Spyder - I spoke to the guy who designed the Kuryakyn heat shields for Harleys. He told me - showed me - how air is FORCED onto the rear jug by the Kuryakyn shield. So their shield adds more air flow to rear fins, according to the guy who designed it. Suppose the same applies to the Harley shields.
Sure.....when the bikes moving thru the air, but, I'm talking about when the rear jug gets so hot .... in traffic, stopped at lights, esp. thru towns, stop and go, etc...that's when the shields just hold the air around the motor instead of allowing it to rise up away from the rear jug and onto the riders legs....more comfort for the rider at the expense of the motor. I wonder if that's what the new 'floating seat' that's suppose to be 'cooler' is.....something to block the heat from rising away from the motor? Got to see one to figure what their doing.

har! spyder