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What is small copper tube on Mikuni 1/BST34?

2K views 1 reply 1 participant last post by  landingzone 
#1 ·
I am rebuilding my carb from my 2004 ATP 500HO. The owners manual says it is a 1/BST34. There is a small copper tube that runs from the casting directly behind behind the choke to near the float bowl. My tube is cracked (separated) at the choke end. What does this tube do? How could I fix it? What harm would come from leaving it cracked?
I also can't remove the diaphragm cover screws because they have no removal slots. Should I be concerned about this or not worry about it given the problem being addressed?
I can't find a diagram or manual for this exact model. For example, it has a plastic float assembly that I can't find referenced anywhere.
Any experience here would be appreciated.
 
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