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    Yamaha carb jet sizes question

    So I am fixing to have the head shaved on my 75hp yamaha 3 cyl 2 stroke.

    I looked at stock main etting on boats.net.
    C75hp jets #175
    C85hp jets #165
    C90hp jets #160

    So why are the main jets...
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    87 yamaha 40hp can swap?

    Looking at up sizing my carbs and tuner on my 87 yamaha 40hp. I know 1994 and older motors throttle goes one direction and 1995 and newer go a different direction. Do i just need to make sure I get...
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