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 - Massey Ferguson 35 (and up) Tractor Assembly Notes - by Jack Wetmore. These assembly notes are for Massey Ferguson tractors with a two stage clutch and 6 speed, 8 speed and mutli-power transmissions. I see a lot of discussion forum messages regarding damaged clutches from improper assembly. The objective is to have the engine and transmission slide together safely and easily until the gap between the two halves is less than 1/4", BEFORE tightening any of the bolts holding the two together. Using bolts to draw the two halves together will damage the PTO
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