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  1. S

    yamaha 70beto wont go above 4200rpm underload

    i have a yamaha 70beto that is on a 24ft pontoon it is the original motor that came on it. It idles fine runs up to 5500 rpm on muffs in gear but in the water it wont go above 4200rpm. it all started last year when there was water in the one tank have done: new plugs new...
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