The trick with an air cooled engine is getting air flow smoothly in and out of the fairing. A NACA inlet on either side of the dustbin ahead of the engine would work. The ideal exit point is near the rider's leg. If possible find a low pressure area behind the legs as the rear half of the fairing narrows. With the dustbin front you are looking at a long tail section to maintain aero stability. Consider an electric fan in front of the engine fins and a temperature gauge of some sort.
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