electrical,computer cut out with evey start

Discussion in '2-Stroke Engines' started by dave1490, May 23, 2007.

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  1. dave1490

    dave1490 Guest

    just got a new computer to monitor speed,works fine scan,s fine.but when the motor starts the computer reset,s.any ideas?thanks

  2. iRide Customs

    iRide Customs Member

    Are the wires close to or tied to the wires coming out of the engine? Is you bttery tight? Maybe the engine vibrating is just enough to loosen the battery connection in your computer...maybe?

  3. gone_fishin

    gone_fishin Guest

  4. motorbicycle

    motorbicycle Guest

    the same thing happened to me, i think it might have to do with the spark plug. Some snow blower plugs can interfer with tv signals so maybe the same goes for your cycle computer. Try a new plug, i think they make ones with out rf interferance, i dont know. It could also be that your computer wires are too close to the ignition wires?
  5. dave1490

    dave1490 Guest

    thanks i,ll try the suppreser
  6. Guest

    Guest Guest

    Resistor plug. It will cut down on the spark a bit, but if you must, test.
  7. dave1490

    dave1490 Guest

    just to let you know for people with similar problems,those clip-on rf\emi filters realy do work my computer works as it should with no problems.thanks to all
  8. happycheapskate

    happycheapskate Active Member

    Are you talking about using "fuel magnet" on the spark plug wire?


    I searched for "clip on RF Filter" and got these, which look exactly like the "MIT designed magnetic fuel activators" I got from a catalog for $10 each

    I don't know if they increase fuel mileage, but I suspect they would stop any metal flakes before they reached the filter or engine.

    I used to have no problems with my cyclo computer, but lately its reset every ride. I tried a new battery but it still happens, so I am thinking that the new wire routing (the traditional spiral around the handlebar and brake cable to the sensor) is exposing it to more to the spark wire radio interference.

    I'm going to try unspiralling it and wrapping the wire in electrical tape.
    Then if I have to, I 'll try putting a "fuel magnet" on the spark plug wire.
  9. motorpsycho

    motorpsycho Active Member

    it's r.f. interference from the ignition on the motor.
    there is nothing you can do about it exept get a better speedometer.
    you can try to shield the computer (speedo) by isolating it from touching anything metal by putting a peice of ruber between it and where it's mounted.
    you can try using a sheilded spark plug wire (or a resistor plug wire)...but seriously i went through all of the suggestions and nothing worked.
    go to wal mart, and buy yourself a $10.00 schwinn compter/speedometer...it'll work just fine.
    you should replace the stock spark plug wire anyway, because it isn't a real spark plug wire...it's just a peice of thin wire wrapped in rubber sheath.
  10. happycheapskate

    happycheapskate Active Member

    I have the red $10 Schwinn Walmart computer. I used electrical tape instead of rubber to keep it from turning on the bars. I put the magnet on the sensor wire, right next to the computer, with one wrap to keep it from moving. So far so good. It didn't reset today.
  11. happycheapskate

    happycheapskate Active Member

    Well, poop. It reset again today, twice. I am going to try unwrapping the wire from the brake cable and putting either rubber tube or tape on it, and putting the computer on the bar over a piece of tube. This is getting old. I don't want to spring for a "nice" computer either, bc. it seems this happens to them just as easily, from other threads.

    Someone mentioned that the stock plug wires suck too. I guess I'll wrap it with something till I can order or buy an improved piece/part.
  12. happycheapskate

    happycheapskate Active Member

    Maybe we're getting somewhere


    This user says the resetting may be caused by either a defective Cycle Computer (CCP) or because of vibration causing a loose connection at the nubs where it mounts to the sensor wire bracket.

    I'm going to put Dielectric Grease (bulb grease) on those points and see if that cures it.
    I thought about gluing the booger, but then I couldn't change the battery. UGH. Someone should make a backlit, silicone band mounted CCP that doesn't have the removeable module (battery in back, un strap it from bike to change).
  13. happycheapskate

    happycheapskate Active Member

    Do any of you have problems with GPS's from the motor interference? I haven't tried that yet but I'm mounting my GPS to the bike soon.