Please help ID this carb

nujee

XS400 Enthusiast
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Bought my 1981 Yamaha XS400 and came with this carb. Looks too big and will not fit the intake rubber boot. I'm guessing this is from another bike. What is this carb and will this work on my bike? Thanks in advance.

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That's what I thought too. I want to run single carb set up but worried about the leaning issue of one of the cylinders. Probably just going to watch out for a used XS400 carb and sell this one.
 
Yes those are the BS38's from an XS650. I have a kz750 twin with bs38's and they are the same as the xs650 except for jetting and a few other minor details
 
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