Love, love, love this stretch of Hwy 49, which is also known as the "little Dragon". I also first encountered this stretch south of Mariposa coming home from Yosemite years ago. At that time I had a Vulcan 1600 Classic cruiser which did little justice to this road; dragging metal, fighting the weight through the sweepers, not being able to find a suitable gear to drive out of the turns, etc. By the time I got to Coulterville, I was exhausted and dripping with sweat.
The curves are smooth, banked perfectly, and not too sharp, which lures you to drive fast!
This road inspired me to buy my Versys, which was made for roads like these!
Here's a pretty good video.