Well the spring on my 1980 NC50 Express finally broke. I wanted to avoid the kick start conversion, but the expense of a new L cover is more than I want to spend.
I found an old thread on doing the conversion. The nice thing is this did not involve any tapping, just a trip to Ace hardware.
Here is a picture of the starter drive sprocket with the washers inserted. The washers replace the spring removing the ratcheting feature of the sprocket. I used some lock washers and squeezed them flat. Lock washers seem to be the only thing I can find with the proper inner and outer diameter. I did use two different ones to fill the space.
Here is a pic of the L cover with the main spring removed. I had to drill out the centers of the button head bolts holding the plate down. I still ended up cutting the side off the nuts with a dremel and was able to remove them with some channel lock pliers.
I replaced the safety torx head bolts with some regular button head bolts. I also used a little blue loctite when I put them back in.
Here are all the pieces in place and ready to be joined to the rest of the crankcase.
Lastly here is the finished product. I took advantage of the fact that I had the L cover off and gave it a few coats of white paint to pretty it up a bit.
Using the original arm with the footpeg removed, it works good although I am using may hand to spin it. I am looking for something, perhaps from a different bike, to use as a proper kickstart.