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Thread: Spark Plug numbering

  1. #1
    HOTTECH
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    Concord,N.C.
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    Spark Plug numbering

    My Haynes manual states that the boxer takes a NGK DCPR8EKC but when I ordered a set I was sent a pair of NGK DCPR8E. What does the KC stand for ?

  2. #2
    MOA #24991 Pauls1150's Avatar
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    made in Kansas City... nah! see chart below, two-electrode and "special construction".

    1150RT CENTER
    NGK BKR7EKC-N (part # 2095) [I believe the 1100's use one step different]
    Thread size = 14 millimeter; 5/8" (16 mm) hex (ISO type);
    Resistor; (heat range); Reach = 19 mm (3/4");
    two ground electrodes, low angle, special side

    1150RT LOWER
    NGK DCPR6E (part # 3481)
    Thread size = 12 millimeter; 5/8" (16 mm) hex;
    Projected insulator; Resistor; (heat range);
    Reach = 19 mm (3/4")

    Iridiums
    Primary = BKR7-EIX NGK # 2667
    Secondary = DCPR6-EIX NGK # 8196
    Attached Images Attached Images

  3. #3
    Day Dreaming ... happy wanderer's Avatar
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    Quote Originally Posted by Pauls1150 View Post
    made in Kansas City... nah! see chart below, two-electrode and "special construction".

    1150RT CENTER
    NGK BKR7EKC-N (part # 2095) [I believe the 1100's use one step different]

    Nah! The 1100's use Autolite 3923! Or AP 3923 if you want fancy.

    Seriously though, I was surprised at how well these cheap and widely available single electrode plugs work in the R259 engines. Two bucks a plug and they work better than the $12 Bosch OEM plugs. Go figure!
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  4. #4
    MOA #24991 Pauls1150's Avatar
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    Yes, the AP3923 worked great in my 1100, but Hottech was asking about NGK plugs, so that's what I responded to. His profile also shows him on an 1150, and the plugs are different.

  5. #5
    Registered User
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    The best 1150 plug I have used is the Bosch 4417

    Rod

  6. #6
    Registered User lkchris's Avatar
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    Hottech's profile indicates he has an '04 R1150R ...

    Realoem says plugs for this bike are

    NGK BKR7EKC for the main plugs (14mm)
    and
    Bosch YR6LDE for the secondary plugs (12mm)

    The posted chart indicates "K" denotes dual electrode and I'd think that if the K is missing the plug isn't dual electrode.

    Not for a nanosecond would I follow a Haynes manual specification. Rather start with the BMW specification, which is what realoem provides.
    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

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