CDI ??

Discussion in 'Electrical' started by Cookie, Sep 24, 2006.

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  1. Cookie

    Cookie Guest

    Ok here it goes I wiped out about a month ago and trashed my knee so I could not ride my bike ......last week I got on my bike and got it running but it started acting like it was not getting gas (checked the line it was flowing) then the engine just stopped firing I have checked the wiring, plug. and the only other thing I have to check is the CDI unit, is there something I can use instead of the CDI unit to see if the problem is in the CDI unit or in the motor.

    My motor mount is shot but that is no problem to replace.


    "Quemadmoeum gladius neminem occidit, occidentis telum est."
    ("A sword is never a killer, it's a tool in the killer's hands.") -
    Lucius Annaeus Seneca "the Younger" (ca. 4 BC-65 AD).

  2. Tom

    Tom Active Member

    Aug 4, 2006
    Likes Received:
    Have you done this yet:

    Pull the spark plug out of the head and plug it into the coil. When its dark, turn the engine over and see if you are getting spark...
  3. Cookie

    Cookie Guest


    not yet but will try it tomarrow
  4. thatsdax

    thatsdax Guest

    Unplug your blue and black wires from CDI. Take ohm meter and check between the blue and black towards engine magneto. You should get 250ohms, If not..It needs replacing...Thanks..
  5. Cookie

    Cookie Guest


    Thanks guys ..... I finaly got the beast running I swaped oput the cdi unit with an old one I had and put a shot of marvial mystry oil down the head (it was a little stiff) after a couple loud bback fires she started running like her old self.

  6. What does the cdi actually do? .... and does the kill switch hook up to the white wire or the black/blue?
  7. ringal

    ringal Guest

    CDI stands for capacitive discharge ignition.... The black box on these engines is a combination ignition coil and electronic box..... The engine internal generator charges a capacitor in the box and at the correct time the energy in the capacitor is dumped across the primary of the ignition coil causing a high voltage spark at the secondary and at the plug.....

    The connections are black wire from engine to black wire of coil, blue wire of engine to blue wire of coil ....... White wire to kill switch to ground/bike frame....... I suspect that by grounding the blue wire will do the same thing and kill the engine.....

    Regards Al
  8. I have the black the the black, the blue to the blue and the kill switch and the white to nothing yet and it seems to be working fine. I do have unexplaining sputtering after every 3 miles that I can't figure out tho...
  9. gone_fishin

    gone_fishin Guest

    look, i don't have my engine yet, but wouldn't that have to be a carb thing? every 3 miles sounds about right for a bowl-related problem, just guessing, maybe it'll help.
  10. bowl related? what kind of probs can you have with it - and is the bowl the part I circled here?

  11. gone_fishin

    gone_fishin Guest


    i have NOT yet had the chance to see one of these carbs, so i'm not sure what i'd find inside yours, i'm imagining a primitive float setup (someone who knows, clue us in), since u can reasonably expect to get about three miles on a smidgen of fuel, i'm (only) guessing your float-or-whatever is sticking or misadjusted?
  12. so do I need a new carb then? I will take it apart and see if I can see something wrong...
  13. gone_fishin

    gone_fishin Guest

    i saw cookie mention somewhere about condensation causing a periodic sputter, someone else mentioned a little dry-gas solved it...maybe so, peek inside the tank (don't use a match) check all your fittings, watch the fuel-line for bubbles. better one of these than going into the carb. in case you didn't know: the bowl and float is how your fuel is recieved (and stored) by the carb, if there's something wrong in there, it could surely cause a periodic sputtering.

    now, as far as opening the bowl, if you've never, then be very careful to not strip any screws or tear any gaskets, they could possibly be fragile items: all i'd be looking for is obvious sticking or snagging of the float...beyond that, i'd have to be there to be able to advise you on any adjustments, be cautious without sure knowledge.
  14. I took the bottom off the carb-bowl and the float is floating in fuel. I made sure the sparkplug is sparking and I just don't know what to do at this point...

    -EDIT- my dad took the carb apart and found that the pin was sticking because of particle build-up. I put a particulate filter in the fuel line and the engine went for another 40 miles before the CDI went out on me.