i have recently bought a 50cc speedfight and it is was compltly standard and topped about 34mph i have just fitted a sport exsaust and now it seems to be goin slower what could be the problem

Daniel, October 2008

Re-Jet It Slightly Higher

www.premier-audio.co.uk, October 2008

Some Exhausts have a restricter in them. look down the top of the exhaust at the front and you'll see a small washer, remove it.
Slow running: Make sure the Throttle and Oil pump are set up right, loss of compression, Brakes binding, Air filter clogged.

Hope that helps :)

paul, Dorset, October 2008