Thanks for the advice guys. :) Actually, it goes "BWOP BWOP BWOP" when I give her gas. lol
I'll be getting an airbox (if I can find one), and cleaning out the fuel valve (petcock?) today. I replaced the line (the old one was brown and I couldn't see through it), and now I see that it frequently runs without gas in that new line (I have to flick and squeeze it to get more gas to come out into the line), so I suspect there's a clog in that fuel valve.
I took the exhaust pipe apart yesterday, and a previous owner had already derestricted the pipe, so I'm good to go with that.
Before I even attempted to start it, I took apart the carb and cleaned it yesterday, but since the tank is probably fairly nasty, it's probably gunking up the carb again...ugh. Any tips on cleaning the tank and petcock?