A lot will depend on the bike you choose and how it's outfitted. My 66cc china girl added about 25 lbs to the bike. Overall, according to the shipping scale at work my beast
weighs in at 84 lbs (with a half-tank of gas and toolkit).
pedal it, but I rarely do for any distance. The extra weight isn't bad when pedalling, but is noticable pushing it up the bridge with a rear flat.