I was just wondering what primary spring and weights people were running with RcR trail porting on a 400 sport/scambler. I think i have the motor tuned just about right but the shift out feels a bit funny. I have a team secondary,and a aaen green primary. I also had the head shaved to raise the compression to run 93 octane pump gas.

 

just call up rick and ask him. hes really good with that kind of stuff. if its shifting out at high rpm's thats ok. mine probably engages around 2000-2500 rpm's