This is my stock, un-restored YA6. Runs great. 

This is how my YA6 trail bike looked after I decided to turn it into a roadracer. I bought it for $73 in the early 70's and it already had a GYT kit. I made the pipe and tank and it vibrated so bad I couldn't keep my feet on the pegs. The front brake is from a CB92 Honda. It's magnesium and useless.

The next year I made the new frame and for some reason it hardly vibrates at all. Maybe it had something to do with that sheet metal frame.

This was my next bright idea. I couldn't put a carb larger than 26mm on the rotary valve so I modified the case to fit the 22mm carb and reed valve from an RD200. It worked well so I put a CT2 26mm carb and valve on it. Now I need to get it jetted right, which so far has cost me a lot of pistons.