So with more research, I thought some needles/leaves had collected in engine bay and burned to cause a melted hole in the airbox. I rotated the cover and tried running the machine again (since the hole is pre-filter), and it melted again in the same radial location (about at 2 o-clock when looking at the airbox. Does anyone have an idea of what may cause this? I ordered a new airbox but do not want another melted airbox in a week.... I'm a bit lost!? Chris