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To resist or not to resist?

Discussion in 'XJ Technical Chat' started by MrSeca, Apr 10, 2025.

  1. MrSeca

    MrSeca Active Member

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    Regarding spark plugs and caps I have a Seca 900 and it seems there's conflicting information between the manual and XJ4ever. The manual suggest resistant spark plugs (BPR8ES) and no suggestions for caps. XJ4ever suggests non-resistant plugs (BP8ES) and 5k ohm caps. I'm currently running both resistant plugs (BPR8ES) and caps (5k ohm) and I'm having starting issues. So I have a few questions:

    What's the definitive combination between plugs and caps? Which should contain the resistor?
    What are the pros and cons of using non-resistant plugs AND non-resistant caps together?
    What are the pros and cons of using resistors in both plugs and caps?
    What should be the total sum resistance?

    I'm currently running the original ignition coils which ohm out correctly. Battery is brand new. New air filter. Carbs have been church of cleaned. Also using original jets and emulsion tubes in the carbs. I am getting spark. Checked for leaks. When bike fires up it sounds and runs great.

    Any other pertinent info regarding this topic is welcome. Thanks.

    Mr. Seca
     
    Last edited: Apr 10, 2025
    MrSeca, Apr 10, 2025
    #1
  2. Robert Strumbell

    Robert Strumbell Member

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    Hard starting HOT or COLD? I cant see BP8ES damaging electrical components to just try, if its just cold.
     
    Robert Strumbell, Apr 10, 2025
    #2
  3. MrSeca

    MrSeca Active Member

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    Cold. Starts fine after I warm it up.
     
    MrSeca, Apr 10, 2025
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  4. Robert Strumbell

    Robert Strumbell Member

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    After you try BP8ES, try starting on prime.
     
    Robert Strumbell, Apr 10, 2025
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    MrSeca likes this.

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