well thanks for all the advice on here, did my sons kymco 50cc scoot over the last couple of weeks, first cut the cdi box...very carefully and did a v shaped cut..that way you can see where and what your cutting.
that inceased his speed from 30 to 35-36 mph, then bought a new boss/sleeve and fitted that, now its up to 40-45mph, so well hapy wit the results
thanks all you guys, guess your all young, but great advice on here thanks