Need a little help..

Discussion in 'Motorized Bicycle General Discussion' started by OceanBUcks, Sep 20, 2011.

  1. OceanBUcks

    OceanBUcks New Member

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    I finished building my motor bike and I was very excited until it failed to start. I held the gas in and when i released the clutch to engage the engine i heard the engine try to start and fail. The gas line line is fine and there is a switch on the clutch with 2 chinese symbols, i have tried both. Also i dont know if the spark plug is working as i havent put any batteries anywhere. All help is APPRECIATED. Thanks :)
     
  2. Al.Fisherman

    Al.Fisherman New Member

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    1. What are we working on.
    2. If you haven't even tested the plug for fire, why even ask? What has batteries have to do with it?
    3. Switch on clutch..????? Beats me.
    4. If you spray some carb cleaner in the carb, and try to start, that will help you, if its electrical or something else.
     
  3. OceanBUcks

    OceanBUcks New Member

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    I meant switch on the carborator, im workng on a crappy chinese kit, i dont hve any carb cleaner. How do i test the plug?
     
  4. 2door

    2door Moderator
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    Remove the spark plug, re-attach the plug wire then hold the plug firmly against the cylinder head. With the clutch engaged, roll the bike forward at a fast walk or spin the pedals with the rear wheel elevated and watch for a spark at the plug's electrodes ( bottom of the plug where the 'L' shaped part is) If no spark then start by checking the wiring connections. The kit supplied plug-in connectors are notorious for making bad contact. We always suggest those connections, blue to blue and black to black, be soldered and not rely on the brass plug in style of splice.
    There are no batteries involved. Ignition current is supplied by a voltage generating device called a magneto and that current is increased by the ignition module we call a CDI (small black box that has three wires, blue, black and spark plug wire)

    The choke lever on the carburetor should be down for normal running (the Chinese symbols mean open and closed or on and off) but can be moved up to help in starting a cold engine but should be moved down after the engine starts and runs for a few moments.
    Let us know what you find. There are other things we can suggest to get you running.
    Tom
     
  5. OceanBUcks

    OceanBUcks New Member

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    Thanks a ton, il try that tomorrow and tell you how it goes. Great forum here:).shft.
     
  6. OceanBUcks

    OceanBUcks New Member

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    Tested the plug, and there is NO spark. How do i fix this?
     
  7. Al.Fisherman

    Al.Fisherman New Member

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    1. Disconnect the kill switch...test.. leave it off for now
    2. Check that the white wire from the mag isn't grounding out. Cut it off, no need for it.
    3, Check the connection from the mad to CDI. Make sure good connection.
    4. Test mad output. Small volt meter will work, or make a test light out os a instrument bulb. No fire bad mag,
    5. Fire, bad CDI.

    One thing I always tell folks is to check engine timing.
    Magnetto pictures by Ron-Becker - Photobucket
     
  8. OceanBUcks

    OceanBUcks New Member

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    got it fired up, ran for about 10 mins then the thing that adds tension to the chain broke, Should i keep that on or just take it off and tighten the chain?
     
  9. Al.Fisherman

    Al.Fisherman New Member

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    Tighten your chain but leave about 1/2" slack, you don't want it over tighten it. Many members don't run a chain pensioner. I do.
     

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