We had a D in the same shape (18 thousands of taper), and were debating between an overbore to 45 or boring and sleeving back to standard. Sleeved back to standard to keep the low compression pistons. The price was going to be about the same either way...roughly $1000 bill after all was done, bushings and piston pins as well.
The tractor starts great and runs great too.
If you want it to start and run reliably (especially hand start), I'd really suggest getting a good clean bore, boring or sleeving.
Don't forget to check for piston pin wear, ours were wiped out too.
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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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