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Matt's CBR250RR(N) 1993

Discussion in 'Your 250cc Projects' started by MCiN7, Jun 4, 2015.

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  1. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    Yeah the diagrams I was looking at displayed something different.
    And I'd also argue that if the pilot jets have nothing to do with full throttle then balancing the carbs would have no affect at full throttle "effectiveness" is a very loose term.
    I stand by that stock pilot screws settings would be what I would do first in your situation Matt.
     
    Damus, Jul 19, 2015
    #61
  2. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Post up the diagrams

    When u balance a set of carbs it means synchronizing them .... in other words all the butterflys in each carb move at the same time

    Tuning the carbs at the pilot screws is done , as we keep trying to tell people , 1 carb at a time , starting with the stock X turns out as a starting point.
     
    GreyImport, Jul 19, 2015
    #62
  3. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    image.jpg
     
    Damus, Jul 19, 2015
    #63
  4. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Jul 19, 2015
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  5. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    Hey I'm no engineer. So maybe I have been mislead. But even still find it hard to believe that the pilot screw do "nothing" at full throttle.
     
    Damus, Jul 19, 2015
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  6. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    If your going to believe everything u read on the interwebs at least read the stuff that looks like it comes from someone with practical real time experience


    #1- The Pilot Circuit (also called the primary, low speed or idle circuit) consists of a brass fuel jet,
    called the pilot jet (in the float bowl), the pilot mixture screw (PMS), and the pilot air-correction jet (in the
    perimeter of the carb’s “mouth”). The Pilot circuit delivers its air/fuel mixture through a small hole in the carb’s
    “throat”, just downstream of where the throttle plate’s lower edge almost touches the carb bore. The pilot circuit
    regulates the fuel mixture at idle and small throttle openings, typically under one-quarter throttle. The pilot air
    correction jet (the small brass piece in a recess to the left of a bigger hole at the bottom of the carb “mouth” in
    the photo above) admits air to the pilot system, through a channel cast into the carb body, above the pilot jet,
    and it serves as a fuel/air ratio modifier and emulsion improver. This system can only deliver fuel to the engine
    by utilizing a strong intake vacuum to “suck” the fuel from up the float bowl.


    http://2fiftycc.com/index.php?resources/principles-of-motorcycle-carburetor-function.117/
     
    GreyImport, Jul 19, 2015
    #66
  7. MCiN7

    MCiN7 Well-Known Member

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    Thanks for that info Blair!

    Here's some more photos of the MC22, enjoy! Note that one side is completely polished, (left side, seen in photos), haven't touched the right side yet. Left side will need to be hit again when I do the right side.

    0F9A0484-3.jpg
    0F9A0478-2.jpg
    0F9A0520-4.jpg
     
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    MCiN7, Jul 19, 2015
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  8. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Bike looks great as always .....but mate u hired that same model again :cool:

    And sun in Melbourne? :idk:
     
    GreyImport, Jul 19, 2015
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  9. MCiN7

    MCiN7 Well-Known Member

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    Cheers! Haha.

    Yep, two days in a row during winter...amazing
     
    MCiN7, Jul 19, 2015
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  10. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    maelstrom, Jul 19, 2015
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  11. Mclaren

    Mclaren Well-Known Member Contributing Member

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    Oh me 2 Blair sending email now
     
    Mclaren, Jul 19, 2015
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  12. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    Sorry for all the hijacking of your thread Matt! Excuse me for one second *purchases 108 105 105 108 jets & a carb tune*.
    Your dyno and posts have helped tremendously =p.
     
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    Damus, Jul 19, 2015
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