My 1986 Honda trx250 is geared too low. It has a shaft drive and I'm wondering if there's a way I can get into the transmission and somehow change the gearing so that I can increase my speed. If I have a run at a hill in fifth, I can still climb it and I lose little power. What I want to do is make 3rd gear go a little quicker, make 4th gear a little quicker and this will eventually make 5th gear a little more quick than a little quicker. Is this possible?