I raced this class last year and I'm not racing it this year. I had an exhaust, open filter, aftermarket rev box and stiffer springs front and rear. Let me tell you I was wide open on most of the track and I was no where near the guys in the top 3 spots. If you are running a bore kit with a stock cylinder you will have an advantage for sure, it would be a good idea to use an aftermarket rear shock if you don't have one because going through the whoops at minimoto on a stock rear shock is insane, trust me i did it lol. I'm not too sure about your fork tube question though.
Good luck and see you at minimoto.
Good luck and see you at minimoto.
