I inherited a JD318 with Onan p218g. The hour meter says 500 hours, but I know the engine is a replacement, so the hours are unknown. I pulled the engine to inspect, clean, and adjust the valves. I have been trying to decide if I should just tear it down, re-ring/refresh/hone while I have it out or if I should hold off until I have issues down the road. It ran great when I pulled it and smoked a tiny bit on startup. Take a look at the scoring on the cylinder walls and let me know what you think. Compression is unknown. I know I should have tested it before I tore everything off.