I converted my 25HP Tohatsu outboard to electric just over 20 years ago.

Since, I have been running with an original Briggs and Stratton Etek motor.

The mount is fairly simple with a thin quarter or three eights inch thick aluminum plate on which is mounted 3 thick aluminum uprights maybe 2inch high each and on top of that a half inch aluminum plate that the motor is mounted to. ?The motor direct drives the spline shaft and there are no additional bearings.

Initially I cast my own spline to 7 eighths inch diam. Shaft couplers by casting the spline part with JB weld…those would last 2 or 3 months before shredding… Later I learned that outboard driveshafts typically have identical splines on top and bottom.? And so, for 35 dollars I picked up a used lower unit spline bevel gear, then bringing that and a 7 eights diameter shaft coupler to a machinist I had the machinist grind down the gear to 7 eighths inch diam at one end, then inserted and epoxied the result into the 7 eights diam. Coupler.? Result has been solid for nearly 20 years and cost just 100 dollars total including the machining.? I was looking at at least 500 dollars to get a spline coupler machined, so this was a bargain.

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See pics at

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Myles

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