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The whole purpose of your streamlining is to decrease the load on the engine. Then you lower the final drive ratio to increase speed at any given RPM. The same amount of work done by the engine gives you a greater speed. Based on that it seems obvious to me you will have higher velocity air to cool the engine and aerodynamic bodywork to reduce the CD. While water cooled engiens may have a coolant stability advantage, air cooled engines have no cooling system other than fins. Many may consider this their only cooling but oil cooling also helps the air cooled engines and some have greater oil capacity to assist with oil cooling. Obviously the addition of a separate oil cooler would improve cooling.
I would monitor temps on any air cooled aero-bike and compare them to temps in stock configuration. You may be surprized at how cool thay can run, but one thing is certain. They do NOT suffer from overcooled liquid coolant entering the engine and sucking more heat from the cylinder walls.
regards
Mech
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