Re: 1956 Oliver 5.5 hp won’t start

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October 8, 2016 at 3:55 am #45422
Mumbles
Participant

    Backfiring into the crankcase is usually a sign of scored cylinders, pistons and rings. The fire is getting past the pistons and igniting the fuel charge in the crankcase. It might be time to do some surgery on her.