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Rivets and Tiger: I agree 100%. The engine runs good and I don't need to tear it down for naught. As an old friend and great mechanic says, "If it ain't broke, don't fix it". I appreciate all the feedback and input. Meanwhile, I'll be fixing the rear tire that went flat while snowblowing this...

Compression was done dry. Six or seven cranks with electric starter (until reading reached max). Engine does not smoke or use an excessive amount of oil. About what I would expect from a 39 year old engine that has been used year round for mowing and snowblowing (500 ft driveway in central New...

Thanks slomo. I will check valve clearance. Easier than a big teardown. I do keep the cooling fins and block clean. And, my 45 year old Craftsman compression tester seems to works pretty well on everything: 1974 Sportster, '69 Charger (440 CI) and all small engines ;). Appreciate the feedback.

I have a 16 HP I/C engine in my Simplicity 5216H. Bought new in 1986. Engine model 402707 0145 01. The engine is getting a bit tired and I'd like to re-ring it. Compression is 90 lbs in both cylinders, factory cross hatching is still visible on the cylinder walls. The engine runs fine, just down...