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buying a new carb and there are 2 of the exact same one that fits my bike but one is 15mm and one is 19mm, what do i measure to find out which one i need?
 

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Here is a picture of the real deal Dellorto SHA 14/14 carburetor, this one is setup for a cable choke but the stock carb uses the lever type choke, the blata replica bikes use the china copy of the SHA 14/14.



Here is a picture of the intake manifold, the metal tube sticking out is the part that would fit inside the carburetor, this is what would be measured to determine which carburetor would fit.




There is one other option for the later gen bikes, so if your intake manifold looks different and your carburetor looks different you should look at the PHBG 19mm by Dellorto, again the replica bikes will come stock with the china copy of the PHBG 19mm.
 
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