I've gotten the engine torn down for the most part and there's a bad build up on the cylinder walls. I'm not sure yet but there may be some pitting. My question is, what's the best way to remove the build up. It's the 4-134 engine and I'm not real sure what the build up is. Wither it's rust or burnt oil or a combination of both. I'm hoping I won't have to replace what looks like sleeves.
Here's what it looked like when I pulled the head off.
And of course the pistons. The rings are so filled up with build up there stuck in place.