I have (am using ) silicone on a S. tiger .45 with a similar results no problems I did run several tanks through it before I mounted it on the plane. I have used liquid steel as well (I think of it as hi-temp epoxy, with a metal filler) on a four-stroke as well. only on fractures and nicks though I would recommend drilling and tapping a screw or two on either side of the carb (like the O.S.'s or K & B's) to hold the carb inplace. If you have a pinch type bolt holding the carb down.

Complements on the knight with the one liner, reminded me of that particular .45, went inverted with a trainer and went up instead of down.. left about a 6-7 inch hole in the ground!