I just put a FMF Pipe and Silencer, and a K&N Air Filter on my sons LT80. It still has the Stock Jetting. Does anyone know if I need to rejet and if so what size? We ride in Oklahoma.

 

Ricky, we are in central Arkansas. I put the same pipe on my daughters and jetted up one size to start with. I ended up putting the original back in it to get it right. Get it warmed up and do a plug check. You should be real close to the original I would think because you are at about the same altitude.Bubba