A buddy of mine has a 250x, and is going to put on a pipe and already has a k & n air filter. We are not really sure what the main jet size should be. He's getting the dg pipe with the over sized header, if that makes any difference. Any comments would be appreciated. Thanks.

Bryan

 

hey my 300ex i had had full pipe and k a n filter no lid i was running a 125 main but i think it was a little lean we are at 1174 ft out here