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The 6hp is not the intended kicker I have for my boat. It is a motor that I have and was trying different hp motors for a comparison. A side note, the 6 hp is a short shaft, which I thought only a long shaft would work. Mind you, my boat sits a little lower than most outrages. I'm not sure what the norm is, but my splashwell has about 2-3" of water in it at a stand still.

As far as the prop for the 6 hp is concerned, I'm sure the prop you mentioned Irak, would make a big difference. I have a Yamaha 4 hp (1 cyl) that I plan on trying. It has a prop similar to the one on the 6 hp.

I don't plan on using either the 6 or 4 hp motor as my permenant motor, so I would not buy different props for them.