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Project 1991 CB250N

Discussion in 'Your 250cc Projects' started by Stubanger, May 9, 2017.

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  1. Stubanger

    Stubanger Well-Known Member Premium Member

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    Picked this one up a few weeks ago, been slack on posting,busy cleaning up shed and fixing other cars/bikes. Currently no spark, wiring mess from previous owner....more to come

    CB250N 1.JPG
     
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    Stubanger, May 9, 2017
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  2. Stubanger

    Stubanger Well-Known Member Premium Member

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    New parts on the way
    20170509_195753-600x800.jpg
     
    Stubanger, May 10, 2017
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  3. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Nice score,
    i used to work with a guy year's ago that had one the same, he used to ride it from Mt Barker to St Mary's every day and back home each night.

    With the stator giving no continuity at all, have you tried checking it back closer to the winding's ?
    (.02 may just be the loss at the meter, touch the 2 probe's directly together to check to see if it's the same reading)
    One of the wire's may have broken between the winding's and plug's at the end of the lead's, possibly where that grommet is at the top left of the loom or on one of the sharper bend's?

    Poke a couple of pin's through the wires' insulation about 200mm from the winding's and try measuring it there
     
    my67xr, May 10, 2017
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  4. Stubanger

    Stubanger Well-Known Member Premium Member

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    Thanks for the advice @my67xr. I've always wanted a CB250 for a commuter but never found a "cheapie", had a good run with a 81 SR250, 82 GS125 and 94 XV250 for my daily commuters(50-60km round trip)

    I will check closer to the windings tonight. I did give it to a friend to test as he's a sparky (im not a sparkys ahole lol) and i think my multimeter came from a gag magic showbag!
     
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    Stubanger, May 10, 2017
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  5. Stubanger

    Stubanger Well-Known Member Premium Member

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    Current state of killswitch: 20170510_214119-600x800.jpg
    The tab is loose im guessing that needs to be touching however no idea which colour needs to be soldered to either point. I think black/white wire goes to cdi...

    Also tested the stator with a new multimeter(not cheap shite haha) and got 0.4, thats within spec and nothing to earth, also checked pulse generator-all good. Must be a cracked wire somewhere/killswitch/ignition barrel/coils........one day
     
    Stubanger, May 10, 2017
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  6. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    I'm guessing the wire's will work soldered either way.
    Does something move and contact the other terminal when you flick the switch to kill?
     
    my67xr, May 10, 2017
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  7. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    If the wire from the cdi (black w/white stripe?) was touching an earth eg handlebar's, then the bike wouldn't start
    Should be a 5 minute job to fix the kill switch if it's still good and then it might start ?

    I could come up and give you a hand if you need any help
    If the kill switch isn't repairable i could lend you a generic kill switch to use until you find a good one
     
    my67xr, May 11, 2017
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  8. Stubanger

    Stubanger Well-Known Member Premium Member

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    I'll try and solder them tonight, i have tried earthing the wires to the bars - still no spark. I will test the ignition coils tonight with the good multimeter. Going to go over the whole bike and do all the tests in the manual, just printed it at work - will record results.

    Thanks for the help offer but im not ready to admit defeat yet haha, i have a few wrecks that i might be able to poach a kill switch from however the CB is a 91, my bikes are 60s - late 80s haha
     
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    Stubanger, May 11, 2017
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  9. Stubanger

    Stubanger Well-Known Member Premium Member

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    Stubanger, May 11, 2017
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  10. Snod Blatter

    Snod Blatter Active Member Dirty Wheel Club

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    Indeed, the kill switch not connecting will not affect the running of the bike - if in doubt you can pull apart the bullet connector (I think the wires are black and white?) in the headlight bowl and remove it from the equation entirely.

    Are you sure the pickup next to the flywheel is working? A mate had one fail on his CD250U recently, though it only stops working when the engine is hot..
     
    Snod Blatter, May 12, 2017
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  11. Stubanger

    Stubanger Well-Known Member Premium Member

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    The pickup tested within spec, however after lots of research on rebel/CBR forums the pickups tend to fail a lot! I'd pinch one off of my CBR250R thats in bits however that has the same problem!

    Think im going to bite the bullet and buy a new one in a couple weeks. After the Finke desert race :D
    http://www.ebay.com.au/itm/291355969805?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT
     
    Stubanger, May 12, 2017
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  12. ea6rf_toni

    ea6rf_toni Active Member

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    This parts the second hand in spain have a many in the milanuncios web

    Enviado desde mi Redmi 3S mediante Tapatalk
     
    ea6rf_toni, May 15, 2017
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  13. ea6rf_toni

    ea6rf_toni Active Member

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    ea6rf_toni, May 22, 2017
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  14. Murdo

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

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    Nice.
     
    Murdo, May 22, 2017
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  15. Stubanger

    Stubanger Well-Known Member Premium Member

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    Update: new stator n pickup fitted, still no spark...... Good news is i did manage to fit it on the lift in the shed to save my back a little.
    20170626_172801-600x800.jpg 20170626_181155-800x600.jpg
     
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    Last edited: Jun 27, 2017
    Stubanger, Jun 27, 2017
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  16. Stubanger

    Stubanger Well-Known Member Premium Member

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    Update:
    • Cleaned EVERY connection on the bike with contact cleaner
    • Replaced fuses
    • Bought 3 new cdi units........$$$$$$
    Still no spark :( everything tests within spec as stated in the manual. Its got to be something simple!
     
    Stubanger, Dec 19, 2017
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  17. kiffsta

    kiffsta Senior Member

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    what is the impedance on the pulse coil ?
     
    kiffsta, Dec 19, 2017
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  18. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    You need to do some more diagnosis. Are you getting a plausible signal from the pickup? Are any of the ignition units picking that up? Is the TCI/CDI properly sending the signal/collapsing the field to the coils? Are the coils outputting anything? Are the leads and caps OK? Are the plugs new?
     
    Linkin, Dec 19, 2017
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  19. Stubanger

    Stubanger Well-Known Member Premium Member

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    119.5
     
    Stubanger, Dec 21, 2017
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  20. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    When you are testing all the Ohm's reading's, are you subtracting the Ohm's reading between the red and black lead's ?
    Turn your meter on to 200 Ohm's, touch the black probe to the red probe, how many Ohm's are you getting there ?
     
    my67xr, Dec 21, 2017
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