hey guys, i've got a late 80's bravo motor and was wondering where the rpm power band is on this motor. also, the steel sleeve does'nt match up very well with the aluminum cylinder at the exhaust port. the sleeve hangs down into the top of the port opening. can i grind the sleeve to match the cylinder or will that make it run worse? any advice would be greatly appreciated. (the motor is going into a golf cart. not much use for snowmobiles down here in the desert).