Exactly the symptoms that I was getting. When I would throttle back on downwind and turning to base, I would get that rough running.
This adjustment fixed the issue.
Exactly the symptoms that I was getting. When I would throttle back on downwind and turning to base, I would get that rough running.
This adjustment fixed the issue.
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?
Last edited by SkySteve; 01-23-2011 at 05:52 PM.
Steve Wilson
Huntsville, UT
Kitfox 85DD
912A / 3 Blade Taper Tip Warp Drive
Convertible Nosewheel & Tailwheel
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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...
Rotax 912, Bing 64... Jet Needle Clip position 3 is normal.. 3rd from the top of the needle, 1 up from the bottom towards the tip. Lowering the clip on the needle raises the needle and riches the mixture.
My plane came from 5000' MSL to sea level. Ran just like your problems. Lowered clips to raise needle from 2 to 3, rebalanced carbs, smiles all around.