Leak Down Test
Just my 2 cents, if you have a flywheel side main seal air leak, you will have a lean condition and seizure. The air leak could vary in volume and you could have a brown plug reading at a certain throttle opening then an immediate lean condition based on leak volume and throttle opening. Your mechanic should have replaced that leaking flywheel side main seal, then performed a new leak down test on the engine.
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2011 GG EC 300E, 1994 CR 250R, 1984 RM 250 E, 2022 Ranger 300
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