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1978 XS400 carb rebuild help

Discussion in 'The Garage' started by 4gent5mith, Jul 11, 2018.

  1. 4gent5mith

    4gent5mith XS400 New Member

    Hello all! I'm new here but have been lurking the forums for awhile now. This is my first build I'm doing on my own. It's a 1978 XS400 that has been chopped and welded to be a monoshock (it's pretty badass if I do say so myself). The photo of the bike is old and doesn't really look like that anymore but at least you can see what I'm dealing with.

    But anyway, I'm currently rebuilding the BS34 carbs and I'm curious as to what you guys would recommend for my jetting. I know there are several threads on this already but really couldn't find my answer.

    Both on the slides are stuck, the previous owner took a screwdriver to it and destroyed the top on the needle jet. So I'm replacing both with the jets with the 336-Y0 from mikesXS. They say it runs richer than the stock needle jets do. I'm also running K&N style pod filters and the exhaust is custom that's nearly open. The main jet is 142.5 currently and I'm just wondering if the main jet size is ok or will it run too rich?

    The carbs are currently in an ultrasonic cleaner so I'll post the rest of the jet sizes when I get them back.

    Thanks, Adam.

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