K321
I fixed it! It was a valve issue, but not a stuck valve. I removed the head, carb, and valve cover. Turning the engine, I could see the valves moving freely. However, I gave each of them a few squirts of PB Blaster down into the valve guides for good measure.
Next I checked the valve tappet clearances with the piston at TDC on the compression stroke. For some reason, the exhaust valve was out of spec. The gap was too small. I reset it to .018; the intake valve was okay at .009.
I put it all back together and she fired up and ran strong. I let it run for 20 minutes at low idle. I will re-torque the head bolts in the morning.
I believe it is repaired. Any other advice?
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Tractor #1--1972 Model 149 with rear lift
Tractor #2--1972 Model 149 with rear lift
1A tiller w/both extensions, 38" & 42" Mower Decks, Wheel Weights, Ohio Steel Fabricators 10" mold board plow, two 42" snow blades, QA-42A Snow Thrower, Brinly Sleeve Hitch
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