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Help Carb sync

Discussion in 'Yamaha 250cc In-Line 4's' started by Mickey250, Jul 16, 2017.

  1. Mickey250

    Mickey250 Active Member

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    i just wondering how can i adjust sync screw at the carby..it is upsidedown!
     
  2. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Can you take a photo and show us what you mean?

    You will probably need to borrow a sync screw tool to get at them. You also need a set of sync gauges to get the sync correct.

    VS0530.jpg
     
  3. Mickey250

    Mickey250 Active Member

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    image.jpeg
    This carb(not fzr) sync screw is facing upward then in our carb fzr looks like this facing downward(this is my spare carb)
    image.jpeg
     
  4. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Thats how they are ... these are mine ... just sync them on the bench

    Carb Bank.jpg
     
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  5. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Yeah my 3LN3 carbs have the centre screw acessed from the top and the one's between 1/2 and 3/4 are accessed from the back behind the bottom of the fuel bowls between 1/2 and 3/4.
    All are easy to get to and adjust.
    I synced mine on the bench first with a piece of wire, but then synced them again with my Carbtune balancer, it made a lot of difference after doing them again on the engine.

    20170717_130535.jpg 20170717_130700.jpg 20170717_130926.jpg

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