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air/fuel screws

  1. 2009 Yamaha 25hp 2 cylinder 2-stroke running lean and burning plugs on top cylinder, help appreciate

    General Discussion
    Motor starts on first crank, runs like the day it was new. Had a friend use it and cleaned the carbs, has 2 carburetors, model is 25ESH. Well, as long as im cruising at low speeds it runs and idles great but when i go full throttle it may go for 2 minutes or 10 minutes but will eventually lose...