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Originally Posted by CharlieB
DO NOT... I repeat DO NOT pull the head!!! There's no reason on earth to do that and it will give you absolutely no answers + cost time and $. First off running with the needle valve closed indicates another problem to me. Actually I didn't think it was even possible to start/run that way. Truthfully I'm not very familiar with the carb you have so that might not be right. Secondly if a valve was hanging up it's very likely you'd hear something. An intake valve would pop back thru the carb and an exhaust would pop thru the tail pipe Not hearing either one? It's very likely not a valve. I'm more with the ign. people right now. Perhaps a worn distributor bushing is the problem. It would cause missing at various times by messing with the point setting. Good Luck and get help if you need it.
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I think you just helped me with your comment on the tail pipe pop. I will listen to some of my videos and see if it pops.