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Thread: Spark plugs (again) - Dual Spark R1100s

  1. #1
    Left Coast Rider
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    Spark plugs (again) - Dual Spark R1100s

    Attention gurus:

    I believe the Autolite 3923 is the replacement plug of choice for the dual-electrode plug on the R1100S. Which plug do I need in the lower position?

    Thanks in advance for your assistance.

  2. #2
    Registered User lkchris's Avatar
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    It's touted as a replacement on the single-spark versions.

    Are you sure the twin sparklers use the same main plug?

    In any event, the autolite is suggested as a surging fix--dual plugs is the surging fix on those models.
    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

  3. #3
    MOA #24991 Pauls1150's Avatar
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    Hmm, I thought the 1100's used the 3922 (single spark), one range hotter ... can't speak for the dual-plugged 1100's.
    For my 1150's lower plug, I use the NGK DCPR6E (part # 3481), or the iridium version DCPR6-EIX (part # 8196).
    The S has a hotter intake cam and higher compression, so this may not be valid for you.
    The NGK site only calls out the BKR7EKC-N (p/n 2095) for the 1100S, no 2nd spark callout there, and this cross-references back to the 3923 on the Autolite site.
    Useless?

  4. #4
    Left Coast Rider
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    Thanks guys. The bike runs fine, I'm just looking for a cheaper replacement plug.

    I appreciate the input.

  5. #5
    not so retired henzilla's Avatar
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    I use the cheat sheet listings here. Our S is a single spark, so we use 4417's...but I don't want to be accused of a hijack here


    http://www.beemerboneyard.com/sparkplugs.html

    Their suggestion for 11S dualies

    http://www.beemerboneyard.com/12127681415s.html
    Steve Henson
    SABMWRA MOA Club#62's Flat Fixer/ current forum moderator
    It's not the breaths you take, but the moments that take your breath away-D.Dillon/G. Strait

  6. #6
    MOA #24991 Pauls1150's Avatar
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    "The cheapest part of any vehicle is the nut that holds the wheel."

    Per the MAX fiche: Bosch plug number YR6LDE... Just cross-reference that to the other manufacturers.
    Autolite calls out the their 4164 as the replacement.

  7. #7
    Registered User roger 04 rt's Avatar
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    For the lower plug the stock heat range wasn't hot enough for me so I went with a DCPR6E, others have used a DCPR6EIX. Stock lower plug is DCPR8EKC.

    For the center plug the Bosch YR6LDE works fine.

  8. #8
    Left Coast Rider
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    I just spent $14.00 (CDN, including tax ) for 2 - Autolite 3923 and 2 - Autolite 4164 which are the replacements for NGK BKR7EKC-N and the Bosch YR6LDE, respectively.

    If I run into issues, I will report back.

  9. #9
    Registered User roger 04 rt's Avatar
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    The Autolite 4164, if memory serves me correctly, needs an 11/16" socket, that had to be ground thin for the 3/4" near the cylinder head.

  10. #10
    MOA #24991 Pauls1150's Avatar
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    I've never used the 4164; but I agree that the NGK "6" heat range gives me a better-lookin' plug than than the "8".

  11. #11
    Left Coast Rider
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    Quote Originally Posted by roger 04 rt View Post
    The Autolite 4164, if memory serves me correctly, needs an 11/16" socket, that had to be ground thin for the 3/4" near the cylinder head.
    You, sir, are correct (as usual).

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