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Bike dies after about 10 minutes???

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  • Bike dies after about 10 minutes???

    Ok here is a weird one. Went on an overnighter yesterday, bike ran fine up to the campsite, as per usual. Bike always runs fine, has been the most faithful thing going. Got up this morning loaded up the gear, and drove off. After about 10 minutes of riding the bike just died completely, but everything still worked, except for no spark to the plugs. Had lights, horn, turn signals, everything, but no spark.
    Left if for about 20 minutes and it started up again. Altogether this repeated 4 times before we gave up and Phil Murphy drove to Nanaimo and returned with his pick up truck. Of course we quickly removed the Yamaha symbols on the tank and replaced them with Harley ones so no-one would see a Yamaha in a pickup truck. :-)
    In the process of troubleshooting, we cleaned all the plug-in connectors under the tank and seat, checked and replaced the TDI unit, checked the mercury "fallover" switch, disassembled and checked the kill switch, but nothing helped. We removed the side cover and wiggled the pickup wires as well. We're stumped. This thing will run about 10 minutes then shut down with no spark on any of the plugs until it's cool again. This just happened instantly, the bike was dead reliable until this morning. New battery, fully charged too. Any suggestions??? Checked and replaced all the fuses too. What could cause a total loss of spark to the plugs but let everything else work????? Maybe Phil can add to this if I've forgotten something.

    Courtney
    Bone stock 1980 Special except for the exhaust and crashbars. Oh yeah, and the scabbard for the Winchester Defender.

  • #2
    I'd still bet on the pickup coil wires.
    I recently replaced the entire assembly because of similar (strange) problems and haven't had any problems since.
    XS 1100 LG

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    • #3
      Just a shot in the dark?

      How about the ballast resistor? The symptoms sound like when something in the electrical circuit gets hot enough, it expands and totally breaks the circuit. If the ballast resistor is damaged, then when the engine is running, it is in use, but will build up heat as it provides the resistance for the coils. When it gets too hot, it separates completely breaking the circuit=no power getting thru till it cools down and contracts remaking the contact!?!?

      T.C.
      T. C. Gresham
      81SH "Godzilla" . . .1179cc super-rat.
      79SF "The Teacher" . . .basket case!
      History shows again and again,
      How nature points out the folly of men!

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