One word of caution...I wouldn't fly it with the muffler line disconnected. You will more than likely have a dead-stick and the engine will not run properly at different orientations because the engine cannot draw enough fuel without the muffler pressure.
That being said, experiment away!
Thanks,
Jimmy
ORIGINAL: FlatSpin
ORIGINAL: rhd-RCU
By taking off the line you leaned out the engine. Not getting as much fuel.
That was my first impression too. But w/the muffler pressure line attached, I tweaked the HS needle for about 150-200 RPM less than peak. I guess I convinced myself that a sustained 900 RPM difference wasn't it, especially since the change in RPMs was almost instantaneous. (Not like pinching the line and seeing a gradual RPM increase.) I'll experiment with leaning it out a little more to see if that is what it was. I learn something new every day. THANKS!
Dave