I have never felt engine heat is a problem with the B. In hot weather which we have a lot of here in the Southwest I ride with a a cool vest under my jacket. A cool vest works best when worn under a jacket to keep the wind from drying it out. I usually re wet the vest every 2 1/2 to 3 hours. I also wear a Mission Endura cool neck wrap. It is surprising how much it helps to have the endura cool around your neck. I also am very careful to stay hydrated.
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