My muffler rusted off or got really hot but it fell off not much was holding it on. I'm trying to find a part number to buy a replacement. All the parts diagrams show everything but the muffler. the model of the motor is 313707 0126-E1. It is round held on by 2 bolts with the tailpipe coming out of the bottom and bending outward all I can find are screw ons.