I just got this bike last weekend. It has a Yoshamira Pipe, air box mod and has been rejetted. The last owner also removed the return throttle cable as he was having trouble with the pipe setup, keeping them from wearing out. I just put on a MCCT which eliminated a lot of noise at idle. The bike stalls at idle sometimes. When I try to adjust the idle up with the screw, It either idles too high or when it finally drops down it stalls. The last owner said the tappet is within spec. Any ideas where I should look? Could it need a spark plug? Any suggestions would be appreciated.