Tom,
I don't have any experience with these motor bikes, yet, but I have a lot of experience with mechanics in general, engines, and tuning them. I have to agree with Augidog in that it must be set up correctly first. Then it needs to be tuned correctly. I notice you are on the coast, which means low altitude, which means your carburetor may be on the lean side. If I were you, I'd make sure the throttle goes all the way open as Augidog says, and then start tuning to see if there is some more power available. Just my "thoughts".