Are you talking about generic scrap, or bike scrapyards?
There might be some light at the end of the tunnel, signed up with a 3 wheeler forum, and a little searching, found that the cam from an xr200 dirt bike will fit in my atc
![Arms](images/smilies/arms.gif)
and better yet, they are relatively cheap, and even better, looks like they make more power than stock
I found one:
http://www.ebay.com/itm/HONDA-XL-200...96b20c&vxp=mtr
Still looking for the pulse generator parts......