This all sounds like it's easier to just remove the engine, take it apart, clean it, hone the cylinder, replace the rings, the top and bottom main seals, the head seal and put it together again. Can't take more time or money than running back and forth to find out if a chonda copy will fit.
Or, buy a new mower if you feel that the deck and engine has done it ca. 1000 hrs of hard work for you.
Or, buy a new mower if you feel that the deck and engine has done it ca. 1000 hrs of hard work for you.