Oh yes compression seem good. It only starts with choke even when HOT?

Thanks man. I will try it out and see how I go. Have just removed the carby and will blow out with compressed air.
Thanks again

Just bought my son a great little sherco 80 (2004). But have a problem getting an even idle. If he lets the throttle go the engine fades. Once its going all is well except for the idle. Can you give me a quick list of things to check. The carby is a Dellorto.