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Discussion Starter · #1 · (Edited)
400 ex set up questions

Hello!. New to the site. Picked up an 03 400 ex this summer and I want to dial it in. I put a baffle replacement in the end of the pipe with a spark arrestor in it. Now I'm considering an air box cover with a pre-filter in it.
What jetting changes do you recommend?

Also, I'd like to bet a little more top end out of it for fast trail running. What are the stock sprockets? And what changes are recommended?

Last one - I'd like to check the valve clearance. What is the spec? Same procedure as other 4 strokes?

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