Needs rings, bearings, gaskets, possibly pistons. Had topped up the oil, then worked it for two days moving a burn pile. The next day it wouldn't start. Low compression. I blamed an inadequate air filtration system, but it was almost out of oil! Don't know how that happened in tow days. there are no leaks. Where can I get rings, pistons, gaskets, bearings for my 3 cylinder? Is there a John Deere model whose parts I can substitute?