Hi, I have set my engine up on the ground fine but the performance in the air is allot different.

When I tip the nose up (on the ground) the RPM increases but holds. When I put the nose level again, the RPM drops and she runs a little rich (which I can live with). If I lean up the main needle to get max RPM then hold the nose she cuts indicating too lean. This issue with the main needle isn't so bad, it is still OK as flat put RPM isn't a problem.

However with the slow running idle, I've adjusted it so that the transition is pretty quick when on the ground, but when I get it airborne there is a 3 second delay, a bit of a splutter and then she goes flat out.

Any of you guys got any ideas??. The engine is ringed, 2 needle carb. 40 size running on a 10x4 prop.