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usmcYZ450

carb screw

4 posts in this topic

Hey on the 09 yz450 the mixture screw which dirction leans it out and which richens it now this is the big screw on the left side sitting on the bike :smirk:

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now this is the big screw on the left side sitting on the bike :smirk:

The big screw on the left side is the idle adjustment screw. The screw on the bottom of the float bowl is the fuel screw for adjusting the the pilot circuit richer/leaner.

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