well i race long track on mablethorpe beach. i have a xt 660 engine in a tt600 frame. high comp wiseco piston, stage 2 hotcam. szr front pipes with track mega phone rear can. original carbs keep seizing up and breaking the connector rod. so iv converted it to raptor carbs. i change the manifolds and they fit fine. engines are the same. my cam and piston are out off a raptor. it res half way then dies and backfires loud. i have changed the cdi. i didnt know if i needed to set the carbs up different cherers