Mounting the engine up high creates way too many problems, if mounted high I could mount a gas tank under the engine and its well protected but the weight of the consumed fuel will never lower the center of gravity if I mount the fuel tank as high or even above the engine as I consume fuel the center of gravity is lowered.

 

With a tank under the engine the tank is trapped by the heat of the exhaust and the heat of the engine I am pretty sure Honda didnt locate the engine under the engine for a reason.

You can see the finished engine mount here

The engine up high would solve the carb clearance problems but still does not cure the air box problem.

I mounted one 39mm PWK carb you can see with the engine high it will clear the trans.

 

Fan cooled in the wifes