Nizpro 633 V2

Nizpro Marine has developed the worlds most powerful outboard.
You start with Yamaha’s brilliant, and dare we say venerable 4.2l V6. You add a custom plenum (hence the red alien), separate, additional raw water cooling, and Eaton’s R1900 supercharger on top. Yet the really brilliant effort is in the re-map of the factory brain.
Now the 633RR adds a bigger pulley, new injectors, forged pistons, new valve springs, ported heads, and billet conrods, then some other more incidental bits too like throttle body and injectors, as well as a new drive leg. All very cool stuff, and the reason the whole thing is as bullet proof as the standard 300hp from Yamaha.
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