Ok, after reading many jetting combo's for various pipes, I am questioning what I was told by yoshimura to run. With a yoshimura off-road slip on, They told me via phone to start with a 152-155 main jet if using a k&n filter(I assume with lid on?) raise the needle by one clip, and go to a bigger pilot jet (i again assume 1 size bigger pilot jet). we did not touch on if to change air/fuel mixture. do these sound right to you? after reading all this, I'm not sure. also what is stock main jet size anyway? hey thanks again, and I'm sorry about another jetting question. Paul