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  1. bigdev

    Yamaha engine mixture

    Hello all new to the forum.. Question ? I have a 1983 Yamaha 25hp 2 stroke, I have read on other forums that you need to change the oil mixture as the engine gets older ? So i use 100/1 mixture at the moment do i have to change to 50/1 mixture..as the engine is so old. thank for any help BD
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