Interesting debate going on down there. Both sides are right, the only question that remains is....what is RIGHT for you? I've always tried to err on the safe side and go with new sleeves and pistons. That being said, as I get older and look back, it looks to me like I've wasted some money. If the tractor didnt smoke or use oil and if the cylinders are not scored up, drop a bearing or 2 and take a look. If bearings are not scuffed and worn, rings should still be decent as well. At that point, you have simply done a valve job and took a look at the lower end and tightened up some leaks. You do run a slight risk of the tractor sucking oil past the rings, but even if it does use a little oil, as long as it doesnt smoke, you can afford to buy a little oil. That being said, if you even suspect you may end up asking the tractor to work for a living, then there would be no question in my mind but to go with sleeves and pistons, rods and mains. The comment below about micrometers and guages is spot on. Lots of good parts that are within working specs get thrown away every day. Unfortunately, I have been guilty of that as well.
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