Reading more about this, specifically Indian Thunder Stroke related, and there is a rubber plug in the frame above the rear cylinder on S1 AC fitted bikes. There is an air "tunnel" from the front to the rear of the frame and this rubber plug blocks it.
Removing it will get more air to the rear cylinder while moving, and more air into the engine area in general. I'll be looking for this on mine - it may have changed on different MY versions over the years.Unbolting and lifting the rear of the tank and undoing the two mounting screws holding it into place is the easiest way to remove it.
Still, it won't solve the stationary heat soak issues.
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