Have not done it on mine, but on a buddies that I ride with.
It is really easy to see if you need this by removing the sub-frame and watching the gas squirt into the carb. We did my buddies YZF right after I got the CR.
It made a HUGE difference in throttle response!
Let me know if ya want some help doing it. I have the tap and all the tools.
The kid wants to race at Oak Hill on Sunday, so that is where we will be.
Cool track great soil. I fractured what is called the "Radial Head". It is not nearly as bad as actually breaking the arm. I see the doc Friday, and hopefully he will get me out of this cast, as it's a real bummer having a new bike and going to the races and only being able to watch!
C-ya soon