I know I have stated here a few times that I wanted to build this bike to be as close to an R version as possible. I wanted a lighter feeling and handling bike with scoot closer to a YZF but with the magic button and green sticker. But I have to say, I am not sure this bike really needs the YZ cams. I am fairly impressed with WR motor and for tight technical trail riding, I dont think the R cams are would be a benefit for this type of riding. The power delivery is next to perfect for my liking and for the type of riding I do. I will know better when I get to ride it in a more wide open area to compare. Which I may be doing some high desert riding this weekend.
I felt the same way. But since I was putting a new piston and cam chain in I thought I would try the YZ cams and 13.5-1 piston. With my 08 cams and HC piston this bike is even easier to ride in the tight woods. The power is unbelievably smooth and the bike is a traction monster. The power delivery just wants to hook up and not spin but it has more grunt and more on top. I find I have less engine braking too which I think is a good thing. But I've still got to sort out my estart with the yz cams, it's about 50/50. But I just did the rebuild this fall and put about 8hrs on it. I haven't played with the jetting yet. This spring.
Not saying it's something to do right now, but it's something to keep in mind for the future.
Here's my thread from my rebuild