When I saw their performance some ten years ago I totally lost interest. The AP 09 seem to be at least 1500rpm below other regular .10 engines on a 7x4 prop...
Does the carb have any low end adjustment?
Here is a video from NoNofulton active on RCU (1/2A forum) at the time;
[youtube]http://www.youtube.com/watch?v=ceP0OTrcbZw[/youtube]