Yesterday I removed ANOTHER 420 motor. This one belongs to a friend of mine's son. It had a rattle in the motor under rev. Not a knock. High pitched rattle.
I recorded it and sent it to shadetree and he said it sounded like a cam chain, and I thought that made sense. It was loudest in reverse, but would do it in neutral too, just not quite as bad. Only does it under throttle.
I took the front case off this morning expecting to find a loose/stretched cam chain or a bad tensioner, but everything was tight and the tensioner couldn't be pushed in (at least by hand).
Any other places to look? I'm going to go ahead and split cases since I have it this far down. Clean it out good. Any areas in the transmission that are problematic on the 420's that could cause a rattle in neutral?
I recorded it and sent it to shadetree and he said it sounded like a cam chain, and I thought that made sense. It was loudest in reverse, but would do it in neutral too, just not quite as bad. Only does it under throttle.
I took the front case off this morning expecting to find a loose/stretched cam chain or a bad tensioner, but everything was tight and the tensioner couldn't be pushed in (at least by hand).
Any other places to look? I'm going to go ahead and split cases since I have it this far down. Clean it out good. Any areas in the transmission that are problematic on the 420's that could cause a rattle in neutral?