Think really hard about what the guy told you concerning the clearances. If there is only supposed to be .007 clearance between the piston and bore but right now there is .020. I know I'm not the greatest at math but to me this means that the cylinder is already .013 oversized for the piston. In other words it's already at a standard .010 over and then some. I can't believe any reputible machinist would even begin to recommend not boring the block to the next standard oversize.
In a worst case scenerio, do or die, your life relied on getting the engine back going, type of situation, I'd at a minimum pressure hone the block to insure the bores were round and then put at least .010 over sized pistons and rings in it. Doing it like this the bore would then be somewhere around .005, or slightly more, too large but even at that it would be alot better than what you've got now at .013 over.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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