I have been running the Webra for two seasons now. You need to run fuel with a 16 to 18% oil content, besides what the others have stated in this thread. Omega may have a higher oil content? Running Synthetic is also better. You will get a carbon buildup in the engine with Omega. Been there, done that when I ran the OS 61 Hanno Special years ago with Omega. The best two fuels that myself and others have found are 15% Cool Power and Powermaster 15/16(16% oil). I use Powermaster specially ordered without the dye in it. Also, you need to put afterrun oil in religiously after every flying session if you want any kind of bearing life. I use Mobil 1. Unfortunately, I have not found any source for Stainless Steel bearings for this motor. The motor runs its best around 8000 RPM. Try an APC 16.5X12W(Central Hobbies carries these the last time I checked). Great down lines and you'll fly at a slower more comfortable pace. Other props to consider are the APC 16X13, APC 15.5X12.5W. You may also want to get the air filter carried by Jeff Carrish. They are for the OS, but also fit the Webra Carb, as well. The link is: http://eaton9999.com/pattern-craft.com/

Joe Lachowski
NSRCA 330
AMA102303