OK guys I'm adding some mod's to the kids new 250EX. I've added a White brother E-series exhaust and a Uni-filter. How many vents should I add before I start re-jetting? I sure like the sound this new exhaust puts out and so do my neighbors.[img]i/expressions/face-icon-small-happy.gif[/img]

 

i have to 3 1" diameter holes, its gives good flow

 

Thanks. That's about what I was thinking. I figure any more might as well just run with no lid at all.

 

U have an exhaust and a uni filter and u didnt rejet it yet? Careful could be running lean.