Brothers, I'm 6'-1" and weigh every bit of 275 lbs and the old GeeZer handles it without fanfare. Remember that the bike can carry 425 lbs total.
Hell, in the Asian subcontinent market, they put mamasan, papasan, (2) kiddysans, and a cage full of chickensans on it and go to market. The GeeZer is third world transportation at it's finest.
And on top of that, they put a low octane head on it that will run saki, kerosene, deisel, dog piss, and etc. In the Asian subcontinent market they may make 10 hp tops.
If it can handle that, it can handle your ass as well. It may look like you need another one for your other butt cheek, but.............