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NGK BPR5ES vs HD 5R6APP

Discussion in 'Technical' started by jbboxer, Nov 15, 2008.

  1. jbboxer

    jbboxer Member

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    My Bike(s):
    2001 Bigdog Boxer
    My 01 107ci originally had Harley 5R6APP plugs. The NGK site says to use BPR5ES. The HD plugs have a slightly longer reach. What will the effects be of using a shorter plug. Is either more prone to fouling?
     
  2. lee

    lee Well-Known Member

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    2005 Big Dog custom build and Buell custom build
    I guess using a shorter reach plug won't do damage but may not run properly - that is assuming the HD plugs you had in there were the right length. Use the plugs that are recommended.
     
  3. roedog

    roedog Member

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    Spark Plug Reference

    JBBOXER,

    I just installed a set of the NGK BPR5ES-11 plugs in my 2003 107 motor, seems ok. I have been running the stock Champion RN12YC.
    Here's a link to spark plug reference, kinda nice to have.
    Plus website has some interesting reading material.

    Spark Plug Interchange Guide

    Spark Plugs for
    80 CID Evolution Engine
    Plug Manufacturer 80 CID Evolution 1984-up
    Plug Gap .040"
    H-D Standard 5R6A
    H-D Gold 5R6AG
    H-D Platinum 5R6APP
    Champion RN12YC
    Autolite 4265
    Autolite Platinum AP4265DP2
    ACCEL 2410A
    Splitfire SF6D
    Screamin Eagle EVS13S - Hot
    EVS13P - Cold
    ACDelco 44NS
    NGK BPR5ES-11
    NGK Platinum BPR5EVX-11
    Bosch WR8D
    WR8DC
    WR8DP
    Denso Iridium IW16


    Enjoy,
    Roedog
     
  4. John Chiarenza

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    John
    Great list! Thanks for the efforts. I'll stick to the Champion RN12YC's.
     
  5. John Chiarenza

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    John
    When I was younger, there were only a few spark plugs to choose from (Champion AC Delco, Autolite). I have always stuck with Champions for older cars mostly from habit (and price!).
     
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  6. BWG56

    BWG56 Guru

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    X2 here also, new set in the Dog every year, $3
     
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