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  1. J

    1991 Yamaha 150

    "I have a 1991 yamaha 150 outb "I have a 1991 yamaha 150 outboard (V6). The motor was running well but then all of a sudden it would not go to full power. Normally the engine could turn 5200 RPM but now it will only get to 4300-4400 (depending on trim). I checked and replaced all spark plugs...
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