So I've got an old SL350 I'm trying to get running, but I've got a few questions... It's not currently running. The PO said it needed points, which he had but had not installed. No problem, right? I tested for spark - and sure enough, nothing. OK - in go the points. Spark is good. Bike still won't fire up. A quick compression test reveals low numbers - 90 psi on it's own, as much as 115 with a spoonful of oil down the cyls. I also adjusted the valves, with a cold bike (gotta be cold - it won't start!). Recheck compression - still 90ish, and up to 115 with oil added. Those figures are low, I realize that. Are they "there's no way it will start" low? Any input on this one? Is this a set of rings, at the very least? Or maybe a head gasket - or both? You wouldn't do one without the other...I got that. Prob have to just pull the head to get an idea of what all is going on in there first, yeah?