I've got a 50cc that's been around the block a few times, actually several times. Hadn't flown it in a while, just noticed two things I think are related. It doesn't like to be at idle, doesn't run all that well and dies sometimes, harder than it should be to start. Also it has lost a good bit of compression. Can hardly feel it. So are these two things related? I'm figuring just put a new set of rings in her and she should be fine. /Thanks.

PS: If I put new rings in her, do I need to go back to break-in oil?