I ordered a gear off Ebay that fit my motor output shaft and had enough extra material to work with for drilling or welding. I had previously cut the center hub out of the clutch disk to have a matching spline for the transmission shaft.The task at hand is to adapt the motor to the transmission spline.
I found a scrap 1.5 inch piece of round stock that I machined in the lathe for a snug fit of the gear and the inside of the splined core so the 2 parts would be in alignment for
welding or bolting together. I will need a roughly a 3/8 spacer between the 2 parts due to the construction of the clutch center.I found that I needed at least 1/2 inch spacer between the transmission spline and motor shaft, I found in the scrap pile a
old coupler that was 1 inch and would work.
After machining and drilling the sprocket, I snapped a tap off and
had to redrill the holes as removing the tap proved to be too difficult, after assembly it was far from running true.I was out getting some allen head cap bolts for the adapter and found a hub for a weld on sprocket, it looked to be large enough for making the adapter so I picked it up, I found that the spacer and my new motor hub outside diameter were the same making alignment easier. I fastened the two together with a hose clamp to mark and drill the holes.
I redrilled the holes, broke another tap, and put it all together with my alignment shaft. I spun it in the lathe and it ran true, success!
I put what seemed like too much time in the adapter but it is an important part and I wanted it to be right, I only used four bolts and have looked up the shear and strength numbers, with no clutch and absence of shock loads I am confident it will hold up ok. Time will tell...





