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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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