I went to went to run my YS 140 over the weekend and found there was no compression. It hadn't been run in over a year but had been stored with Ultra Oil from Performance Specialties. We got it running but not with good power and way too much smoke no matter where the needle was. I figured it was valves or rings so I removed the head and everything was fine there...must be a stuck ring. Any suggestions on how to loosen up that ring without doing a complete teardown? I've tried a little oil down the cylinder to try and loosen the ring but with no success. Any advice would be appreciated.

Thanks,
paul