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I have a Yamaha XS750 1979 rebuilt as a cafe racer (not by me). I need to buy some parts for the carb, but cant seem to find out what carb I have - no ID number anywhere. I think the original is called BS34 but not sure.

Can anyone help me please ?

enter image description here

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Not sure about the model number, but the parts diagram for the original looks like what your photos show.

enter image description here

http://www.partzilla.com/parts/search/Yamaha/Motorcycle/1979/XS750F/CARBURETOR/parts.html

  • thanks a lot - so I´ll go with the BS34 original and will try to find the parts I need. – bongobrown Mar 13 '17 at 21:03
  • @bongobrown - It should be noted each carb (left, right, center) has is a different carburetor (each has it's own part number and description). – Pᴀᴜʟsᴛᴇʀ2 Mar 13 '17 at 22:12
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I believe they are a BS38 Constant Velocity (CV) Mikuni Carb. Look at the center pair of images, which are a dual setup, but appears to be the same. According to this they were used from 1976-1979, which fits your description.

enter image description here

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