I have an old McCoy 35, it was the first big engine that I ever bought. Cost me $3.95 in 1963, I wore the main bearing to the point it wouldn,t runwell anymore. I had asked one of my friends if he knew a way to fix this problem. This friend is Bob Zambelli, he told me how to replace the bearing. I told him that I didn,t have any machine tools to do this type of work, to which he replied send it to me. I did and it was returned in a couple of days with a new main bearing and the crankshaft polished. These are the kind of people that our sport has in it that makes it so much fun. Thankyou Bob. I need to find out if I can have the piston hardened or chromed so that the new p/c assembly that I have will last longer than they normally do with a muffler. George