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  1. 06-12-2019, 04:03 AM #1
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    bullet123
    bullet123 is offline 5000 RPM
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    Inline 6 Question

    I have a 1978 90hp mercury and a 1978 115hp mercury. What is the difference? Just carbs?
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  2. 06-12-2019, 06:15 AM #2
    Dave S
    Dave S is offline Screaming And Flying!
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    I think the ports in the 90 are real small.......the 115s are small but the 90s........They run smooth.
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  4. 06-12-2019, 09:59 AM #3
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    half fast
    half fast is offline 6000 RPM
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    I don't think the 90 has power port pistons and cyl porting to match . hf ...
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