" This applies to any OHV engine regardless of horse power, number of cylinders, make or model ."
I have found at least one exception to the rule. Honda CRV engines at least the 1999 & 2000 years. These have solid lifters on an overhead cam and in time the valves will actually tighten up from valve wear recession into the head and then burn a valve. Honda won't even recognize the problem and tell you to have them adjusted more often.
I have not messed with many of the OHV small engines to know how they behave. I have adjusted the valves on some small diesels and they are as you described loose from wear. Seemed like the first time (500hrs) you find adjustment needed but then on they seemed ok.
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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