Pick up coil

Discussion in 'How To Guides' started by aquaant03, May 17, 2020.

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  1. May 17, 2020 #1

    aquaant03

    aquaant03

    aquaant03

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    Hi,
    Bikes been running fine but now no spark, I've removed the pickup coil and have no resistance measurement at all.
    I assume its knackered?

    Does anyone have a good single coil or know where to get one from?

    Regards
    Tony
     
  2. May 17, 2020 #2

    Fire-medic

    Fire-medic

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  3. May 18, 2020 #3

    aquaant03

    aquaant03

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    Hi it's the single coil, although I bought it as an 89 from DK.
    Interestingly the wires had been spliced previously, I cut and reconnected them and I got a resistance measure, I then warmed it as I had seen on you tube and no measurement, it cooled and came back.
    I have seen that the xvz1300 coil is the same, si I've worded it from DK, just hope it works?
     
  4. May 18, 2020 #4

    Fire-medic

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    Loss of continuity when hot is a common problem with the VMax pick-up coil if it's bad.

    How-many wires do you have for your pick-up coil? The early 1985-'89 has 5 wires in a six-wire M-F nylon connector block. The 1990-'07 has two wires in a two-wire M-F connector. The rotor has to be changed if you're going to convert an early ignition to the later ignition, the CDI box too.
     
    Last edited: May 23, 2020
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  5. May 18, 2020 #5

    aquaant03

    aquaant03

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    Hi,
    Its 2 wires.
     
  6. May 18, 2020 #6

    Fire-medic

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    See this.

    VMax early pick-up coil 1985-89.jpg VMax late pick-up coil 1990-up.jpg
     
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  7. May 23, 2020 #7

    aquaant03

    aquaant03

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    Hi,
    Is the pic for a pre 1990 bike?
    Anyway the XVZ1300 coil has arrived and it measures 211ohms?
    Fitted it and it still wont start but backfires, I've now ordered a new OEM old stock coil, hope that sorts it?
     
  8. May 23, 2020 #8

    Fire-medic

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    A dime to a dollar, I bet you have crossed the coil connectors. In front, the right coil fires the left cyl, the left coil fires the right cylinder.

    OK, look at the first pic, how-many wires do you see to the molex plug? Answer: Five (85-89 ignition) There are five wires into a six-space white nylon plug.

    How-many wires for the pick-up coil to the molex plug in the second picture? Answer: Two (1990-2007)

    Please read the masking tape labels, that's why they're labelled.

    I am not an electrical engineer, that would be my beloved wife (over 40 years as an E.E.) but I suspect that presenting an electrical resistance nearly-twice what the OEM stock ignition box is expecting to-read, is going to cause problems, if not now, when you try to use that Venture pick-up coil, then later. If you choose to use an incorrect electrical component, do-not be surprised when your electronic ignition box greets-you with wisps of white smoke, an acrid unpleasant smell, and a rapidly-overheated plastic case!
     
    Last edited: May 23, 2020
  9. May 24, 2020 #9

    aquaant03

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    Thank you for the clarification , I considered the XVZ coil after looking at the following site
    https://www.hpi.be/pickup.php

    The bottom coil listed is for both the Vmax and XVZ, their resistance measurement table shows 100 ohms, the one I bought is double which must mean its shot, I'll send it back to DK.

    Ref your pics, I understand that now, as I stated earlier mine is the 2 wire one, and the only connectors that I disconnected were to the 2 rear ignition coils and the pick up coil, so I know I haven't mixed them up?
     
  10. May 24, 2020 #10

    Fire-medic

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    P4901 74mm 13mm 3mm 100Ω

    That's what you have but the resistance reads 200+ ohms? That's out-of-spec. It's not that it's 'shot,' it's just not what your needs are. Are you using a better-quality digital multimeter?

    Yes you said yours is the 2-wire, for 1990-2007. What is the serial # on your engine case? What year is your machine, from the info on the steering head?
     
  11. Jun 3, 2020 #11

    aquaant03

    aquaant03

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    Hi,
    I've now fitted a new OEM pick up and she fired up 1st press.
    I've another problem
    I bought the bike from DK motorcycles as a running Japanese import, it did run but not be very well, I balanced the carbs and it sat for 6 months, then I had the pick up coil problem, but it's still got a misfire.
    You mentioned earlier that may be the ignition coil wiring was mixed up?
    I have not taken the front connectors apart before, but that's not to day they are right?
    In my Haynes manual it doesnt show you which wiring goes to which cylinder coil, any idea?
    Connector colours are red and white and then 4 different colours, grey, white, orange and yellow.
    Can you help with this please?

    Regards
    Tony
     
  12. Jun 3, 2020 #12

    Fire-medic

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    If the coil connectors were swapped left for right in either the front or the back the engine would probably backfire constantly and run only intermittently. If it's starting and running but is breaking up on the low end of the tach it's probably clogged pilot Jets and the carb jet block.
     

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