My advice is to buy a used lower unit pinion gear for a similar outboard. Many outboards have the same standard 14-point spline shaft at each end of the driveshaft. My 1980’s Tohatsu M25B shaft fit a 1960’s or so Johnson 20-30HP lower unit pinion gear. For $35 I bought a used pinion gear from the local marine repair yard, and with a $15 keyway coupler, I had a machinist grind one end of the pinion gear piece until it reached 7/8” diameter and slipped into the 7/8” keyway coupler----the rest of the job was to JBWeld the two together---has worked flawlessly for several years now. Didn’t bother to grind the pinion gear’s gear---it just spins away at the top of the driveshaft driving nothing.
In case this helps-
-Myles
From: electricboats@
Sent: Sunday, December 27, 2009 10:47 AM
To: electricboats@
Subject: [Electric Boats] Source for coupler (14 spline, 5/8ths shaft) to motor or pully
I am about to get seriously into converting an old outboard to electric. I've got all the parts laid out except one. Is there a commercial source for a coupler that would slide onto that 14 spline 5/8ths inch outboard that would be suitable for either direct drive to an outboard, or into a pulley. I'm trying to avoid the cutting and welding end of this if I can.
I've seen quite a few comments, but not one that specifically mentions a source.
Thanks
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