[john hall]

Kind of with Alvy on this one, better take a look and see if its insulated with grease and grass clippings. Just wondering if its running too lean, timing off (don't know how that could happen), or any kind of heat shield is missing. You say its sudden, maybe its the last fuel you bought. How about draining the tank and getting a gallon of freshly purchased fuel--myself, I'd get name brand not Bubbas quickie mart.