Bull, I've been looking at that same CMP Zero, only I'd get mine from Alex at ak-models.com. He's out of stock on them right now, but I was thinking the Brillelli 26ss would be a nice fit. My buddy has a CMP Corsair of the same scale, and he's putting an OS 160 on his. I've been telling him to go gas and the Brillelli 26, but he's resisted.

I don't know the difference myself, but I'd guess the 160 would have more power, but weight wise both motors look to be the same w/ muffler, and the 160 says it needs a 450-550cc tank and I'm sure the gas would be MUCH less. I'm wondering if the trade in fluid weight might make the overal power to weight about the same.