-fuel mixture at full throt-
tle can be set by changing the main jet 1.
Standard main jet
If the air-fuel mixture is too rich or too lean, the
engine power will drop, resulting in poor accel-
eration.

Effects of changing the main jet (reference)

È
1/4
È Idle
É Fully open
7 - 4
T U N
#160
É
1/2
3/4
#162
#158
+10%
#160
–10%

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This manual is also suitable for:

Yz450f 2007Yz450f w 2007Yz450f 2006Yz450fw 2006

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