Hi portabelly, welcome here.
That pulley you are showing I assume is the pulley up under the seat where the drive belt changes the direction of the drive. Bit hard to see what pulley there but it should be a "V" pulley, flat idler pulleys run on the back side of the belt. I doubt this is the cause of your belt slipping and burning because the belts are designed to twist and flex in those short distances.
