I am learning to use my DL50 on a Nosen Giant Stick. I can't seem to reduce the low and mid range burble no matter how much I lean out the low end. Seems to run best at slightly over 1 turn out on low. At 1 turn low it quit at mid throttle right after take off. High is adjusted slightly below peak rpm. Transitions well, just burbles a lot. Seems to me I have the needles very lean although the plug does not indicate that.

I am using the stock stand off and the firewall is flat.

Now I am wondering if I may be starving the carb for air. Anyone had experience with this issue?