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Thread: '92 CBR250RR questions

  1. #1
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    '92 CBR250RR questions

    I want to know if the 1992 CBR250RR (MC22) have interference engines or not. Also, does it have a cam belt or cam chain?

  2. #2
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    Quote Originally Posted by alarumba
    I want to know if the 1992 CBR250RR (MC22) have interference engines or not. Also, does it have a cam belt or cam chain?
    Wtf is an interference engine??

    The answer to question 2 is neither, gears all the way

  3. #3
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    as far as i'm aware they have neither a chain or a belt they are gear driven cam's

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  5. #5
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    They are gear driven cams (and the best i've seen - take a hammering) and no - not interference engine as far as I know, although the tolerence is pretty close. You'd have to skim the head and remove the gasket to get a valve and piston to meet I think.

    I've not measured the gap between the piston crown and the valve at full extension. so I could be wrong.

    (from memory an interference engine is where the valve comes down lower than the top of the piston crown at TDC - if the timing is out, the two will connect and 'interfere' I suppose).
    The contents of this post are my opinion and may not be subjected to any form of reality
    It means I'm not an authority or a teacher, and may not have any experience so take things with a pinch of salt (a.k.a bullshit) rather than fact

  6. #6
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    Quote Originally Posted by k14
    Wtf is an interference engine??
    A poorly designed engine. If the cam-belt/chain breaks, the valves stop and the piston crashes into them, destroying the piston, the casing, rendering the engine useless. Most modern cages have interference engines and thats why you have to replace the cam-belt/chain so regulary cause when it happens in a cage, you have to remove the engine, and replace it, and in most cages, it isn't worth it.

    I'm pretty damn relieved the CBR runs on gears

    Note: this is what I've been told, if it is wrong, correct me

  7. #7
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    Quote Originally Posted by alarumba
    A poorly designed engine. If the cam-belt/chain breaks, the valves stop and the piston crashes into them, destroying the piston, the casing, rendering the engine useless. Most modern cages have interference engines and thats why you have to replace the cam-belt/chain so regulary cause when it happens in a cage, you have to remove the engine, and replace it, and in most cages, it isn't worth it.

    Note: this is what I've been told, if it is wrong, correct me
    Almost right. It's not 'poor design' as you say, and although it can potentially result in major engine damage if a cambelt breaks, it doesn't always. Sometimes nothing happens, and sometimes it's limited to valve damage (as on my FahrtSturm when the previous owner had the CCT break and the camchain skip some teeth on the camgear. Oops.) And regular replacement of camchains isn't usually required - they usually last a long time (except on Hondas....)
    ... and that's what I think.

    Or summat.


    Or maybe not...

    Dunno really....


  8. #8
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    Bro, nothing wrong with the CBR (Someone will disagree)

    Just to reinforce what the others say, even though you know, the cams are gear driven and no, it is not an interference engine. Just out of curiousity,why do you ask?
    To every man upon this earth
    Death cometh sooner or late
    And how can a man die better
    Than facing fearful odds
    For the ashes of his fathers
    And the temples of his Gods

  9. #9
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    Quote Originally Posted by Sniper_CBR
    Just out of curiousity,why do you ask?
    Out of curiosity and paranoia

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