You point also in another direction. It could be an ignition problem causing rough running which as you said causes fuel spillage and the smell. But then it should keep running rough..........
But why does the engine run smooth after waiting a while? Is then the overfill in the bowl been consumed?
Could be the ignition. Usually though, an ignition problem doesn't go away. You can usually spot that by just looking at the plugs. Don't check the plugs if the engine has been idling for a while, They will be black after a long idle period. Best way to check them is to make a short flight then check the plugs. The ceramic portion should be a light tan to white color. One dark plug would indicate an ignition problem. Many dark or black plugs on the same side would usually indicate a carb problem.
Could be a combination of things. I'd check the carbs first. If you don't find anything there, then try the plugs. Sometimes cleaning and regapping the plugs will do the trick.
I still tend to think its fuel related. Possibly choke settings, dirty carb galleries, float valve and floats, etc..
I agree it should be fuel related. Therefore I looked at the choke settings. They were both equal at the carbs but not anymore: so no carb synch at idle! Reason still to be found.
This must result in a bad engine starting with the possible consequence that fuel is spilled and thereby enriching the engine and prolonged bad running. After a while with the engine still warm the flooding is over and the engine starts normal.
This morning I adjusted the carb synch at idle. Normal behavior. Uneventful flight. Still have to confirm this!
Possible lessons learned: not only synch at 3600 rpm but also at idle (check settings regularly) and just off idle at 2200 rpm.
Jan
Hope to fly tomorrow and see how is behaves. Will report.
We should always sync at idle and the higher rpms. The chokes can get hung up at times, but not from the choke itself, but usually the cable that attacks to them gets some friction within the sheath and prevents one from returning to the closed position.
Roger Lee LSRM-A & Rotax Instructor & Rotax IRC Tucson, AZ Ryan Airfield (KRYN) 520-349-7056 Cell
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