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Can you get me the serial number of the engine?
Put the control in reverse. Put the lower unit in reverse. The reverse lock cam will push up on the shaft from the reverse lock. This causes the hooks further up on the midsection to go over and lock down on the tilt pin. So in reverse you want the high point of the cam forward. Does this make sense to you?
Glad to help. Love the old motors. Please don't forget to rate my service.