Well DJHeptic I tried your ideas and the bloody thing is still the same!!! I popped a new glow plug in it to start and tried that. No difference so then I put on the new 100cc fuel tank and tried again. The bloody thing will just not stay running for longer than a few minutes. The guy in the model shop checked the compression yesterday and said that it was fine so now I am back to square one and after some more ideas as to what it could be. Its got to be an air leak somewhere hasn't it?? Where are the most common places for theses stupid engine to get an air leak from?? And what exactly on the engine should be sealed with high temp sealant because there does not seem to be sealant on anything from what I can see.

Adam