Help 2001 Yz 426

i ride a 2001 yz 426 stock pipe ride desert and purchased a pro circuit t-4 got it already havent installed it yet but im about 200 feet above sea level and was wondering what size jet or jets should i run



Try stock first. It might run great.

If you need anything at all it will only be one size larger on the main. Like the man said, try it first. If it goes flat on the top, just bump the main one size.

I run a full FMF Ti system on my 01 426 and made no jetting changes...runs perfect...Im in the central valley.

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