fuel screw

hey all,

got a question regarding the fuel screw. I was told you can use the fuel screw to adjust to high altitude without changing the main jet. so this true also which way would you turn to lean the bike?

Fuel screw is for idle only. To lean it, you would screw it in.

You still have to deal with a main jet and needle and needle clip position for altitude changes.

Realistically, a YZ450 can run well with the same jetting through a 4000 foot range.

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