Okay now for the powerplant discussion. I am thinking of using the Saito 125 4-stroke. Since I am saving my pennies I will need to buy the Saito engine mount so that I can build the fuse without having the engine. Not sure how long I can build around adding the F2 fuselage bulkhead and installing the blind nuts (which is why I want to get the engine mount instead of using the included adjustable engine mount).

To save money I couldgo with thetwo stroke O.S. 120 AX (I have two .46 AX and love them both).

So whichengine will perform best mounted upside down?
Are there any tricks to cranking and priming an inverted engine?

I guess thata starter will be anecessity instead of the chicken stick thatI usefor the 4Star and my Profile.