Bob I think you need to have that cylinder bored and fit with new piston plus crank checked/ground. Lots of scoring on that piston top to bottom. You can throw it back together with some new Parts but realize it’s a crap shoot and may or may not last. All these old k series have egg shaped bores in them and if it didn’t smoke before it may very well smoke upon reassembly with just new rings. The famous line on here though is that it’s your cub and your money so do as you wish. Btw I think I have a used cam also.
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(2) Original, 100, 102, 124, 73, 800, #1 and #2 cart, brinly plows, disk, IH184, IH244, 1948 F Cub
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