Quote Originally Posted by SkySteve View Post
I have have the same issue and so does John, my hangar parnter (model IV speedster). Sometimes we have wondered if our engines will quit on final. I have noticed it more on days with high humidity, like just before and just after a snow storm. Low humidity days do not seem to affect it. Do you think an adjustment back to the original needle position is going to be required or desired in warmer dryer weather?
Can't hurt to try, Steve. It turned out to be very easy to do. Unhook the enrichener spring and remove the two phillips screws on the top of the carb, remove the slide piston, remove the regular screw in the top of the piston to change the needle position, reassemble. There was no reason to unhook the cables, so no carb syncing needed.

Easy, peasy...