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Is it worth it?

also any recommendations for carb parts and parts in general? because I'm not sure if I should trust Ebay for parts

The high idle is because of an air leak. Must likely from the rubber carb boots attached to the head.

There are some links that will help you...

https://gsarchive.bwringer.com/mtsac/~cliff/storage/gs/Mikuni_BS-CV_Carburetor_Rebuild_Tutorial.pdf

https://www.thegsresources.com/_for...2-mikuni-bs-cv-and-vm-o-ring-kits#post1703182

http://www.thegsresources.com/_forum/showthread.php?t=171846
 
In my experience a high warmed up idle is also a common symptom of someone turning the throttle stop way up to help a bike with clogged pilot jets start and run when cold (to get a quick sale of an old bike that has sat, or simply out of ignorance). Have seen it numerous times.
 
Let's keep something else in mind here guys. If the people who worked on this bike before couldn't keep it running after going through the carbs it probably means nobody was able to properly set the idle speed screw. Sure, a leaky intake is the likely culprit but there's other things to consider before looking at that part of the problem
 
Definitely not the 'mechanics' who previously worked on it. They are not qualified to work on old bikes.
 
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