ORIGINAL: JohnBuckner
It is an acquired technique that does require some sound interpretation but is not only very accurate but can be accomplished in seconds easily.
...........just done simply by running the engine up WOT letting it stabilize and pinch the tank line just for a fraction of a second almost as quickly as you can do it.
Thank you for your post, John.
Before today, I have used the pinch only for adjusting low end.
Thanks to your post, I tried the pinch for high end this evening at the field.
I believe that I improved the performance of my 0.40 engine that way.
However, I had to pinch the line a little longer than what you have explained, in order to hear the small increment in rpm's.
My needle valve is not remote.