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Old 18 June 2014, 17:07   #1
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Country: UK - England
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Suzuki 9.9hp upgrade

I've got a 12 month old 4 stroke Suzuki 9.9hp short shaft outboard, my question is can it be increased in power say to 15hp without taking out a second mortgage.
If so how.
Phil
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Old 19 June 2014, 12:12   #2
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If it's that new you might end up needing to replace the ECU, in which case you'd probably be cheaper trading in for a bigger engine. There's an argument that says if it's that new that argument wil stand regardless of what needs changed.


First thing to do is grab the sales brochure. look at the spec sheets at the back - if the 9.9 is the same bore & stroke a something with more HP and siomilar weight / bore /stroke then you stand half a chance.

If, however, it's the "big HP" engine of a batch of two or three smaller ones then forget it....unless you just want to do it for the challenge.
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Old 19 June 2014, 12:22   #3
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Check the carb is opening to full throttle. Some motors have a restrictor on the throttle to limit hp. Also check for air restrictors in the inlet.
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