Well, I added a velocity stack, and it didn't solve my problem, but it did make it easier to recognize. The carb is having the fuel sucked out by the airflow over the carb. It is like I have three adjustments, hi and lo needle, and airflow. It's like balancing on the head of a pin trying to adjust it, then when in the air it all goes to heck. I can't control the airflow well enough to get a consistent run. I tried the stack rotated every which way. You could put your hand in front of the carb and it would richen up noticeably.

Do you guys think a L shaped stack made from a copper elbow faced away from the prop would work? How about some fairly open cell foam over the velocity stack.

Thanks for your help and any experience you might offer.

fwman1