I am still having trouble getting my low speed needle set.
On my previous post the engine would kill or go to a lower than usual rpm when the throttle was reduced quickly. The remedy for this was to richen up the low end.
Now I can't seem to get the sweet spot. It seems as if it either quits or has inconsistent idle speed due to a lean low speed needle setting, or it sputters and hesitates when the throttle is advanced to full after flying at about a medium throttle setting which would be too rich of a low needle setting. When it is leaned too much, it also becomes hard to start. There is about 1/8 turn difference between these two conditions.
I am running 91 octane non-oxygenated gasoline with Pennzoil at 32:1 ratio. I am using a Vess 22A prop. I am using an NGK CM-6 plug. The timing is between 28°- 29°. The vent from the carburetor is vented to the interior of the plane. I now am about 1/2 way through my 3rd gallon of fuel.

Jody...JoeAirPort...Would the velocity stack you mentioned earlier in this post help with the rich mid range problem? I don't see this item on the Valley View web site.

Greg