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what screw is this?

Discussion in 'XJ Technical Chat' started by munkiep, Mar 6, 2010.

  1. munkiep

    munkiep Member

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    and what does it do by turning it in and out? i am a VERY VERY visual person. its hard for me to comprehend things unless i see it [​IMG]
     
  2. truckerbikes

    truckerbikes Member

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    that i believe is the mixture screw. adjusted when balancing and syncing your carbies
     
  3. PainterD

    PainterD Active Member

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    I do believe that's your air mixture screw? The photo isn't very clear which direction I'm looking at the carbs.
     
  4. KrS14

    KrS14 Active Member

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    100% Idle mixture screw.
     
  5. munkiep

    munkiep Member

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    so clockwise is less fuel and CCW is more fuel?
     
  6. PainterD

    PainterD Active Member

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    Yes. After you make your final adjustments, you should probably seal them with silicone sealer to prevent dirt from settling in them and making future ajustments a pain in the a$$.
     
  7. Hillsy

    Hillsy Member

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    I don't think that's a very good idea - especially if you wish to clean the carbs sometime in the future.
     
  8. PainterD

    PainterD Active Member

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    Hillsy,
    What are you referring to?

    What I am referring to is, you remove the cap over the screw, adjustments are made, etc., than you put a dab of cilicone over the top of the screw opening to keep dirt fro settling in there (and it will) Or I guess I've read somewhere on this forum where members have found little plugs of some kind that fit int he hole also.
    And what would that have to do with cleaning the carbs anyway?
     
  9. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    -those are your idle mixture pilot screws; yes, CCW is more fuel, screwing them in is less. Don't monkey with them yet.

    -they are a FINE TUNING point, after the carbs are vacuum synced.

    -they had plugs in them from the factory to prevent tampering.

    -you can still get the plugs if you want.

    -if you keep your bike properly maintained there is no reason to re-seal them.

    -what they have to do with cleaning the carbs is that they need to be removed to do it completely and correctly. The factory did not want you to touch them, hence the exclusion of that part of the carb from the cleaning procedures.

    -they are easily damaged so if you see any signs of dirt, corrosion, etc; start with a shot of Kroil in each one and leave them alone until you do the carbs.
     
  10. PainterD

    PainterD Active Member

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    I have to disagree. Those holes will get dirt/dust build up in them eventually and it needs to be kept clean. It's just alot better to prevent the dirt from forming down there, then trying to clean them out. I'm just sayin'. You can do whatever trips your trigger.
     
  11. munkiep

    munkiep Member

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    well i did pull them out to clean the passageways. i noticed the dirt build up before hand so i sprayed brake cleaner in there and hit it with 100psi of air and i had no problem removing them. arent the specs for reinstallation something like bottom them out, then 2-1/2 to 3 turns out for base setting
     
  12. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    Sounds like a good idea, but how about making silicone plugs rather than squirting silicone in there?
    Find a drinking straw of just the right size. Let the silicone set up in the straw. Cut with a razor.
     
  13. munkiep

    munkiep Member

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    or, find some rubber hose that fits in there snugly then thread a screw into it to expand the rubber for a tight seal?
     
  14. munkiep

    munkiep Member

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    ok, so in chacal's "church of clean", the idle mixture screw consists of 5 parts, give or take the tamper cap. my question is, the o-ring at the base...what condition should it be in? because a couple of mine were flat or contoured to the flare of the base of the circuit that it sits in. also, one of them had a "tingy" sound as i was backing it out, i assume the spring...normal?
     

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