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  1. F

    converting 9.9 into a 15 hp

    Looking at the Yamaha parts online I was wondering if it is possible to convert my ft 9.9 four stroke into a 15 hp? Are the only differences in the carb?
  2. F

    1986 9.9hp ft water in lower end

    I have an '86 9.9ft with some water mixed in the lower gear case. Is the water a concern while operating? What are the possible leak sources? Thanks for any assist.
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