Had it bored out by a reputable shop in Billings, Mt. He fit the piston to the bore and end ring gap was checked, with in specs. The cylinder was washed out with brake clean and dried and coated with oil. Piston cleaned the same and coated with oil. All parts on assembly were cleaned and assembled the same. Rod journal had a light coat of lithium grease applied at assembly. Head was lapped on glass plate till flat. Valves were ground as well as seats. Valves lapped by me and my brother. Brother is Detroit Mech w/over 30 years experience. New crank bearing on pto end. New valve springs. Cam reinstalled with all shims. Something has gone wrong with the piston and rings because it is using more oil than it should. If carb was set too rich it could wash out the oil in the rings causing failure of the oil rings, I guess. Have built engines in the past and have never had this trouble. Getting older and maybe I'm losing it!
