Re: 1970-ish Yamaha Mariner 8 runs erratic. Can you tell me why?

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September 22, 2016 at 11:11 pm #44557
beerman57
Participant

    fuel pump diaphram, still OK at low speed but can’t handle the increased volume of high speed. Years ago I had a friends similar motor the same way, after I did the fuel pump it ran like a raped ape.