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  1. #16
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    Mar 2006
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    Do the finger ports help to get the intake air in motion, or is it to get anouther place to pull more fuel in?

  2. #17
    Join Date
    May 2003
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    SOUTH OF BOSTON
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    pulls more air fuel mix,

  3. #18
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    Mar 2006
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    Thanks everyone!

    Are wisco pistons the way to go?

  4. #19
    Join Date
    Aug 2019
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    Ft myers
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    I have a 70 Yamaha 2 stroke , I put 90 carbs , hydrotec head , 155 main jets , I still have 2.33 gears , what are my options to run taller gears ? Thanks for any input

  5. #20
    Join Date
    Jun 2007
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    Yes, I heard the 2.0:1 gears from the 90hp will fit in the 70hp case. Not 100% sure though.
    Also, there are the small lowers like the one that came with the 70CES and some other Yamaha motors.

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