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  1. #1
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    New Mercury 75hp to 90hp?

    I have the new style 75hp Mercury four stroke on my bass boat. I've been reading the only difference between the 75 and 90 is a restriction plate in the intake? So theoretically I could remove the plate and not have any issues? I'm concerned it may throw off the air ratio for the EFi? Also not sure what the 90hp max rpm is vs the 75hp? I'd appreciate any advice on this subject. Thanks!

  2. #2
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    Computer is different also. Off the top head the 75 is 5500 max and the 90/115 non pro-xs is 6000.

  3. #3
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    Ok that was my concern, I was wondering if the ecu would be mapped differently for the 90hp compared to the 75hp. It would make sense they changed it rather than just throwing a restrictor ring in and calling it good. Thanks.

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