1. Having trouble logging in? Try closing your browser and re-opening it. If that doesn't work, try a different browser or device. The site will be updated soon to resolve these browser issues.
    Dismiss Notice
  2. Dismiss Notice
  3. Want an XS400.com t-shirt? Go to the store to order. Limited sizes and quantities available.
    Dismiss Notice

My petcock threw up—!

Discussion in 'The Garage' started by Vermont4me, May 13, 2023.

  1. Vermont4me

    Vermont4me XS400 Member

    Hello my friend- I’m in ‘carb hell’…so the first set of carbs had a hole in the float, sent them back..second set I snagged ($150) is absolutely frozen, I mean frozen- so I may have to send that one back too- what would you do if you were me (again, not super mechanically inclined…)- someone has a listing for 100% rebuilt and blasted etc carbs for $399 I think it is- I’m so frustrated maybe I should have done this at the get go- needing help in Hartford! Lol
  2. Vermont4me

    Vermont4me XS400 Member

    Last question- with a capped vacuum hose on my 81xs- will gas flow naturally if it’s not running? Maybe that’s why gas kept pouring out of the carbs as I’m standing there- oh if I only knew…
  3. tstidham

    tstidham XS400 Addict

    Not if the float, needle and seat are functioning properly inside the carbs. Whether you have a mechanical or vacuum petcock, there will always be fuel in the fuel line from the petcock to the carb.
    Vermont4me likes this.
  4. CaptChrome

    CaptChrome XS400 Addict Top Contributor

    Maybe a little late, but....

    I did find a source for new Mikuni floats (genuine Mikuni too!). That is Sudco International in California. I don't know the pricing, but here is the relevant info on them:
    Brass float is Sudco part # 002-114
    Plastic float is Sudco part # 007-727

    They look to be a veritable one-stop-shop for everything Mikuni.
    Vermont4me and tstidham like this.
  5. Vermont4me

    Vermont4me XS400 Member

  6. Vermont4me

    Vermont4me XS400 Member

    thanks guys- I had a sick kind of realization this am (maybe)- so I’ll pose my thought in a question…

    I capped the vacuum line on the engine but DIDNT cap it in the carbs- would this be why gas would continue to pour out if the carbs? I’m thinking I answered my own question….please let me know your thoughts!
  7. tstidham

    tstidham XS400 Addict

    If they are factory carbs, there isn't anything to cap. Only the two vacuum ports on the carb holders. If fuel is leaking, either the float level is wrong, the needle or seat is worn or the float is sinking due to holes. When I rebuilt my carbs, I had a leak only while on the side stand out of the left carb. I found my seat was worn and ordered two new ones from mikesxs.
  8. Vermont4me

    Vermont4me XS400 Member

    Definitely the holes then- thx and appreciate you

Share This Page