To follow up on this problem (in case 50 years from now someone is restoring one of these), my friend took it to a dealer, and the problem was, as a couple of you suggested, the high pressure fuel filter. The dealer changed both filters, and briefly told him how to find and change the high pressure filter. A couple big parts have to come off, including the long intake manifold that stretched across the starboard side of the powerhead before you can even see the part. He was told that filters are about the only problem they ever see with that model.
They charged him for 3/4 hour of labor.
Thanks again for all the suggestions – I probably could have fixed it last week on our fishing trip if I had metric tools along, but then maybe I’d have dropped parts in the lake, and it’s hard enough sometimes to find parts dropped on my workshop floor!…..and I would have been learning on someone else’s nearly new motor.
Dave
