thank you reyab i have a purgeot speed fight 2 100cc it was creating all the symptoms for a faulty lead i spent nearly £100 getting it fixed everything from miss compression to a new generator but turnes out all it needed was the correct fuel mix ( verry crutial ) as reyab says turn both screws or one (dependant on model) untill it cuts out and turn back one and a quater turns or one and a half this will faulter the performance so have a play till your happy i hope this helps anyone else with the same problem :) happy scooting
john, March 2011
