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    Efi computer chip to increase hp

    I am new to boat motors, especially yamaha's, but as on my harley's, the efi chips are great. I looked on the internet and found a chip for efi motors, i have a 1999 yamaha 225 vmax . Just purchased about a month ago. Also, i was told that the 200, 225, 250 share the same engine block, 3.1...
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    1990 Propeller For 60hp mercury

    I currently use a 10 5/8" x12 prop on a 16 foot aluminum bass boat. I am running aobut 40mph. Can I increase my speed by installing a higher pitch prop and if so, could you suggest one. The boat is a Spectrum 17 ....Thanks for your suggestions. John
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    1991 Merc 60HP, steady horn, even after water runs good

    I have had a steady horn blow since I came back from fishing in brackish water.I flushed the engine the next day when I got home. I assume that maybe some sand or salt fouled up the cooling system. I took a water hose and back washed the line from the exit line, and the water just began to shoot...
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