Just wondering what would be your best guess as to what is broken inside. Good spark and compression.
* If I spin the engine by hand there is no clanging sound * If I spin the engine with a drill and no spark plug - there is no clanging sound * If I spin the engine with a drill with spark plug connected there is horrendous clanging sound (and there are little, slow puffs of smoke from the exhaust).
I don't usually do any internal repairs except valves. Tempted to have a go. Funny how it only does it when there is compression from the spark plug being fitted. I don't know much about the mechanics inside.
