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Help CBR250RR MC22 CDI to a Hornet 250 CB250FT Chassis/Wiring

Discussion in 'Honda 250cc In-line 4's' started by titos13, Feb 21, 2023.

  1. titos13

    titos13 Active Member

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    Hello guys, so I own a Hornet 250 CB250Ft but the previous owner installed a CBR250RR engine, It's MC14E-105 (I think CBR250RR(N) MC22?).

    So my chassis/cdi/wiring is from a hornet 250, with 16500 rpm rev limit,I bought an MC22 CDI, which has the same 16 pin connection, I tried it and I can rev until 19000 but after 4K RPM it's misfiring, like I run out of fuel or something.
    I got a video but on neutral, if you can listen to the sound, it's a lot worse when in gear, bike won't move and sounds like crap.

    Any ideas? Might be the wiring in the ignition coils wrong with the new CDI?

     
  2. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Best to have the correct wiring, ecu and clocks for the engine. Otherwise you will need to do a lot of wiring work to get it sorted.

    I think perhaps you are running into trouble with the speed restriction circuits. If the bike thinks you are in top gear or doing 180km/h because of wiring issues, it will cut or retard ignition.
     
  3. DannoXYZ

    DannoXYZ Well-Known Member

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    Does it rev smoothly with Hornet CDI?
     
  4. titos13

    titos13 Active Member

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    Are you sure there's a circuit like this in the 96 hornet? where exactly is it located?

    Yes, it does rev smoothly with the stock CDI!
    With the CBR250RR one, it does cut out almost like it's out of fuel or something. Does sound like a truck.
     
  5. jmw76

    jmw76 Well-Known Member

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    Why do you want to change the CDI? Is the bike not running properly?
    There is likely not a huge difference between the 2 motors. Particularly if it is a later RRR motor.
    If it is running ok. I would leave it alone.
     
  6. DannoXYZ

    DannoXYZ Well-Known Member

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    MC14 engine runs out after 16k-rpms anyway. Get nothing going past that.
     
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  7. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Same story with the ZXR's, peak power is at 16k anything above that is just noise and valve train begging for mercy
     
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