06 Yz450 @ 4200'

Burned, I will be picking up my new YZ450 this week. In Utah I believe elevation will be averaging around 4200' to 5200' or so...

158 main and a 45 pilot fuel screw 1.75 turns out sound like a good place to start?

thanks in advance

go 160 main jet 48 pilot jet 1.5 turns fuel screw

Thanks for the info Burned.

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