trx250r 88
05-12-2008, 04:19 PM
i have a all stock 2007 400ex,i am going to do a couple mods to it soon.i recently purchased a hmf sport slip on pipe,and a uni air filter,with a outerwears pre filter.i was thinking about running it with no air box lid or with drilled holes.if anyone has a simular set up ,what should the jetting be? thanks