Hi All:
I have an os46ax given to me by a friend. Took it to the field today, in my plane,and started it up. Started just fine, tried to adjust the hsn, but it would make no difference. Tried the pinch test, through the whole needle range, held the plane nose up, wanted to die in that position in various settings. Have never flown this engine, it is not a new engine. Can anyone tell me why I can't get a change with my needle adjustment? It sounded like it had plenty of power and transitioned really well, but as soon as I held the planes nose up, it wanted to die, couldn't do the pinch test either, did not speed up when I did this either. Could there be a leak?

thanks for your input. I know there is someone out there who has a solution.
Norm