I'm using a 22X10 Pro-Zinger prop on this engine. It has a smooth transition from idle to full throttle (runs smooth at full throttle). When in idle, on the ground, it idles very rough. Is this normal for a BME 50? I have this engine on a GP P.Wagstaff extra 300 and when in idle, the whole plane really shakes. The wings and horizontal stab are just fluttering away like mad. I think this just plays havoc on the servos. Idle RPM is 1300 to 1500 and when increased by 200 RPM it will smoothen out but then I'm idling at 1500 to 1700 RPM. I may be wrong but I would think an idle speed of 1700 or 1800 RPM is too fast. Has anyone out there experienced the same problem? I welcome any comments and suggestions. Thanks.