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Project Bought a ZXR250C.

Discussion in 'Your 250cc Projects' started by Linkin, Jan 30, 2017.

  1. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    That’s a bonus.
    I would never go to the RMS centers unless I had to.
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  2. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    So I've just ridden the ZXR for the first time since re-doing the tune and I simply can't describe how well it runs. It's like a brand new bike. It idles, the choke works, no problems... just perfect carburetion!

    I'm itching to have it back on the dyno now, just to see what the difference in numbers, both power output and AFR, is.
     
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  3. ShaneP

    ShaneP Well-Known Member

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    What did you do to retune it? I've got tuning issues, too.... And leaky floats (needle sticks before seating).
     
  4. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Just reset all the pilot screws to 2.5 turns + 1/8 turn out and balanced the throttles. But, instead of balancing to #1 carb, I balanced to #4 where the throttle linkage is.
     
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  5. ShaneP

    ShaneP Well-Known Member

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    How do you do balancing? Sometimes I borrow a mates digital 4 signal gauge (makes life so much easier, and you can balance at different throttle positions, so it is balanced when you're just poking along).
     
  6. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Digital vacuum balance gauge at work, there are videos in the thread.

    Throttle balance should be done at idle, then give it a big rev and let it settle before making any further adjustments. Then creep the throttle to check the balance. All we care about is that all butterflies rise and fall together.

    There is also a temperature range it should be done in, so it's a good idea to have a fan running over the motor/radiator.

    I've got the adjustable needles in the mail today from @sharky , I will dyno the bike as is and see how it is before fitting the adjustable ones.
     
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  7. ShaneP

    ShaneP Well-Known Member

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    I was just confused by your #1/#4 comment. Some use 2 vacuum lines and they can balance them wrong.
     
  8. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    I normally balance 1&2 and 3&4 and then balance the 2 pairs with the centre adjuster.
     
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  9. kiffsta

    kiffsta Senior Member

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    That is how I was taught to do it
     
  10. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Me too ... and that #2 is the 'base' carb
     
  11. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Depends on the bike... I would have thought that the master is the carb with the throttle plate/cables attatched
     
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  12. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Is this with the cracked head?
     
  13. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    What does it say in the recently translated Service Manual? :)
     
  14. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    I agree, it makes sense to do driven first and driving last that way you are not chasing the idle setting.
     
  15. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Yes it is. So far, the advice given to me to just use it as is has not resulted in any problems.

    The C model service manual says adjust to #1 carb, but doesn't say which one that is.

    And it seems to have worked, I have a complete lack of hesitation when creeping the throttle and nothing at 3,000rpm where it used to hang either going up in the revs or down.

     
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    Last edited: Nov 16, 2018
  16. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Well, this adventure has ended. Sold the bike today. Not happy to see it go, but at least it will get some good use.
     
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  17. ShaneP

    ShaneP Well-Known Member

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    An emotional time. And now to buy a brand new bike! Seriously, give it some proper consideration; I've seen the time and money you've put into secondhand bikes, and you have the R6 when you upgrade your licence, but your back didn't like the zxr, and won't like the R6, either.

    Off the top of my head, I don't think you'll get LAMS bike that's within bull's roar of the zxr; most are merely commuters. Maybe the FZ6R? Inline 4, but can't recall the frame/suspension. Or MT-07? Wait, triumph speed triple!
     
  18. 18000orbust

    18000orbust Active Member

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    FZ6 are great but no longer available brand new. Great bikes but. Easy to derestrict if you get a LAMs one.
    Give the Ninja 400 a go, more upright than a ZXR. Any number of naked bikes also. It's a buyer's market.


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  19. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Surely theres a suitable half decent trade in at work that u can pay off ?
     
  20. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    I'll be looking on Monday
     
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