I also had my first experience with a blown flywheel-side seal assembly o-ring on my backup 1996 262. I thought it was just a carb adjustment it needed because I couldn't get the chain to stop turning at idle. Or maybe an old clutch spring. But when I turned it on its side when running and the rpm's changed, I knew I had bigger problems. I tore into it, did a pressure test and couldn't even get the gauge to move the leak was so bad. I finally discovered the o-ring under the flywheel seal cover was grossly leaking. I now know why I have heard people saying how nice the older metal seal covers are. This one had the white plastic version and it was REALLY warped. Fortunately I have some metal ones in the parts bin so I'll be putting that back together tomorrow with a new o-ring and crank seal.