RE: Fox 60 no fuel
Just a quick blurb about initial settings for the Mark X carb from an old Dukes Mixture column. For the 60 through 78 carb, the initial low speed needle setting is to turn the needle out from the friction clip, turn it in till it just engages the clip, then turn in another 2 turns. For the high speed, back the high speed needle out of the clip, turn in to the point of engagement, then turn in another 5 turns.
There was a version of the Fox carb just before the current MK X, a twin needle design, where the proper setting procedure was to set the high side slightly rich, throttle down, adjust the low speed needle and idle, THEN set the high speed, just the opposite of anybody else's carb. Drove a lot of engine people nuts, trying to get decent runs out of these engines, Even P. G. F. Chinn made a comment about this carb in his MAN column.
At one point, Fox 60s were very high compression to operate on low or no nitro fuels during a period of nitro shortage. A couple different engine columnists have remarked on various Fox .60s ability to turn larger props. I believe RC Reports rated the Fox Eagle 3 turning 1.20 sized props at RPMs equal to the high end 4 strokes.
I've also found because of the course needle valve thread, sometimes it's a good idea to slip small lengths of fuel line over the needles to kind of form a gasket to cut down on air leakage. This hasn't been unique to Fox.