check there is petrol getin to the cylinder, clean your carb, pipes and filters. If there is still no joy it could be your cdi unit which I have just had to replace on my speedfight 2 because I had the same problem. The immobiliser kept coming on its self and cutting out the engine yours might be doing the same.
shaun
December 2009
well it sounds like a fuel starvation problem you need to enhance the problems symtoms more for us to distinguish the real reason though.
adam bike doctor
November 2009
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