However once I reached certain altitude the engine started to fail and at some stage refused to run with the throttle open. It would only run at part throttle. At the same time, I lost the temp gauge. I thought that the ground cable had become loose.
On the way down, yes, the temp gauge came back to life and, of course, engine response was recovered.
I was so surprised on the effect of altitude on jetting, I could not believe it. Now I know what "running rich" is.
This is a std, wire spliced MC21. Max altitude was 1,500 m and I was 200 km away from sea level. Air temperature could be +/-20ºC
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