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mixture screws. where are they...

Discussion in 'XJ Technical Chat' started by sk8tboar, Jun 28, 2009.

  1. sk8tboar

    sk8tboar Member

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    Does anyone have a picture of the air/fuel mixture screws? There on the carbs (correct?) but the only screws i see if the valve clearance screws for carbs 1,2,4. and also the carb float bowl screws.

    Still learning guys! I'll get there. (BTW today i just relised my float bowls were on the wrong carbs with some of the float screws facing the wrong way)
     
    sk8tboar, Jun 28, 2009
    #1
  2. MN-Maxims

    MN-Maxims St. Paul Minnesota

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    Top of the carbs just forward of the chrome hats you'll see a tower on each carb. Most likely the brass plugs are still in yours. See thread on hoe to drill and pull those out.

    MN
     
    MN-Maxims, Jun 28, 2009
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  3. sk8tboar

    sk8tboar Member

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    Any idea on what to search to find that thread? Ive been searching for 2 hours about these screws : P

    Thanks for the help thus far


    EDIT: Also are they the things connected to the choke?
     
    sk8tboar, Jun 28, 2009
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  4. jarreddaughtry

    jarreddaughtry Member

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    for some reason i cant post the pic of the carb diagram i have. if you send me your email address i will send you the diagram pic. it is the diagam out of the haynes manual.
     
    jarreddaughtry, Jun 29, 2009
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  5. RickCoMatic

    RickCoMatic Well-Known Member

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    If you cant find the Screw ... you likely have THIS Anti-Tamper Plug installed in the Housing.

    The plug needs to be removed.
    You need to Drill the Plug's center just through.
    Take extreme caution not to touch the BRASS Screw just beyond the Plug.

    [​IMG]
     
    RickCoMatic, Jun 29, 2009
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  6. corgitwo

    corgitwo Member

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    Rickomatic, my 82 xj650 carb area around the mixture screw doesn't look at all like the pic above. I'm thinking maybe the carbs are different between years.
     
    corgitwo, Jun 29, 2009
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  7. wamaxim

    wamaxim Active Member

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    The big dogs will chime in soon for most of your questions. Do all the plugs soot up or just 1 or 2? Have you sniffed the oil fill hole to see if there is gas in the oil? No gas spots on the ground?

    you are right. Awfully poor mileage for one of these lean running 650's.

    The mixture adjust is for the idle circuit but from what I've read it does carry over into the high speed circuit.
     
    wamaxim, Jun 29, 2009
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  8. sk8tboar

    sk8tboar Member

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    Sweet thank you guys i see them. The cover is sticking out and attached to something though

    Problems ive been having inclde:

    sluggish response under 3k
    weird idling
    lite colored smoke for 5 sec on startup
    gas in the carb boot (Float bowl to high?)
    Bike seems like its a 250cc. wouldnt run 0-60 in under 5 sec : P
     
    sk8tboar, Jun 29, 2009
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  9. RickCoMatic

    RickCoMatic Well-Known Member

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    The Photo is a Mikuni Carb.
    They are in the SAME Place on Hitachi.
    Just to the right of the Enrichment (Choke) Valve.
    There is a FLAT "Shelf: right there on Hitachi's.
    The "Shelf" will either have an open hole to look into and see the Screw Head
    Or, ... be Plugged and the Screw nestled below the Plug ... needing the Plug's removal to adjust it.
    [​IMG]
     
    RickCoMatic, Jun 29, 2009
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