Short background: Used engine, no compression, wouldn't run. Replaced ring, 'honed' liner, put con rod and new piston in the same position as old. Engine ran fine for several runs of short duration ( 2-3 mins. each run, seemed very hot running to me); engine seized. Top portion of piston and ring broke. Got new piston, waiting on ring. Question: correct orientation of piston/ring gap to cylinder (piston has tiny pin to locate ring)? 'Original' location was on exhaust side toward front of engine. Also, new piston cast '3' inside, old piston '1'-what does that mean. Oh Yea! What should the ring gap be? If too tight how do you hone off the end? Thanks, Bill