Just came back from the field after flying my Sig Kougar. The kougar has an evo .46 in it and the plane flies well with this engine.
Anyhoo, during the 2nd flight had throttled back to get lined up for landing. Problem is, the stupid thing was going way too fast to land so I just flew around til it ran out of fuel. No matter what I did decreasing the trim on the throttle, the plane kept going at a good clip.
I thought maybe the linkage or servo boned up. After deadsticking, I notice the "hole" in the barrel in the carb was about 1/3 to 1/4 closed even though the radio's throttle was all the way closed. Hmmm...WTS is goin on here!!!! Disconnected the throttle linkage completely and tried to move the throttle arm on the engine to close it all the way. It would not close by hand. So, I'm thinkin something is whacked on this carb. NE1 here of this problem? The throttle should close completely by hand but its left open about 1/3.

Dave...

There is an adjusting screw on the top of the carburetor on the throttle lever side. It has a jamb nut at its base. This screw if tightened too much will prevent the carb from closing all the way.

W8ye, I will have to take a look at that screw. When I first bought this evo, I had some problems at first. From the factory, the low needle was completely closed. Stinkin thing wouldn't start. I took off all the adjustment limiters to be able to freely move both needles as much as I wanted. It ran okay for awhile. Then I switched fuels over to Cool Power 15%. Engine ran better. I still however get a lag going to full throttle. The rpm's will increase as you move the throttle up. Once your at full, the engine is full bore.
Then, after about 7 seconds, the rpms increase even a few hundred more. I will say that the evo runs good for its price and it moves the kougar across the sky a good clip.

Dave...

Okay, checked the screw. It didn't have any effect. Called Horizon about the engine. They are sending me a new carb for the .46 NT.
I'd say that was mighty cool!!!

Dave...