I posted here about 2 weeks ago. I took the airbox of my newly bought 82 gs50g and found the boots melted and the slide in the carb stuck. I got the slide unstuck bought new boots started the bike and it idled at 4k. Started messing with idle knob now it won't start but will fire. I also noticed that the idle air mixture screw (I think that's what it's called) is missing. It looks like someone broke it off and maybe tried to solder something in there so it seems that it would be very hard to replace? I added a picture, the crudely drawn arrow points to the missing screw.

what should I do? Bought the bike for $750. It has a clean title. It seemed like a good deal since all the rubber bits are in good shape and it had a new stator. I like working on motorcycles but my skill level is more around doing my own maintenance and less complete overhaul. I get kinda bogged down when it comes to complex trouble shooting. Anyway what should I do?

what should I do? Bought the bike for $750. It has a clean title. It seemed like a good deal since all the rubber bits are in good shape and it had a new stator. I like working on motorcycles but my skill level is more around doing my own maintenance and less complete overhaul. I get kinda bogged down when it comes to complex trouble shooting. Anyway what should I do?