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Requesting pictures fzr250 1990 3ln1 engine + idle question

Discussion in 'Yamaha 250cc In-Line 4's' started by Amak, Sep 10, 2009.

  1. Amak

    Amak New Member

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    Hey guys,

    Just wondering if anyone here has this model bike? I'm after a picture of the top of the engine with the air box removed to checkout the top of the carbies. There are two right angle nozzels coming from either set of the carbies facing eachother, when I got the bike there was nothing connecting to either of them. Unsure if they are supposed to hook up to something or each other (for now we have connected them to each other).


    Also does anyone know what RPM the bike should idle at?

    Cheers
     
    Amak, Sep 10, 2009
    #1
  2. simidau

    simidau Well-Known Member

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    My Bike:
    CBR250RR
    The things on the carbie just sit there, nothing connects to them on mine. Some sort of vent.
    Idle ~ 1600rpm I think.
     
    simidau, Sep 10, 2009
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  3. Amak

    Amak New Member

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    Cheers, I found out the idle question in another topic :p (tuning carbies funly enough).

    Just seems real odd how they are just there wide open. I tried looking through all the manuals posted up but I couldn't find any real good photo's. You'd think they would atleast connect to eachother to keep the right ratio of pressure and whatnot.
     
    Amak, Sep 10, 2009
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  4. glen5122

    glen5122 New Member

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    no they are just vents with i belive some valve in the little blace plastic part. just push them own and dont worry about them
     
    glen5122, Sep 11, 2009
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  5. Amak

    Amak New Member

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    My ones have black nozzles but there is no valve, you can blow straight through them.
     
    Amak, Sep 13, 2009
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  6. glen5122

    glen5122 New Member

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    yeah they r just some kind of equalising line for the diaphrame for the slider in the carb.
     
    glen5122, Sep 25, 2009
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  7. Romantix1

    Romantix1 New Member

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    "yeah they r just some kind of equalising line for the diaphrame for the slider in the carb."

    Wtf does that mean? lol, by slider, do u mean the slider for choke?

    I thought it was to equalise the air intake through carbs.
     
    Romantix1, Oct 12, 2009
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