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Carb balance FZR3LN

Discussion in 'Yamaha 250cc In-Line 4's' started by willfzr2503ln, Dec 17, 2013.

  1. willfzr2503ln

    willfzr2503ln Active Member

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    My Bike:
    fzr 250 3ln
    Im getting a carbtune pro carb balance tool
    just wondering if anyone has balanced there fzr themselves with a proper gauge
    and what number they should sit on
    any tips would be greatly appreciated
     
    willfzr2503ln, Dec 17, 2013
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  2. Jim

    Jim Active Member

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    I'm sure someone who's more versed with FZR will step in, but you usually balance the carbs so they're within a certain amount of vacuum relative to each other. The actual amount of vacuum for each cylinder or a particular cylinder will be specific to your engine.

    The actual process will be specific to your model.
     
    Jim, Dec 17, 2013
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  3. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    As far as I know they dont need to be on any particular number .... they just have to all read the same.

    I believe theres a correct order when turning the screws.... I think its something like balancing 1 and 2 , then 3 and 4, then 2 to 3 .... something like that .... need to check on that.

    Blip the throttle between each adjustment
    Have the airbox on.
    Watch the temp gauge.

    Theres a few vids on youtube showing syncing 4 carbs

     
    GreyImport, Dec 17, 2013
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  4. willfzr2503ln

    willfzr2503ln Active Member

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    yeah grey i think those numbers sound right according to the write up on fzr 250 . com
    im sure i have seen a carb vacuum pressure somewhere on a jap manual
    found it my bad guys its 18. 7 kpa or am i reading another measurement all together
     

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    willfzr2503ln, Dec 17, 2013
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  5. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    In my experience it is more important to have the balance of the carbs the same ie; all the same vacuum, as there are too many variables to fit to a figure. For example, valve clearances, ring wear, carbon deposits, air cleaner restriction, exhaust design, humidity and temperature, even idle speed will all make a difference to the vacuum reading. Get the reading the same on all carbs and enjoy the ride.
     
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    Murdo, Dec 18, 2013
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