Reply To: 1953 Big Twin Fires on Two but Runs on One Cylinder Only

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October 27, 2020 at 11:55 am #219422
Mumbles
Participant

    Oil under the mag plate is usually a sign of the upper crank seal leaking. The O ring inside the carbon is probably dried out and brittle allowing fuel mix out and air in. The joint between the two crankcase halves could be leaking to.