I have two TN-27s that the splines in the crankshaft are rusty and are striped.
Ahhh, it’s the crankshaft which is boogered. OK.
Here’s a JW which had the splines stripped in both the crank and on the shaft. To ‘fix’ it, I silver brazed a socket to the crank and cut and shaped the top of the driveshaft to fit. The three horse JW doesn’t develop a whole lot of torque so it should last for a while.
I picked up a four horse last year with a Macgyver fix for stripped splines in the crank so I’ll see if I can’t find some photos of it. The way it was done might be the easiest way for your TN.
Here’s the JW three horse.
