hey i been lookin into sprockets and that quite heavy..and decided id but a 15tooth kit as renthal reckon the standard toothing is 13 which i dont thinkis right but i actally counted the teeth on my one atm and it has 18t .....and only does 75 at a push....ill count rear one and see whats going on reckon its worth gettin a 15t / 16t still or will it just distroy my top speed what confuses me is its still quick thru gears .......id like to get 90ish out of her if its even possible....if it cant be dun thru gearing im thinking biggr carb.....would be cool to have some feed back cheers