Is the bike a "basket case" bike, or was it in running condition? If it was in running condition, then it should just be a matter of making sure the pistons are level with each other and slowly working the cylinder back and forth and pulling up slightly, maybe a few taps of a rubber mallet too. If it is a "basket case", you might have to soak in PB Blaster penetrant for a few days.
It's a running bike with a new valve job. But it has real low compression on one cylinder and need a rings - or maybe even a over-bore and new pistons. I need to get the cylinders off to tell.
The crank rotates and the pistons go up and down. And so far I've tried a few blows with a rubber mallet around the outside of the cylinders and a few with a dead blow hammer using a piece of 4/4 as a go-between against cylinders.
Using a sharpened gasket scraper, tap it into the gap between the crankcase and the cylinders at various points around the engine. A little bit at a time, don't get violent. 2 or more scrapers makes it easier/faster.
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