Hey blownalcohol...so from what I'm getting from you , the 220 should work with the CG adjustments made correctly? I know that there are a couple of guys around my club that are running the OS 160's very sucessfully. I know one of the recommended engine choices is the Saito 180 and from my research the engine itself is about the same in size but the weight is about 8 ounces difference??? What do you think? [8D]