I have bought a new de restricted sports exhaust for my speedfight and it was going fine for an hour or so, then i started loosing power. I have been told that my jets in my carb might not be the right size and cant take the power so I want to know what size I should buy,or if there is another problem?

Rob, June 2013

jet up by approx 20, say from a 50 to a 70 main jet but to get max power you'd have to do other work like lighter rollers and remove any restrictors etc, go on the website for these for info.

Perry, July 2013