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Idle air mixture screw missing?

mrhedges

mrhedges

Forum Mentor
Past Site Supporter
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.

carbs.jpg

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?
 
yea I have looked at that site a bunch The problem is I don't think I can get it out theirs solder stuck in the hole. Should I just buy another set of Carbs off ebay?
 
Ok after reading some more I think I should do a compression test on all 4 cylinders that's a good next step right?
 
You should definitely get new carbs if you can't correct the problems with the existing. If the bike has not been running for some time I think you would be better off getting the carbs done and the valves adjusted before bothering with compression checks. Also be aware that compression will likely be low in a bike that hasn't been ridden in a while and will recover some as the rings and valves settle in.
 
Pull the carbs- maybe the solder is barely hanging on in there and will come out easily. I can't tell from your pic why this was done, unless someone crudely sealed it off. There is a method to cut into those mixture screw "towers" to extract the mixture screw, but I can't find the link now. See how your other carbs look before you decide to get new/ used ebay set.
 
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