Well i got home from an amazing ride and thought lets learn some general maintenance for my newish bike. (09 gs500) Took the tank off (after closing the valve etc etc all that jiber jaber) Air filter is disgusting and ratty..need a new one... I know you have to rejett the carb after i do this. Any people have said run it a bit rich. but i dont know how to do it. How much will rejetting cost at a local shop?