Hi guys,

Here is my problem with my GF45i. I have had the engine for a few months now, and had it running fine, then about 2 weeks ago, I apparently set it to lean and dead stick in a very bad spot. I tore the Landing gear and the firewall of my Edge and had some building to do. Now the plane is on its feet again, and I ran the engine again this Weekend.
It started right up, Idle was fine, but as soon as I opened the throttle the engine would surge at high revs and run rich. As I close the high end this goes away, and the engine revs up very nicely. Now my low end is a bit lean, so I open the low end then the surging is back. I then close the high end again, and it seams to become a lot better, to the point where it is gone. But as soon as the plane leaves the ground its back, it surges only at full throttle. The plane has no Cowl on it, so I thought that it would be ram air. I put a velocity stack on the engine, but no change. The problem seams to be that I can not close the low end far enough to get it run lean enough in the top end, If I close the top end then there is no transition, and the engine wants to die if I open the throttle.

Here are my thoughts: If I hold my hand in front of the Carb at full throttle, preventing ram air to enter the Carb, the engine goes rich! to the point where it looses a lot of power.

Do I have to put a Cowl on to fly????
Is my prop to small? (18X10 MAS, only balanced prop I had there at the time, giving steady 8200RPM at WOT)
Is my fuel mixture wrong 32/1 Klotz 310 and 95 octane unleaded?
Do I have to run a line from the diaphragm hole to the inside of the plane? (the diaphragm is pointing backwards on this engine, so!! no ram air on it????)

What are your thoughts?