I have a problem with my new Irvine 72 which has been run-in properly. The problem is that when I start the engine it sinks initially as the throttle is moved from low to high but after warm up runs good at full throttle. But the throttle response is not good. From Idle to full throttle the engine sinks and tries to quit as someone squeeze the throat and it becomes difficult to inhail...

If its the needle low/high please guid me how can I adjust it. Other than this problem the engine runs very good very powerful. I am using 12X6 apc prop. Starting is also very good. Also I had a crash landing because of this problem as the engine quits during a loop (vertical).