XS400 carb main jets

[Philip Gour]

Finally got the BS34 carbs cleaned up, ultrasound cleaned and all of the parts, but have a question about the main jets. The main jets in the manual indicate that they are different sizes (right to left). The rebuild kits that I have ordered have completely different size numbers. Can anyone give a little insight into the correct mains to use. I will be installing filter pods as the kids who had the bike previously trashed the air box.
Thanks

 

[CaptChrome]

I'd go with the stock size jets for starters and use only jets that are either from Mikuni or some other well known provider (like Jets R Us). After you try those out, you can then try going up a size on the mains and pilots incrementally to test whether they work better. Jets are pretty cheap, so it isn't a big money sink, just a time sink.