ORIGINAL: jjcollett
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?
Both of my DL-50 had the same problem. The way I found to tune that works on the DL's, is to set the needles to factory. Warm up the engine and lean the low end until it hesitates when you quickly advance the throttle. Richen up the low end a little. With a tach, lean the high to when it just gets to the highest rpm. Fly the plane and you'll probably notice that it burbles on the low / mid rpm and misses sometimes on the high. Land the plane and turn the high end needle only in a 1/8 turn. (If you try to use the low end needle at this time to tune out the low end burble, it does not work.) Fly the plane again, keep leaning the high needle until both the low end burble and high end miss goes away. When you get it right, the motor will really rip. Check your head temp after each adjustment to make sure you don't over lean the high end.