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  1. #1 TXM's Electrical fault? 
    C-Moto Senior
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    Hello
    Now I’m having the following problem. After I increase the throttle lets say above 70% my bike acts like if it has a rev limiter or current limiter let’s say.It just coughs and sputters. I found that the contacts that are inside the connector (bosh type) that join the ignition coil to the CDI are sulfated (green, whitish); I discovered that after cleaning them I can start the bike quicker. Now I think that the problem when I give full throttle could be something related to this or the CDI. It’s similar also to a poor (lean) mixture, but I think it’s more electrical.
    What do you think? Any thoughts?
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  2. #2  
    Honorary C-Moto Guru
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    It doesn't sound like the rev-limiter, if one is fitted. The rev limiter is set very high, 1000 or more rpm above the max power revs.
    Bad connections could cause it as well as a bad spark plug. Do you still have the original Chinese plug fitted?. If so change it to an NGK and your problem will go away and the bike will run a lot better.
    Jincheng Monkey JC50Q-7
    Skyteam Dax replica ST110-6
    Zongshen ZS125-43
    Qingqi QM200GY-BA Super Motard
    Qingqi QM110GY
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  3. #3  
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    I still have the original,but I believe that is a NGK,I'll check and I'll tell you .
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  4. #4  
    Administrator-tron CrazyCarl's Avatar
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    Vaccume leaks can cause strange running at high RPM. Also a clogged/dirty jet in the carbs.

    What does your spark plug look like?

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  5. #5  
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    I changed all the Bosch type terminals,they were sulfated and I think they were made of a cheaper alloy or cooper,the ones I put now are made of a harder alloy,I think a huge percent of bronce if they are not 100%. I sealed the whole switch that encapsulates de terminals with 3m auto-soldering tape,and the bike seams to be ok now.
    I'll check the vacumm leaks you told me too and the jetting since I know they can give trouble.
    One thing i noticed is that inside a cable I mean lets say the 30% of the filaments are brown or black ,should i replace that cable?I think its the trigger for the cdi pulse or the +12V.
    I'll keep you informed.
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  6. #6  
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    The discoloration of the cable strands should not affect the cable resistance or its current carrying capacity. However bad connections specially in the pulser circuit wire are bad. The pulser only produces a very weak signal, 0.6 volts or so. Any resistance in this wire or connector will affect the ignition.
    Jincheng Monkey JC50Q-7
    Skyteam Dax replica ST110-6
    Zongshen ZS125-43
    Qingqi QM200GY-BA Super Motard
    Qingqi QM110GY
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  7. #7  
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    Which could be the cause of the discoloration?
    Just in case I've to change the cable at both sides, can I change the engine side cable? I mean the one it comes from the engine? Or should I change the whole alternator?
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  8. #8  
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    Poor quality cable. The tinned finish is below standard and the plastic insulating cover is not tight-fitting allowing water and road contaminants to corrode the strands.
    This is assuming they even used tin-plated wire in the cables. If the strands are not even tinned then copper quickly corrodes.

    The end of the cable on the engine side is probably soldered inside the final insulating tape layer of the coil, and this would mean undoing that layer. The cure could be worse than the illness. I wouldn't do it.
    Jincheng Monkey JC50Q-7
    Skyteam Dax replica ST110-6
    Zongshen ZS125-43
    Qingqi QM200GY-BA Super Motard
    Qingqi QM110GY
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  9. #9  
    C-Moto Senior
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    Oh OK.I see.
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  10. #10 Neutral switch 
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    Now I wonder how its made the electrical contact inside the engine when I put neutral with my shift lever? Is it like a switch that when I put the lever in neutral activates and gives ground to the CDI?
    Do you have any picture of that assembly?
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