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Re: motorcycle engine inboard

Interesting project...but remember, the spinning prop pushes on the shaft which pushes on a thrust bearing (usually in the gearbox). You can't just hook the shaft to the side of the motorcycle motor...I don't know of any motorcycle motors that are designed to accept thrust from the exterior. You'll need a separate gearbox or simply at thrust bearing mounting in fron of a shoulder on the prop shaft, to take the thrust and drive the boat. Naturally, that gearbox or thrust bearing block will have to be very well secured to the stiff structure of the boat.

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