Bret, I seen bad plugs go bad after they warm up. On a few occasions I've seen valve seats get hammered into the head. When it warms up, the valve doesn't seat properly a few minutes after of run time. Check the valve clearance. Sometimes the valve clearance is only .005 inch. on some briggs with OVH. I've also seen ignition modules go bad after they warm up.
Then I've heard of and not seen Gremlins that you'll never find unless you're lucky.
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Today's Featured Article - Storing Your Tractor - by Staff. If your tractor is going to be stored for any length of time, a few precautionary measures are helpful in preserving various parts, also in avoiding future difficulty. Store tractor under cover. If impossible to place tractor under cover, be sure to cover air stack and exhaust pipe. Drain radiator and engine block. To avoid gum content collections, drain both fuel tanks and carburetor. Leave radiator and fuel caps slightly loose to protect gaskets. Block tractor up to remove weight from tires and to keep tires from contact with moist floor.
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