07-11 WR450F - All Mountain Jetting?

What are you guys jetted at for mountains?

I will be riding 500ft-9000ft this summer when the snow melts, need good all mountain jetting for it.

Free mods,

07 YZ450F pipe W/ 09 YZF header

O ring mod

Current jets-



42(?) leak

3rd clip on needle(?)

Runs great now but worried it will puke its guts at 7-9000ft


The only difference in my jetting is the 168 main I have been running since the beginning on my '07. I have ridden it up to 9,500'. Just adjusted the fuel screw a bit but that is all. Has run like a champ.

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