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Please help

Discussion in 'XJ Technical Chat' started by Michael travis, Oct 26, 2019.

  1. Michael travis

    Michael travis New Member

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    Hello all, I have a 83 xj650 maxim, and here is my road bound blocker, I am not getting spark on outer plug on the left side, except a little one when i let off the start button. Can this be caused by the kill switch/start button box on the right side of handle bars? Thanks for any help.
     
  2. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    If you have spark on the other plugs then the kill switch is not at fault.

    Unscrew the plug cap from the wire (lefty losey) and check for corrosion in the wire. If you find any just cut the wire back a bit and reinstall the plug cap).
     
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  3. Jetfixer

    Jetfixer Well-Known Member

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    The caps can break down, I went to my local Yamaha dealer and bought all 4 they had the proper position the inner are different from outboard , less than 20$
     
  4. Michael travis

    Michael travis New Member

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    Thank you is there a way to test it the plug caps to see If they are bad because the just put two brand new coils on but they did not come with caps so I am using the old ones
     
  5. Rooster53

    Rooster53 Well-Known Member Premium Member

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    Spark when releasing the start button usually indicates an issue with low voltage to the primary side of the ignition coils making the already weak spark almost non-existent. More times than not the battery is at fault, but poor electrics such as the fuse box, dirty switches, or poor contact at connectors because of corrosion are also possibilities.

    You can use a meter to test the plug caps

    https://www.xjbikes.com/forums/threads/the-information-overload-hour.27544/

    Ignition Coils:

    Primary side (input from main wiring harness):
    2.5 ohms +/- 10% = 2.25 ohms - 2.75 ohms acceptable range

    Secondary side (spark plug wires, without their end caps):
    11K ohms +/- 20% = 8,800 ohms - 13,200 ohms acceptable range

    Spark plug caps:
    5K +/- 20% = 4,000 to 6,000 ohms per cap acceptable range

    Spark plugs:
    0 ohms per plug

    Also from the information overload hour - you can search those key words "almost started" for further explanation

    "* "There were a few times when I cranked it, that it ALMOST started. It would start to fire immediately as I let off the start button. But it just wouldn't catch."
     
  6. Michael travis

    Michael travis New Member

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    Where can I get the plug ends for the wires that go in to the tci and other random plug ends2
     
  7. XJ550H

    XJ550H Well-Known Member Premium Member

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  8. Michael travis

    Michael travis New Member

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    Ok thank you for all the help but now I need to know what order the plug wires from the coils to the plug is please thank you
     
  9. Michael travis

    Michael travis New Member

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    Also if I want to bypass the run/stop switch what would I need to do wire wise?
     
  10. XJ550H

    XJ550H Well-Known Member Premium Member

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    left coil cylinder 1 and 4 right coil cylinders 2 and 3 .
    why would you want to do that to your run/kill switch?

    on the harness of the right control there should be 2 red/white wires or red/yellow wires you could follow them back to main harness then remove the wires and put a jumper across the connector to mate with r/w wires wires in main harness. or just cut them and solder them together on the control harness side
    xj650run.PNG
     
  11. Michael travis

    Michael travis New Member

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    You ask why well I think it might not be letting my bike start plus now ever couple of pushes of the start button it stops working and I have to flip the switch off and back on for it to work a couple me time and then do it again. I am so lost on my bike I fear I might need a hole new wiring harness. I hope not but I just can't find why my 1 and 4 are not getting spark.
     
  12. Polock

    Polock Well-Known Member

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    might be time to take the ignition switch apart. the electrical part can be cleaned without getting into the key part
     
  13. XJ550H

    XJ550H Well-Known Member Premium Member

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  14. GREGORY Williams

    GREGORY Williams New Member

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    You said your #1 & #4 plugs have no spark? Do #2 & #3 have spark?
    If 2 do and 2 don't, you have one bad ignition coil, or cables / plugs are connected wrong.

    MAPBOY IN nc
     

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