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81 XJ650 - Runs with resistive spark plugs?

Discussion in 'XJ Technical Chat' started by Tristan Kernick, Mar 8, 2025 at 6:48 PM.

  1. Tristan Kernick

    Tristan Kernick Member

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    Second thread for today, racking up those internet points. Recently ordered some new spark plugs from Len, since I have no maintenance history for my 81 XJ650 Maxim and figured the ones in the cylinders might be original.

    Len sent me the stock non-resistive plugs, NGK BP7ES. After some twists and turns through the post office, they arrived and I set about replacing mine. And yet.. lo and behold, mine are BPR7ES, the resistive variety. I’m 99% sure my bike has stock coils and plug wires too… plug wires hard-wired to the coils, and the wires are numbered 1 through 4.

    So, what’s the deal here? Bike seems to run fine. Can it run with resistive plugs in resistive wires? Or does it have aftermarket ignition without my knowledge?
     
    Tristan Kernick, Mar 8, 2025 at 6:48 PM
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  2. Tristan Kernick

    Tristan Kernick Member

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    I installed the non-resistive plugs today and took her out for a ride. I experienced basically no difference. Also took a picture of the coils while I had the tank off. Certainly looks stock to me…

    IMG_7984.jpeg
     
    Tristan Kernick, Mar 9, 2025 at 10:53 AM
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