Started backfiring slightly and missing some at lower rpms, especially when backing off throttle. So, it seems to be using too much oil, like over a quart in 2 long, rough days. LOTS of debris, rocks, obstacles, already threw a blade & hub almost lost a quill, bent deck several times, blades are pounded of course. I immediately put it to hard work mowing, running at 3/4+ throttle for a few hours. Haven't 'dialed in' carb but got it running and it ran good, but not excellent. Used lots of assembly lube, staggered my ring gaps, did a hand lap valve job, changed valve seal & adjusted valves, rebuilt carb, set armature gap. Honed it lightly first, and dial-bore gauge showed stock bore specs all the way down in 4 directions. Then rebuilt engine with new piston, rings & rod, new gaskets & seals, but had to re-use head gasket. Went through the whole machine, rebuilt or replaced everything.
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