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The needles will work in the 400 ( they are close to the 77-79 xs400 5Z-1 needles) but the 336-yo jet will not. I tried them in them in my 80 and could not get them to tune right for the 400. They are metered for a 650 that runs a much less rpm.
you still got your set ? i just wanna give it a try and considering how ppl are always saying bikes are differnt and worse case scenerio i install them on my 650 carbs
Nope. I sold them with my xs650 two years ago. I would use a set of 77-79 5Z-1 needles in your 400 as they are adjustable and (richer) than the 80-82 sets.