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Ninja EX500 carbs on an XS650?

Discussion in 'The Garage' started by Highside, Oct 20, 2011.

  1. Highside

    Highside Lord of the Flies

    Without looking into this, I was thinking that this might be a good idea.

    Has anyone tried this, or am I just high on low-grade crack cocaine (again)??
  2. jamesgs4

    jamesgs4 fuck this, let's ride!

    why not? 500 is pretty close to 650, so minor jetting is all that I could think of.
  3. jayel

    jayel #9 Guru 74 TX650A

    not much point in it still a CV carb
    Team Junk likes this.
  4. Highside

    Highside Lord of the Flies

    Yes, but is has to be better than the CV38's I've got now. :shrug:
  5. jedi_

    jedi_ xs650 cafe racer

    do they use the same measurements for air filter and intake manifold?
  6. jamesgs4

    jamesgs4 fuck this, let's ride!

    as an upgrade over the 38's? prob lose some performance with the smaller carbs.
    Team Junk likes this.
  7. Highside

    Highside Lord of the Flies

    The Ninja makes 60 HP with 'em with no prob. :shrug:
  8. jamesgs4

    jamesgs4 fuck this, let's ride!

    60 hp? wow. learn something new every day
  9. jamesgs4

    jamesgs4 fuck this, let's ride!

    Aren't the 38's supposed to be the best stock xs carbs? I have the 80's bs 34s, and they are supposed to suck worse.
    edit: mine work great.
    Last edited: Oct 21, 2011
  10. weekendrider

    weekendrider Iron Horse cowboy Top Contributor

    S.W. MO
    Is it a flat slided carb? Would the slide be lighter/quicker?
  11. Ghetto

    Ghetto Bob it!

    There is nothing wrong with 34's. So easy to get them running good even a caveman can do it.
  12. jay760

    jay760 XS650 Junkie

    GPZ 500 carbs are supposed to fit straight on, heard of this done quite a few times.
  13. grizld1

    grizld1 Grumpy old man Top Contributor

    XS650 intake distance is 120 mm. center-to-center, and I know of no bike carbs, twin or 4-banger, with spacing that's compatible; fabrication required. Modern flat slide vacuum carbs like those fitted to the EX500 twin would do much to quicken throttle response on the XS650 and would likely flow better as well, but in addition to fabrication you'd need to know how to tune. Don't expect massive power gains from a change of carbies.
  14. Darkdruid

    Darkdruid XS650 Member

    I have heard this as well and spoken to an owner who had done it with minimal fuss.
  15. Tz250racer

    Tz250racer XS650 Addict

    Make 50 hp on the wheel.Most magazines got that figure on the dyno.Definately way faster then the Xs.I am lucky enough to have both track ready.Yes the kehins do fit but the carb spigot groove is off.Carbs on the Ex are much lighter.I got TM34 flats on the Xs and I never I the need to go with the Ex carbs.
  16. so has anybody done an artical on fitting tm 34 mikuni on xs650s
  17. XS1961

    XS1961 XS addict!

    Ive had ER500 (more or less same as GPZ500)carbs on an XS,straight fit onto the XS rubbers..Had to f*** about with the jetting & slide but way better than the stock XS CV's.
    peanut likes this.
  18. Highside

    Highside Lord of the Flies


    I thought i made this thread.

    I got a set off of ebay for cheap and I'm going to try them out.

    First thing I notice is that they weigh half what the stock CV 38's do.

    I'll save 3 lbs just by switching to these carbs.
  19. Wizard of Smiles

    Wizard of Smiles Retro Rookie Rider

    Did you get any where w/ these?
  20. 56nomad

    56nomad XS650 Enthusiast

    Have you made any progress, Highside? Really ready for an update on this. :)

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