1. Dismiss Notice
  2. Hey Facebook people... We've created a group for XS650.com members to connect. Check it out!
    Dismiss Notice

Jet kits

Discussion in 'The Garage' started by Oprahands, Dec 5, 2019.

  1. Oprahands

    Oprahands XS650 Member

    Ive been trying to find a jet kit for my bar I carbs so i could try a bunch of different jets to get my bike running right. Its very rich at the moment and i dont want to pay 10 bucks for every single jet id like to test
     
  2. grizld1

    grizld1 Grumpy old man Top Contributor

    Welcome! You'll find many posts on this, but most kits are generic and contain bits and pieces that don't work for the application listed. You can usually trust only the float bowl gasket and float valve assembly, and sometimes the float valve seat is hinky. Avoid Keyster, lots of Chiwanese junk in those kits. Individual bits of genuine Mikuni parts look like they'll cost more, but at the end of the day you'll save time and money with them. Click the Tech button and find the link to the XS650 USA carb guide; year-by-year carb identification and components are there, and you'll be able to identify the parts you need. My favorite source for Mikuni brass is Niche Cycle Supply.
     
    gggGary likes this.
  3. Oprahands

    Oprahands XS650 Member

  4. gggGary

    gggGary Stop that! XS650.com Supporter Top Contributor

    :agree:

    :thumbsup:Niche cycle and genuine mikuni. :thumbsup:

    bar I carbs????
     
  5. Oprahands

    Oprahands XS650 Member

    Sorry i think i tried to type bikes carbs but my thumbs don like working sometimes. Theyre mikuni bs38's
     
    gggGary likes this.
  6. 5twins

    5twins XS650 Guru Top Contributor

    18,873
    9,711
    688
    You'll need to narrow down the carb set I.D. better than that. There were 4 different sets of BS38s used on the 650 during it's production and they were all jetted differently. You base your re-jetting on what was stock for the year of the carb set, not the year of the bike .....

    [​IMG]
     
    gggGary likes this.
  7. Oprahands

    Oprahands XS650 Member

    Thanks 5twins! The chart helps a lot. Been reading your stuff on here for a while now actually and it helps.
     
  8. 5twins

    5twins XS650 Guru Top Contributor

    18,873
    9,711
    688
    For the usual "pods and pipes" mods many of us do, some minor re-jetting may be required. But we're talking just some small size increases, like one up on the pilots and one or two up on the mains. The exception is the '76-'77 carb set with it's very small 122.5 main. The one size increase for the pilot will hold true but for the main you may need to go 3 or 4 up instead of just 1 or 2.
     
    gggGary likes this.
  9. Oprahands

    Oprahands XS650 Member

    The to g is though is its running really rich with stock jets and pod filters
     
  10. gggGary

    gggGary Stop that! XS650.com Supporter Top Contributor

  11. gggGary

    gggGary Stop that! XS650.com Supporter Top Contributor

    How does it run with the filters off?
     
  12. gggGary

    gggGary Stop that! XS650.com Supporter Top Contributor

  13. Goldenboy

    Goldenboy . XS650.com Supporter Top Contributor

    Attached Files:

    gggGary likes this.
  14. gggGary

    gggGary Stop that! XS650.com Supporter Top Contributor

    Wow I never would have guessed.
     
    Goldenboy likes this.
  15. zodc

    zodc XS650 Enthusiast

    Is that the same for BS34s or are these basically the same through the years?
     
  16. zodc

    zodc XS650 Enthusiast

    Nevermind... I just realized you posted the specs in my carb thread and BS34 is at the bottom. :)
     
    gggGary likes this.
  17. 5twins

    5twins XS650 Guru Top Contributor

    18,873
    9,711
    688
    The BS34s were changed a little bit compared to the BS38s but they remain very similar. Jetting changes required for mods remain pretty much the same as well. On my '83, I have pods and quite open mufflers. I'm one up on the pilots, two up on the mains, and one down on the air jet. The air jet is another tuning "tool" for the idle circuit.

    [​IMG]

    [​IMG]

    [​IMG]
     
    zodc and gggGary like this.

Share This Page