I've found that using a heli engine with the increased head area works great for pushers. My bobcat starts up, idles, and goes through the tuning process without heating up, sagging, or dying out. If possible, try switching the cylinder head to a heli head that matches your engine. Opjose, thanks for all your input on setting up the bobcat. I'll be flying it more often to get used to it, as I got only 1 flight in during the weekend. I still have problems when aileron banking the plane and applying elevator...the nose still pitches up. The plane is definitely not tail heavy, so I guess it could be the alignment of the booms? I've noticed that the tail booms curve inwards, and it may cause an elevator effect. Would splaying the rudders outward a few degrees solve this problem?