volvit
XS400 New Member
Hello all. We'll I finally unloaded another project and now I have a chance to get my 81 XS400. I've been chasing a flooding issue and determined the needle in the bowl was traveling to far even though the float levels were within spec. Long story short, float post broken, need new carb. I picked up a set from a 77 xs400 off ebay, chancy I know, but they arrived and I couldn't be happier with the condition. I tore them down and the only thing I found to need immediate attention is one side/diaphragm. I figured I could swap parts needed from my original 81 carbs. Not quite, the slides on the 81 are 29mm while the 77's are 28mm. From my reading, I was under the assumption that all these BS34 carbs are the same, just jetted differently. Am I missing something here? If this is true, is one set better than the other? Thanks.