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Thread: 2008 R12RT - changing lower spark plugs

  1. #1
    Kindly curmudgeon W7lej1's Avatar
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    2008 R12RT - changing lower spark plugs

    Hi All,

    This has probably been previously discussed and I just missed it.

    Can anyone point me to a suitable thin-wall socket (it would seem, VERY thin-wall) for extracting and installing the lower spark plugs? My Craftsman deep socket walls didn't look very thick, but wowsers, that's tight in there.

    Thanks for any suggestions and guidance.

    Marty
    Marty in Spokane Valley, WA

    '79 R65 - the rolling running project bike
    '08 R12RT - "new scoot"

  2. #2
    not so retired henzilla's Avatar
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    Hey Marty,
    try this thread, I have collected a few thru the years, some fit, some have been ground down

    http://forums.bmwmoa.org/showthread....rk+plug+socket
    Steve Henson-Mod Team and SABMWRA Prez

    Be decisive, right or wrong.The road of life is paved with
    flat squirrels who couldn't make a decision~unknown

  3. #3
    Kindly curmudgeon W7lej1's Avatar
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    Quote Originally Posted by henzilla View Post
    Hey Marty,
    try this thread, I have collected a few thru the years, some fit, some have been ground down

    http://forums.bmwmoa.org/showthread....rk+plug+socket
    Thanks, Steve!

    Marty
    Marty in Spokane Valley, WA

    '79 R65 - the rolling running project bike
    '08 R12RT - "new scoot"

  4. #4
    Registered User David13's Avatar
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    Your best bet is to grind one down.
    They may read "thin" or anything like that. The ad may say really thin or ultra thin.
    But once you get one stuck in there they can be very hard to get out.
    So I think grinding is the easiest.
    dc

  5. #5
    Ponch ponch1's Avatar
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    Quote Originally Posted by David13 View Post
    Your best bet is to grind one down.
    They may read "thin" or anything like that. The ad may say really thin or ultra thin.
    But once you get one stuck in there they can be very hard to get out.
    So I think grinding is the easiest.
    dc
    That's what I did. Works fine now.
    My Motorrad
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  6. #6
    Registered User lkchris's Avatar
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    The BMW special tool works really well.
    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

  7. #7
    Still plays with trains. tinytrains's Avatar
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    Is the bottom plug well tighter than the top one?

    I have pulled the top plugs with no problem, but have not tried pulling the bottom ones yet.

    Thanks
    Scott
    2009 R1200R Roadster

  8. #8
    Registered User AntonLargiader's Avatar
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    The BMW shop tool works best. It is very thin, has retention, and is long enough to work without any extension. I wish BMW sold one like this for the newer engines.

    The Snap-On socket fits well also. Only use it with a locking extension (same with any socket IMO).

    The old 1100/1150 toolkit tool works well, too. No retention, though.
    Anton Largiader 72724
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  9. #9
    Registered User Dann's Avatar
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    I have an ITC 16mm deep socket that works perfectly for both spark plugs on my 07 RT

    I never noticed that the top and bottom ones were different.
    Daniel
    If you can park it, and not turn around to admire it before walking away, you bought the wrong one.
    2007 R1200RT - IBA # 56396

  10. #10
    Registered User lkchris's Avatar
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    Quote Originally Posted by Dann View Post
    I have an ITC 16mm deep socket that works perfectly for both spark plugs on my 07 RT

    I never noticed that the top and bottom ones were different.
    The spark plugs are not different. Just less clearance around the lower ones.
    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

  11. #11
    Registered User Dann's Avatar
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    Quote Originally Posted by lkchris View Post
    The spark plugs are not different. Just less clearance around the lower ones.
    That's what I meant...
    Daniel
    If you can park it, and not turn around to admire it before walking away, you bought the wrong one.
    2007 R1200RT - IBA # 56396

  12. #12
    Registered User AntonLargiader's Avatar
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    FWIW the BMW 12 3 510 tool (83 30 0 401 695) is 20.5mm diameter. The Snap-On 5/8 spark plug socket (S9706KRA) is 21.15mm. The BMW toolkit tool from the R11xx era (71 11 2 316 193) is about 21.2mm. I haven't seen the toolkit tool that was made available for the Hexheads, but it is different.
    Anton Largiader 72724
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  13. #13
    Registered User AntonLargiader's Avatar
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    And, as an anecdote, a customer brought me a TwinSpark 1150 into which someone had installed 11/16" plugs in the bottom. I turned an 11/16 spark plug socket down to 21.85mm (there was 0.75mm wall thickness left at the corners) and it would just go in far enough to get the plug out but it would not slide in.

    If you want to turn down your own socket, or buy one, I'd make sure it was no more than about 21.2mm based on the numbers I posted a few minutes ago.
    Anton Largiader 72724
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    Virginia Motorrad Werkstatt BMW motorcycle service and repair in central Virginia

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