6.5 greyhound carb adjust broke off + no run

#1
So I dug out my Db 30 + 196cc that I hadn't ridden in a year or so, but it had sat out in the weather that whole time. I cleaned the carb as best I could, and put it back together. I could get it to run for a few seconds but it would putter out. Figured just need to adjust the carb, so I found this little black clip, popped it off and tried to adjust the screw. But when I did it snapped off (I think). There is no way of adjusting that now, and no way of getting the screw head back on. It ran awesome when I parked it awhile ago, so maybe I just need to clean it better, or even a carb upgrade :D so basically I need to figure out if I will be fine with a broken carb adjust, and what I need to do to get this little SOB outing a smile on my face again. here are some pictures of what happened and where it broke from.
- Album on Imgur
sorry I'm on mobile right now, and this was the only way I could figure out how to post pics.

Thanks for your help.
 
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