Re: Hooooooray I found the air leak!
Yeah, unscrew the carb top and stick the o-ring up in there. You'll need a little screwdriver or something to seat it. Screw the top back on a little snug and you're done.
The rings from SBP come in a three pack. One for the carb to intake, one for the carb top, and one for a spare. Well worth it, better than sealer goop for sure. And they're made from Viton, so they're fuel compatible.