If it has stuck valves, take the valve cover off, look for the stuck ones, that will be open and not moving.
Spray some penetrating oil between the spring coils onto the stem, above the guide, let it soak if possible.
Then try lightly tapping down on the spring retainer, sometimes that will shock it loose.
If that doesn't work, try prying between the spring coils to force it closed. Then try prying it open to free it. Just be careful not to bend the stem or release the keepers.
Also check for bent pushrods.
And do give each cylinder a squirt of oil to lube the rings.
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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.
... [Read Article]
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