It may have been done a few times over, but I am going to ask again. Has anyone ever tried any different type engine swaps into the F2 or F3 or F4 chassis? I have seen the F2 with the older 900rr engine swaps in which I soon to have my hands on one, but was curious to see if anyone else has tried something else with these older 600s.

 

I think the F4i is a direct bolt on for the F4

 

Also wondering the same thing.