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Help MC19 Carburettors

Discussion in 'Honda 250cc In-line 4's' started by Jacob Lowe, Mar 12, 2018.

  1. Jacob Lowe

    Jacob Lowe Member

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    Hey everyone new to the forum just wondering if anyone has a set of FCR 28 carbs that are set up to suit mc19/mc22 i have tried a few sets of carbs on my bike and cant seem to get it too run right would love to start fresh with a newish set of fcr and avoid buying another worn set of carba thanks .
     
  2. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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    Hey Jacob

    Fcr’s are great for people with deep pockets and plenty of time to pay someone to tune them on a dyno. If you have a few sets of mc19 carbs, can I suggest you try a carb seal kit from litetek.co and maybe new needles and emulsion tubes . New mc19 stuff is very thin on the ground , however you can source keystar kits from Motocycle Spares Warehouse in Melbourne , might cost you a few bucks but you should end up with a nice set of carbs at the end.

    I have seen new sets of fcr’s going for $2000, another option is using mc22 carbs and airbox, there are a few guys running this setup.

    You have to remember that your mc19 carbs are almost 30 years old , the seals sit on top of a engine that runs quite warm and they do wear out over time, lucky we still have people making kits
    Kiff
     
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  3. my67xr

    my67xr Well-Known Member Premium Member Contributing Member

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  4. ruckusman

    ruckusman Well-Known Member Premium Member Dirty Wheel Club

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  5. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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    Carbs usually just need a good clean and overhaul and some decent tuning and sometimes fixing some dodgy work by previous owners ... this forum is full of information on those things

    The most difficult thing to get right on these old inline 4s is the carbys

    http://litetek.co/Carb_Kit_Honda_CBR250R_MC19.html
     
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    Last edited: Mar 12, 2018
  6. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    I think that the Honda carbs, now that I own one, do not suffer the needle and emulsion tube wear like the Mikuni's because the needle is separated from the difference in air pressure, either side of the slide, by an o-ring. This means at idle it does not vibrate itself to death. Judging by the thickness and the state of the joint o-rings (the ones between the carbs) on mine I would think that replacing those is a must if your carbs seem dodgy. Ask @kiffsta he has played with a million Hondas.
    cheers
    Blair
     
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  7. ruckusman

    ruckusman Well-Known Member Premium Member Dirty Wheel Club

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    Can you take a pic or two of this?
    Interested to know if that solution is potentially adaptable
     
  8. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    The Honda setup is not easily adapted but my solution is to bore an o-ring groove into the bottom of the slide. I just have not got around to doing it yet. Not enough hours in the day.
     
  9. my67xr

    my67xr Well-Known Member Premium Member Contributing Member

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    MC19

    honda-cbr250r-1988-j-japan-mc19-100-e-16-1_big3IMG01110028_5f93.gif


    MC22

    carburetor_bigma000084e17-1_b8db.gif
     
  10. Jacob Lowe

    Jacob Lowe Member

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    The carbs have been cleaned and am capable of tuning them myself the set i had worn out the needles and needle holder had ovalised causeca cruising richness so i knocked them out and replaced them with a secondhand set there a pain in the arse to get out and back in evenly with out slightly upsetting the needle heights im thinking this is most of my issue. Fcr are expensive i thought maybe a second hand set would go for around $600 obviously not a good running set of VG05's would be fine. Whats involved in fitting the 22 flat slides does the airbox fit under the 19 tank?
     
  11. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Oops, my bad. The MC19 does not have the needle o-ring feature.
     
  12. Jacob Lowe

    Jacob Lowe Member

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    Can anyone help me what is required to fit the 22 carbs to the mc 19 i understand the airbox is quite different, so id imagine it would foul the snorkle on the tank and also the throttle cables are slightly different. Any one done the swap? Thanks
     

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