the rev max box changes your timing to +4. if your timing is already advanced to +4 then you are at +8 and your bottom end is pretty much nonexistant. set your timing back to 0 and give it a shot. if you feel you need that cdi. bansh-eman is right, that thing isn't going to raise your rpms (pipes) and it will not give you hotter spark (coil). if it ran good before why mess with it? if you have an adjustable timing plate, play with the timing to get the performance you want. good luck.