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This is the new frame for the YCS1, CS3, and RD200. It is a copy of the Yetman YL1 using slightly larger tubing. My son has ridden it and it handles and steers great. The only problem he noticed was a tendency for the front end to chatter on rough pavement. The front tire is showing no wear so lower pressure should increase grip and might stop the chatter. I'm using reworked and shortened Red Wing 34mm forks which are heavier than the forks we were using and I don't use a steering damper. The rear dampers are some old ones that I've lengthened a bit.
SA pivot and rear motor mount
Top tubes are 3/4" The down tube is 1-1/4"	Bulkhead is 3/4" and 5/8"
Almost finished. Just needs 2 more tubes, shock mounts and a few tabs for seat and tank
The last 2 tubes are in	Finished frame
Swing arm in the jig.
Almost finished, just needs anchor point for brake stay and chain adjuster tabs.
Finished frame with SA and footpeg plates which help brace the outer ends of the SA pivot. The SA doesn't use a through bolt. I use 1/2" Allen screws that thread into the frame from each side with a SS bushing that the SA pivots on. I use Delrin bushings and hone them in line after they are pressed in.
The frame weighs about 20 pounds with the SA which is about 8 pounds lighter than the stock frame & SA. That doesn't sound like much but it's about a 4% reduction in the total weight of the bike.