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Old 18 June 2014, 12:07   #1
esoxuk's Avatar
Country: UK - England
Town: South Yorkshire
Make: Avon
Length: 3m +
Engine: 15hp Mercury 4st
Join Date: May 2014
Posts: 43
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.

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Old 19 June 2014, 07:12   #2
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,614
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, 07:22   #3
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
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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