Blew a engine in the last snow storm had way to mutch fun. So went to my bone yard pulled a good runner,well l drove it to yard. First l changed frnt seals when l tried to turn it over to install second belt came up hard clunk back the other way clunk again what the... thinking l had lost a wrench down hole off with its head. It was a big chunk of carbon as the piston is flat spotted on top it filled the gap between the head an piston. So before pulling a engine apart that is suspected having a foreign body try carb cleaner or sea foam an rock it back an forth. 

Edited April 16, 20196 yr by Gramr
Cant spell for spoob

weird

That’s one huge chunk of carbon!  Are you sure it wasn’t a chunk of the piston, or part of a ring landing or a ring?

What’s the bore look like, smooth or gouged out? No rod knock? 

Cheers 

Bennie

Oh balls! Not something you wanna see in or out of your "good runner before it was pulled" engine!

I would do what you're doing, clean her up and get her spinning proper.

Good luck and happy wrenching!