Congrats on the 125. As others have said don't worry about rebuilding the engine until its a necessity, alot of old kohlers smoke a bit but they'll still run forever with no problem. I would change all the fluids and filter, make sure you use a real cub filter and cub hytrans in the rear end, since its summer youll want to run sae30 oil in the engine. I run 89 octanne with 10% ethanal with no problem, I was recommended 89 by a local cub guy to stop back firing when I shut the tractor off annd it works.
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