One of my riding buddies (ABV1) just got a WR too, so I can use both of you. I and do mean use..
[size=4]I've come to realize that the only WR I've ridden with YZ hotcams also had a 13.5:1 piston and mild porting, but with the stock header. (Kenshaw). [/size]
[size=4]So, that comparison to mine is pretty useless, and probably should have been ignored.[/size]
Dude, not even close. Exactly what are the differences? 12.5:1 piston = negligible (not 13). Same cams. We had the same jetting until you went all over the board to even back to stock while running a YZ header pipe.
If you would just put in the 172 main, 48 pilot JD Red needle which you say you have plenty of. Stock header pipe which I thought you had gotten, we would be the same. You keep failing to mention that carb bowl thingy. It doesn't matter how many times you have gotten them to work, your bike isn't working for you. I told you, make it like mine, I'll show up and we can compare. Worthless if you don't make it the same though.
The mild porting, talk to your engine builder and listen to him. It was just a clean up port to flow a bit more air. He can tell you the performance expectations. Use the vast knowledge base you have at your disposal.
Satan get behind me.
Post, post, post :-)