Based on everything I have seen to this point, at 48 oz w/ muffler this might be the lightest of them all. I guess BME is in that class also. The only problem with ZDZ is where they put that stupid carb. It really gets into the way. RCS problem is they don't have an engine in that 40cc range other than the twin, and I don't want to shell out that kind of money for it.