There is no comparison whatsoever in my opinion. The heat coming off the rear cylinder of the Harleys is a ball fryer. I do not even notice any heat off my F6 and I regularly wear shorts riding in south TEXAS. I know some will frown on that but after 50 years of riding, most of that as a Police Officer, believe me clothes shred off you fast in an accident. Wearing boots, Gloves and a Helmet are what really count. The pic below I was wearing gloves and still got my hand shredded.Attachment 7307Attachment 7308Attachment 7309