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Project MC19 '89 250r

Discussion in 'Your 250cc Projects' started by an_anonymous_user, Dec 5, 2020.

  1. Murdo

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

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    Clean the corrosion off with wire brush, sandpaper, file or even acid. Then coat the contacts with dielectric grease (or petroleum jelly/vaseline) to stop further problems.
     
  2. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Anywhere that main power is, so positive battery strap, main fuse, starter solenoid, starter motor.

    On the earth side, battery earth, engine/frame earth points.
     
  3. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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  4. an_anonymous_user

    an_anonymous_user Active Member Premium Member

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    side question, which power lead goes to which coil/side of which coils.
     
  5. Murdo

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

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    Do you have a wiring diagram?
     
  6. an_anonymous_user

    an_anonymous_user Active Member Premium Member

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    I dont, i quite desperately need documentation for this bike
     
  7. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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  8. an_anonymous_user

    an_anonymous_user Active Member Premium Member

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    finally got around to filing the corrosion off of the terminals, and tried to start the bike, the starter motor still sounded near dead as well as the battery & its terminals being quite hot. any ideas on what else could be the issue?
     
  9. Krompot

    Krompot Well-Known Member Premium Member

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    heat on terminals = bad connection

    try powering the starter directly from a known working battery. This will confirm it's working properly.
     
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  10. an_anonymous_user

    an_anonymous_user Active Member Premium Member

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    what exactly do you mean by this?
     
  11. inchoate

    inchoate Well-Known Member

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    unplug the starter from the wiring harness and hook it up to a battery you know is good and is fully charged.

    wear your safety goggles and take every other precaution you can think of.
     
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  12. Krompot

    Krompot Well-Known Member Premium Member

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    Disconnect the wire that runs from the starter motor to the starter solenoid. If you know your battery works (measure the voltage while you crank the engine. it shouldn't drop below 10ish volts) then use that, if it's old, use a different (working) one. Connect the negative to the frame and touch the wire from the starter onto the positive terminal. Do it quickly, and don't touch the terminal. It will spark and might get hot.
     
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  13. DannoXYZ

    DannoXYZ Well-Known Member

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    1. what's battery voltage?
    2. what's battery voltage when cranking?
    3. can you spin engine 360-degrees by hand?
     
  14. an_anonymous_user

    an_anonymous_user Active Member Premium Member

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    my project mc19 has been non-functional since i got it and recently i have made great progress towards getting it to function, as of yesterday i indentified that it could be a spark and/or firing order issue. i think i may have rectified this, however i am having issues verifying that i have fixed this issue. it may also be a fueling issue, as i do not have the fuel tank mounted, or a fuel pump either, so if there are issues with starting these bikes on low fuel pressure that could be a cause.

    - thanks in advance.
     
  15. jmw76

    jmw76 Well-Known Member

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    You should be able to get fuel into the carbs by attaching a suitable bottle and tap to the fuel line leading into the carbs. Just make sure that the bottle is held above the height of the carbs. I believe the pump is there because under certain conditions the fuel level in the tank is lower than the float bowls.

    Make sure your carbs are nice and clean, no air leaks (intake boots), you have new plugs, FRESH FUEL, and the ignition leads and caps are in good order (a good health spark across each plug when they are out of the motor. The body of ALL plugs should be connected to the the chassis of the bike or engine block).

    These little bikes need everything just right in order to run correctly. With pots of only 62.5cc, you do not need much to go wrong to result in problems.

    Work on one problem at a time. Start with the obvious and simple ones, such as spark plugs.
     
  16. an_anonymous_user

    an_anonymous_user Active Member Premium Member

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    apologies in advance for the lack of good photos, or photos plural, but there isnt really much to show. got this all the way back in december 2020 but havent made great progress until now. i think i have almost got it starting. but sadly it would appear that the previous owner has made quite the few.... "modifications" which is rather unfortunate for me seeing as it's my first project bike, but i have it and i can make do with what i can get. help however is always appreciated. tell me what you guys think.
    the involuntary modifications include;
    • straight piped with a muffler delete and a 3" can from a car
    • retrofitted with a mid 2000's cbr600 front cowl
    • retrofitted with new lights

    IMG_20210716_194433.jpg
     
    Last edited by a moderator: Aug 25, 2021
  17. an_anonymous_user

    an_anonymous_user Active Member Premium Member

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    i'll get to that right now, thanks for the advice
     
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