I just bought a XT140. I liked the features, but after 20 minutes of weed eating a ditch I got my arm down on the metal case and it was hot enough to make me jump. I never have had this happen with the Stihl, Echo, or Kawasaki that I have run. They have plastic cases. It did not blister me, but I jerked every time I got my arm anywhere on the case. Is this normal? My dealer has a 30 day money back guarantee. I thought about taking it back and going back to a Stihl, but I am not sure about the 4 mix engines. Any advice or help would be appreciated. Surely I am not the first to have this problem.