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Thread: Honda CBR 250R

  1. #24991
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    Default Re: Honda CBR 250R

    Thanks, I do know that it likes to rev up a little for few seconds if you start it fast, before it finished fuel pump priming, but never had the lights thing.

    Today I've disconnected the ECM again, and on the bike side of the connector checked ECT resistance while moving the harness around, could not detect a change in value. Did the same for MAP, TP, IAT, IACV (both combinations) and injector. They all have wires exiting the harness on the same place. Cannot measure any fault. But could not get it to fault today anyhow, moving the harness, riding for hours, including bumpy offroad, starting many times, didnt repeat the light thing from the video. So basically I only confirmed that all the sensors and iacv have good resistance values...

    I might have cleaned some connector by disconnecting/connecting it (applying contact cleaner also) but doubt it they all looked great. Battery is 4 years old with occasional worm up over winter without special battery charging, but it doesn't show signs of wear, I get about 12.5-12.7V from it before turning on the key, with key it drops to 12.0 which isnt the best but not the worst either. I'll put new one in over the summer, together with air filter and spark plug, parts stores not working now anyway due to covid19.

    Basically only stuff that I can conclude from yesterday when it did happen often after I fiddled with the harness is:

    - few times it looked like I made it happen with moving of the wires/harness of ECT (opened them up, they are not damaged, didnt open up to main harness)
    - lights show again immediately as the bike starts cranking, it doesn't wait till it starts up - in the video
    - like in the video, whatever I do with harness or anything, few seconds after it all settles down and bike is perfectly normal to drive, never permanent fault
    - never a MIL code

    All started after winter, I think I should replace the battery even though it measures good? I never remembered to measure voltage drop while the MIL/temp showed.

  2. #24992
    psr
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    Default Re: Honda CBR 250R

    Quote Originally Posted by akabreak View Post
    Thanks, I do know that it likes to rev up a little for few seconds if you start it fast, before it finished fuel pump priming, but never had the lights thing.



    I might have cleaned some connector by disconnecting/connecting it (applying contact cleaner also) but doubt it they all looked great. Battery is 4 years old with occasional worm up over winter without special battery charging, but it doesn't show signs of wear, I get about 12.5-12.7V from it before turning on the key, with key it drops to 12.0 which isnt the best but not the worst either. I'll put new one in over the summer, together with air filter and spark plug, parts stores not working now anyway due to covid19.

    Basically only stuff that I can conclude from yesterday when it did happen often after I fiddled with the harness is:

    - few times it looked like I made it happen with moving of the wires/harness of ECT (opened them up, they are not damaged, didnt open up to main harness)
    - lights show again immediately as the bike starts cranking, it doesn't wait till it starts up - in the video
    - like in the video, whatever I do with harness or anything, few seconds after it all settles down and bike is perfectly normal to drive, never permanent fault
    - never a MIL code

    All started after winter, I think I should replace the battery even though it measures good? I never remembered to measure voltage drop while the MIL/temp showed.
    From the Video and your post there are some possibilities I can think of..

    1. The battery had been sitting without charge for some time. This leads to formation of Sulphates on the plates , increasing the internal resistance and hence CCA.

    2. Since the bike had been sitting through winter possible condensation on connectors had taken place leading to development of loose contact.

    3. That the bike responds to the input indicates a Healthy ECM ,and with RPM building up, the warning lights as well as increase in RPM comes down.

    4. My bet is either Low charge , along with Sulphation of Battery or Connectors have started developing loose contact due to oxidation of contact area. I would recommend WD 40 spray on all the connectors both sides, and then check it out. If it does not help, try a battery with good charge.

    A healthy battery shows 12.5 volts or higher when resting. On cranking the self starter will come down by about a Volt or at best 11 Volts depending on charge level. On engine starting up , Voltage across battery on idle should be 13.2~14.2 Volts.

    Good Luck.
    Last edited by psr; 04-03-2020 at 10:23 AM.
    When Was The Last Time,You Did Something For The First Time.

  3. #24993
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    Default Re: Honda CBR 250R

    Quote Originally Posted by psr View Post
    From the Video and your post there are some possibilities I can think of..

    1. The battery had been sitting without charge for some time. This leads to formation of Sulphates on the plates , increasing the internal resistance and hence CCA.

    2. Since the bike had been sitting through winter possible condensation on connectors had taken place leading to development of loose contact.

    3. That the bike responds to the input indicates a Healthy ECM ,and with RPM building up, the warning lights as well as increase in RPM comes down.

    4. My bet is either Low charge , along with Sulphation of Battery or Connectors have started developing loose contact due to oxidation of contact area. I would recommend WD 40 spray on all the connectors both sides, and then check it out. If it does not help, try a battery with good charge.

    A healthy battery shows 12.5 volts or higher when resting. On cranking the self starter will come down by about a Volt or at best 11 Volts depending on charge level. On engine starting up , Voltage across battery on idle should be 13.2~14.2 Volts.

    Good Luck.
    Thanks a lot for your help. You confirmed my thought that ECM is fine as its compensating for it all on the startup. Every "mechanic" around here would first change ECM, then probably ECT, then likely the whole harness, and then maybe the battery. Thats why I dont even want to drive by them let alone give them my bike to work on. Sure they gonna fix it once they replace half the bike.

    About voltage, I do have voltage drop below 8V on good no issues/lights cranking, sometimes 7V, never managed to measure it when its faulty. Battery will be replaced, just hope it stands fine untill the part stores open, cant get this dimension on the gas station..

  4. #24994
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    Post Re: Honda CBR 250R

    Quote Originally Posted by akabreak View Post
    Thanks a lot for your help. You confirmed my thought that ECM is fine as its compensating for it all on the startup. Every "mechanic" around here would first change ECM, then probably ECT, then likely the whole harness, and then maybe the battery. Thats why I dont even want to drive by them let alone give them my bike to work on. Sure they gonna fix it once they replace half the bike.

    About voltage, I do have voltage drop below 8V on good no issues/lights cranking, sometimes 7V, never managed to measure it when its faulty. Battery will be replaced, just hope it stands fine untill the part stores open, cant get this dimension on the gas station..
    Absolutely not necessary to replace the ECM. As sir said, try replacing your battery, and degreasing the connectors every now and then. Once you replace your battery, we'll know how it will unfold. But, I am positive, it all has to do with the battery.

    Cheers!
    VJ
    Once upon a time, a guy asked a girl 'Will you marry me?'
    The girl said, 'NO!'


    And the guy lived happily ever after and rode motorcycles and watched sport on a big screen TV, went fishing and surfing, and played golf a lot, and drank beer and scotch and had tons of money in the bank and left the toilet seat up and farted whenever he wanted.


    THE END

  5. #24995
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    Default Re: Honda CBR 250R

    What is the price for CBR 250R CHAIN SPROCKET SET?
    DrAzlan likes this.

  6. #24996
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    Default Re: Honda CBR 250R

    Quote Originally Posted by Live free ride hard View Post
    What is the price for CBR 250R CHAIN SPROCKET SET?
    Pls Search GOOGLE bro lol

  7. #24997
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    Default Re: Honda CBR 250R

    If it is available in Google I have not posted hare bro. This sense u should have. Lol
    Quote Originally Posted by DrAzlan View Post
    Pls Search GOOGLE bro lol

  8. #24998
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    Post Re: Honda CBR 250R

    Quote Originally Posted by Live free ride hard View Post
    If it is available in Google I have not posted hare bro. This sense u should have. Lol
    The stock one costs approximately 2600 + Labor charges. The same one outside, Rolon made -- the stock is Rolon made too.
    Chain Sprocket Kit for Honda CBR250

    These guys are pretty much fast on shipping and are the same spec as the stock 14/38. If you can, you can purchase from the above link or get a quote from the SVC and then decide.

    Good luck.

    Cheers!
    VJ
    Once upon a time, a guy asked a girl 'Will you marry me?'
    The girl said, 'NO!'


    And the guy lived happily ever after and rode motorcycles and watched sport on a big screen TV, went fishing and surfing, and played golf a lot, and drank beer and scotch and had tons of money in the bank and left the toilet seat up and farted whenever he wanted.


    THE END

  9. #24999
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    Default Re: Honda CBR 250R

    Thanks a lot. Any idea about racing chain sprocket???

  10. #25000
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    Default Re: Honda CBR 250R

    Quote Originally Posted by Live free ride hard View Post
    Thanks a lot. Any idea about racing chain sprocket???
    I'm not sure about that though there are many variants of chain available from Rolon, i.e Gold series and what not, but why spend extra if you ride the bike for city and touring. The normal sprockets are more than enough, and will last longer with proper maintenance.

    Cheers!
    VJ
    Once upon a time, a guy asked a girl 'Will you marry me?'
    The girl said, 'NO!'


    And the guy lived happily ever after and rode motorcycles and watched sport on a big screen TV, went fishing and surfing, and played golf a lot, and drank beer and scotch and had tons of money in the bank and left the toilet seat up and farted whenever he wanted.


    THE END


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