Even for my own personaly knowledge im trying to picture where this gasket is located inside the carb. If its only 1 year old its not a 6.5HP, B&S does not use HP ratings on something with a direct coupling like a pressure washer, it would have a series (i.e. 650 Series = 6.50 gross ft/lbs tq per SAE J1940). Im trying to understand what this guy is describing and what model of engine in particular. This is the only pressure washer i see that fits your general description, is this the correct one?
http://www.farmandfleet.com/products...re_washer.html
Now i just looked up the 675 series engine on that model and pulled up a carb exploded view with kit, which refference number was the offending part?
http://i264.photobucket.com/albums/i...r/carbdiag.jpg