Electrical problems-no spark

Discussion in 'Motorized Bicycle General Discussion' started by Monosapio, Jul 16, 2010.

  1. Monosapio

    Monosapio New Member

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    Wondering if anyone can give a breakdown of the electric components or a way to test the ignition coil. Bought a new one and having trouble. Why would the solenoid or cdi starter become defective?
    Thanks for any help.
     
  2. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    What tests have you done to think the CDI or mag-coil are defective?
     
  3. Goat Herder

    Goat Herder Gutter Rider

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    Disconnect the kill switch and give it a go.


    CDI pack GOOD Mine
    Black to Blue 1150kΩ 7.6 meg Ω
    Black to Plug 2.6kΩ 2.17K Ω
    Blue to Plug 1150kΩ OPEN


    Magneto
    Blue to White 327Ω 349Ω
    Black to Blue 327Ω 347Ω
    Black to White 2.1Ω 2.1Ω
    Black to Gnd 0Ω 0.3Ω
    Blue to Gnd 327Ω 347Ω
    White to Gnd 2.1Ω 2.3Ω

    Origanaly posted by Fairracing. This should help. I am not sure where the sticky is at the moment.
     

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  4. Monosapio

    Monosapio New Member

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    I have made sure the carb was cleaned and adjusted throttle and air intake, pulled out plug to look for spark while pedaling, drained tank and saw all lines working. Also fresh gas with 20:1 oil mix. I don't run a kill switch.
     
  5. Creative Engineering

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    Sooo...the bike was running? And now you have no spark?

    Or, is this your first build...and you have yet to get it running?

    Jim
     
  6. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    When you pulled the plug to check for spark while pedaling, did you ALSO touch the threads of the plud to the head to ground it while pedaling??? (very important!!!)
     
  7. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Did you check the plug "boot" or cap? They come apart internally on occasion.
    Is the wire screwed down tight into the CDI?
    All connections tight (including the ones inside the case)?
     
  8. Goat Herder

    Goat Herder Gutter Rider

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    Oops it just dawned on me I don't even know if he has a china 2 stroke?:oops: That's what that ohm chart and diagram is for.
     
  9. Monosapio

    Monosapio New Member

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    Thanks for the posts. This bike has run with this motor for a few years. It is a china twostroke. I did make sure to ground the plug with a bungee. How do I check these connections I should tighten and how do I get INside the case? This is a new replacement piece so the cap boot is fine. The bike has been outside exposed to heat for the last four months.
     
  10. DVBikes

    DVBikes New Member

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    Change the spark plug i have noticed that people tend to crack them and they wont spark ive had. i few neibors that i have fixed and it blew my mind why there was no spark. and it was the plug try getting a new one and let me know
     
  11. Monosapio

    Monosapio New Member

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    The one I am using is new and has never fired. I adjusted it between .2 to .28, and have kept it there
     
  12. Goat Herder

    Goat Herder Gutter Rider

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    Even new plugs can come cracked a hair line fracture in the insulation will doom it. Do cross you P's and Q's with the simplest stuff first.
     
  13. Monosapio

    Monosapio New Member

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    I'll give it a try. Nothing else is making sense.
     

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