I installed lower fairings on my FLH over the winter and have been riding with them on up until yesterday. It's bouncing close to 100F here in Atlanta, so needless to say, it's been a little warm. Over the past few weeks I've been doing some tuning, building maps, etc and of course I like to always keep track of cylinder head temperatures. I found what I expected on the front, just below 300 deg at the spark plug...perfect. Then I checked the rear...375F! Yikes...that's a bit too hot for my taste. I of course played with fuel mixtures and timing and nothing seemed to make a sizeable difference until I took the lowers off (with are "vented"). I was expecting it to lower temps a little but not 70F lower! Just an FYI.... Happy Motoring!