I have a Kohler MV16 Twin Cylinder Engine on my bench (1979 1300 hours) that is using an excessive amount of oil. (lots of oil smoke out the muffler when running.) I have both heads off, trying to assess what is required to bring it back to normal operation. I have owned this mower since new, and it has never been bored, only one valve job four years ago. The cylinder bore is smooth, no scoring, and within specifications. (It should not need to be resleeved like my last one) There is a LOT of play between the piston, rings and bore. I do not have enough experience to determine how far to go with this. New standard rings, new oversize rings, use old pistons, buy new bigger pistions or what. The last one was easy, I had the bore resleeved to original bore diameter and put in a new standard piston with rings. I don't know what to measure to determine what to do with this one.

I inherited a Toro Recycler through a home purchase and I initially got it working (after having to pour out some of the oil) but it eventually stopped starting. When I try to pull the starter cord, it will move past an inch or two. I only used it briefly a couple times because the grass was very overgrown and it was struggling, but the last time I used it, I turned it off and dumped some more oil out (could have been a mistake) and then couldn't get it to start again. That is, it didn't cut off on its own. It worked and then stopped working. I haven't yet tried penetrating oil, but someone suggested that I might have oil in the cylinder. I removed the spark plug and it did look like there might have been some oil in there, however, when I tried to dump any oil that might be in there out through the spark plug hole, nothing came out. I also can't seem to spin the blade, regardless of what I do. Can I pretty much conclude that only penetrating oil can save the engine, if anything?