Jetting at 4500 feet with WB exhaust

I have an 01' yz426f and have installed a White Bros R4 exhaust system with a White Bros. tapered head pipe. I live and do most of my riding at aprox 4500 feet, however I do some riding between 3000 & 5000 feet. I am looking for some jetting specs that will help me..

I was going to post something but then realized that you have a 426 where I ride a 400. When I installed my E-Series exhaust, I only had to go one up on the pilot jet and 1 1/2 turns out on the fuel screw. It rips now.

I live in Utah and ride at the same elevation.

[This message has been edited by enmerdeur (edited 04-05-2001).]

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