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Help CB250 spark plugs

Discussion in 'Honda 250cc Twins' started by CammedStang, Jun 19, 2015.

  1. CammedStang

    CammedStang Member

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    My Bike:
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    2000 honda cb250
    I recently bought this cb250 and was going to do a tune up a saw that the plugs are milkish dark . (pic1 and Pic2)

    Pic1
    http://i1315.photobucket.com/albums...3-19AC-48DE-8B2D-8C0BB6B98E70_zpskjw21zod.jpg

    pic2
    http://i1315.photobucket.com/albums...3-A2F5-4E2C-B1A6-6A164FFE78AE_zps0puroqke.jpg

    Maybe Running Lean????? the spark plugs that came out was the NGK C6HSA. The previous owner gave me NGK C7HSA.I read on other forums that CR6HSA so went out and bought CR6HSA.

    Which is the correct spark Plug??


    One more Question In Pic 3 below is these the adjusment for the Air/Fuel?
    what adjustment are in pic 4?


    Pic3
    http://i1315.photobucket.com/albums...6-3DBC-49E6-A587-ECDE4988E269_zpsw2ax3pre.jpg


    pic4
    http://i1315.photobucket.com/albums...C-D692-4055-831F-2BD1034A0D59_zps9zmpqsig.jpg
     
  2. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    actually that brown colour is good fuel/air. if it was me i would keep using the c6hsa's.
    ORRRRR you could try the "brisk NAR15YS" and tell me if it gives you a 3% hp increase =p?????
     
  3. Murdo

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

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    Pic 3 is the drain screw for the fuel bowl.
    Pic 4, the black knob is for adjusting the idle speed.
    What plugs does the manual say should be in the motor?
    Try running the C7HSA and see if there is any difference. If not, the CR6HSA should work ok.
     
  4. CammedStang

    CammedStang Member

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    Sadly I didn't get a copy yet . Is c7hsa a heat range up from cr6hsa?
     
  5. CammedStang

    CammedStang Member

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  6. CammedStang

    CammedStang Member

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    Where would the air/fuel adjustment be on the carb?
     
  7. Murdo

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

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    A '7' is a colder heat range than a 6. If CR6HSA is the standard plug then go with that (unless you plan to run at Bonneville).
    The idle mixture screws would most likely be on the side or bottom of the carb bodies.
     
  8. ea6rf_toni

    ea6rf_toni Active Member

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    The air adjustment screw this down the neck of the carburetor intake you need a short screwdriver

    no corras mas que tu angel de la guarda pueda
     

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