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  1. L

    Anyone heard of a 5GZ15 needle for the BS34?

    My canadian 1980 XS400 special has a 271 y-4 needle jet, and an adjustable 5gz15 needle. I am trying to set up the jetting for my pod filters and am ordering 45 and 47.5 pilots, and 137.5, 140 and 142.5 mains. I would like to order the right needle and needle jet, but I can't figure out which...
  2. L

    Strange carb jetting in new bike

    Hello again, I finally got a 1980 XS400SE. It has the third version of the BS34 carbs. I am trying to get the carbs as close to stock as possible as a baseline to begin jetting properly. I can't find any other info about the needle my carbs have, and was wondering if anyone can give me clues on...
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