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Most motor cycles have non existant aerodynamics so anything you can do to get improved aero dynamic is a good start. There are three rules for good aerodynamic round in front 1 in 6 taper towards the rear and a continues surface. The standard motorcycle brakes all three rules. So the first thing to do is to make the surface continues. I have done scale model wind tunnel tests that indicate that a smooth block of foam with only a rounded front and all other edges square and double the frontal area of a 12;1 scale model of a Yamaha WR250, has aprox 35% less drag! so you can see that a continuos suface makes quit a deferance.
On a sport bike with a fairing, fill up the space between the rider and the wind screen with as big a tank bag as you can. Install long saddle bags as close behind the riders lower legs as posible and cover all holes that have no utility. after you have done that change the finall drive to reduce rpm.
A good book to read on this is The Racing Motorcycle by John Bradley, in which he points out that a bus has better aerodynamics than the average motocycle. That is only because it has a continouse surface, all the bus surfaces are flat with little rounding or tapering. Craig Vetter provids great information as well, you can look at his 1980 - 1985 fuel economy contest on his web sit. The two up contest is the most usefull for the standard motorcycle.
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