I like OEM parts in terms of 'hard parts', but a quality American made aftermarket part works just as well from my experience. Stens seems to be pretty decent- however- some ebay parts are cheap generic import stuff that's subpar to the quality we've come to expect from our K-series engines. As they say "buyer be-aware".
If you want, I'd dump 1/4 can of '4 cylinder size' ReStore in it. You can buy it most any parts store, near all of the miracle oil treatments and such. Be sure to store it upside down and to shake it for a couple of minutes before use so the ingredients are well mixed.
There was a 4h project where a kid used it on an old Briggs (measured out for 'one cylinder'), and it did increase compression slightly. It sounds worn enough that this may not help though.
-Matt
p.s. It seems that the corner of your hood would be black with soot from the style of muffler you have on there. Did you clean it for the pics? My 129 (pretty much same as your tractor) has an elbow, a cylindrical muffler, and a short tailpipe exiting the 'passenger' side of the tractor.
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CC 128 (Sept. 74)... and other vintage non-CC LT/GTs.
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