1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Help Need the MC22 brains trust

Discussion in 'Honda 250cc In-line 4's' started by kiffsta, Aug 21, 2018.

  1. kiffsta

    kiffsta Senior Member

    Messages:
    9,066
    Likes Received:
    6,872
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    Ahh, that is for the mc19, the
    Mc22 addendum is in the back of that manual, it is a single pickup in the mc22 up and should be 470-530 ohms from memory. Something else to add is that the engine hunts quite a lot , ie is runs when he idle is set to 2000 - 2500 rpm and happy sits there for a bit then it might jump up for a bit to say 2800rpm then settle and drop to 1400rpm then stalk.

    I am going back to it this morning , I will retest everything and try and find what is breaking down

    I appreciate everyone’s input so far, this one sure has me stumped
     
  2. kiffsta

    kiffsta Senior Member

    Messages:
    9,066
    Likes Received:
    6,872
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    I have spare , I will swap it out
     
  3. kiffsta

    kiffsta Senior Member

    Messages:
    9,066
    Likes Received:
    6,872
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    These will be done today, this is where I think the issue could be
     
  4. kiffsta

    kiffsta Senior Member

    Messages:
    9,066
    Likes Received:
    6,872
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    Will do
     
  5. kiffsta

    kiffsta Senior Member

    Messages:
    9,066
    Likes Received:
    6,872
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    I have tested the coils when they are hot and cold , I am testing the impedance from cap to cap and have wriggled the leads and it stays at around 25 ohms
     
  6. XCite Bikes

    XCite Bikes Parts and Accessories Staff Member 250cc Vendor Contributing Member

    Messages:
    288
    Likes Received:
    220
    Trophy Points:
    273
    Joined:
    Aug 10, 2013
    Gender:
    Male
    Location:
    Sydney, NSW
    Home Page:
    My Bike:
    CBR250RR
    Chris, because you swapped the carbs and plugs, I don't think it will be fuel related. Most likely electrical. Either a faulty component, or just a loose wire. Are you absolutely sure the harness you put in is a good one? I have a harness with one wire broken, so the left ignition coil doesn't get enough power to work properly. I found the wire in question, it was broken, but partially touching so it let some current through.

    If you have another set of harness / coils, give it a go. At least you can take that part out of the list of possible issues.
     
  7. kiffsta

    kiffsta Senior Member

    Messages:
    9,066
    Likes Received:
    6,872
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    Will do Omar , I have the mc22 that I bought on the weekend, I have lots of
    Spares. What is frustrating me is that the cause is not easily identifiable , I know these bikes really well and I am confident in troubleshooting ability , this gremlin is down right evil.
     
    • Like Like x 1
  8. kiffsta

    kiffsta Senior Member

    Messages:
    9,066
    Likes Received:
    6,872
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    for those playing at home, I swapped the coils off my race bike, same symptoms. Swapped the harness with a spare and found that someone had swapped the stator connector from female to male, so that one has gone into the scrap wiring bucket, I located my last spare harness and installed it, same symptoms. Swapped the TCI, same symptoms, swapped the reg with a unknown one and measured the voltages, it was 17v across the battery, stopped the bike, threw that one out, grabbed another, got 14.2v at 4000rpm tested the stator again and it should be .01 - 0.05 of an ohm per phase, these were almost at 1 ohm, decided to swap out the stator, I had to drain the oil and it came out milky so I guess it is time to do the head gasket.

    2 steps forward, 23 back.
    Doh..……. sometimes I just cant win.
     
    • Bummer Bummer x 1
    Last edited: Aug 22, 2018
  9. kiffsta

    kiffsta Senior Member

    Messages:
    9,066
    Likes Received:
    6,872
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    5101D1E7-6387-4A21-B808-EC044E17BA7E.jpeg
     
    • Bummer Bummer x 1
  10. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

    Messages:
    4,730
    Likes Received:
    2,870
    Trophy Points:
    943
    Joined:
    Mar 18, 2014
    Location:
    Sydney NSW
    My Bike:
    FZR250R 3LN6
    Hmm oil/coolant milkshake, not good.
     
  11. Wozza

    Wozza Active Member

    Messages:
    361
    Likes Received:
    191
    Trophy Points:
    148
    Joined:
    Mar 21, 2017
    Gender:
    Male
    Location:
    South Australia
    My Bike:
    GB250
    Uh oooh...take it out back and shoot it?.......
     
    • Like Like x 1
  12. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

    Messages:
    3,980
    Likes Received:
    2,208
    Trophy Points:
    923
    Joined:
    Nov 19, 2013
    Gender:
    Male
    Occupation:
    Gardener
    Location:
    Tasmania
    Home Page:
    My Bike:
    Spada, VT250F & ZX2R
    This one's fighting back.
     
  13. kiffsta

    kiffsta Senior Member

    Messages:
    9,066
    Likes Received:
    6,872
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    Head gasket is on order , should be here Friday
     
  14. TonyZXR

    TonyZXR Well-Known Member

    Messages:
    446
    Likes Received:
    259
    Trophy Points:
    273
    Joined:
    Apr 17, 2018
    Gender:
    Male
    Location:
    New South Wales
    My Bike:
    GPX250, ZXR250A, ZXR250C
    Nothing worse than an oil milkshake
     
  15. kiffsta

    kiffsta Senior Member

    Messages:
    9,066
    Likes Received:
    6,872
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    Indeed, a spare motor has gone in, she is now purring like a kitten. I will get a head gasket off xcitebikes and rebuild it, at least now I now what the vapour was, what is surprising is that when I changed the oil last time, there was no milkshake.
     
    Last edited: Aug 22, 2018
  16. Gert

    Gert Well-Known Member

    Messages:
    124
    Likes Received:
    122
    Trophy Points:
    248
    Joined:
    Jun 14, 2016
    Gender:
    Male
    Location:
    The Netherlands
    So, the headgasket was the only error why she did not start? Shouldn't the engine run with a "leaking" headgasket?
    There is/was compression in the cilinders?
     
  17. kiffsta

    kiffsta Senior Member

    Messages:
    9,066
    Likes Received:
    6,872
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    When I bought it 6 weeks ago, comp tests were very high, I am very. perplexed by this one
     
  18. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

    Messages:
    3,980
    Likes Received:
    2,208
    Trophy Points:
    923
    Joined:
    Nov 19, 2013
    Gender:
    Male
    Occupation:
    Gardener
    Location:
    Tasmania
    Home Page:
    My Bike:
    Spada, VT250F & ZX2R
    Have you pulled the head off? Is there a head gasket in there?
     
  19. kiffsta

    kiffsta Senior Member

    Messages:
    9,066
    Likes Received:
    6,872
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    Not yet, I am run off my feet this week , plus bumblebee needs to be reassembled

    Hard to find the mix between work and play with so many toys
     
    • Like Like x 1
    Last edited: Aug 23, 2018

Share This Page