I bench ran it many years ago to see if I wanted to use it on a Goldberg Ultimate biplane or not. But the Ultimate had the weirdest problem that I was never able to solve. the engine would always quit if you did a roll too fast. Loops, inverted, knife edge, slow rolls, four points, tail slides, spins, etc all worked no problem. it was fast rolls that would kill the engine. i tried a different fuel tank, and different engines. i eventually tired of it real quick and sold it to someone else. Anyway if you flew it and avoid the rolls you were OK.
weird huh? I ran a Fox 60 eagle III, a Fox Eagle IV 74, a OS 1.20 four stroke and it did the same thing with all of the engines.
Anyway, I ought to put the K&B 65 on something one of these days.

I have four K&B 20 Sportster engines and they all have Perry Carbs on them. I was going to run them on Royal B-17 but the plane got crushed when i was moving.