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Thread: Need a bigger hole or small socket....

  1. #1
    Registered User Motodan's Avatar
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    Need a bigger hole or small socket....

    Been a while since I'd changed plugs on a Beemer. So on my '08 RT I started with the top plugs. And damn, the 5/8 (16mm) socket was too "wide" to reach plugs. But behold, a second 5/8's in the box did...primary plugs out all good. Now for the down under ones, but the socket used to extract primary plugs will not fit. These two holes are smaller - why? I live in a town with a greater metro area population of over 350,000, but not one thin(ner) wall deep socket available to fit those secondary holes. Had to get the ole grinder out to have a "correct" size socket. I will never figure out "the BMW way".
    F850GSA

    MOA #46783

  2. #2
    P Monk
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    smaller socket needed

    I found that where an 3/8" drive socket was a little too big, a 1/4" one fit just right.
    P. Monk
    74 R90/6 (the Black Hole), 2011 R1200RT.

  3. #3
    Registered User Motodan's Avatar
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    I will look for a 1/4" drive, 5/8's inch (16mm) deep today. I did look at one store earlier, but largest 1/4" drive deep they carried was 12mm.
    F850GSA

    MOA #46783

  4. #4
    Gerard jagarra's Avatar
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    Was there a spark plug socket in your tool kit or was it missing? In some cases I have had to order a tool kit replacement from dealer to find the correct socket that cleared.


    Maybe this one will work https://www.ebay.com/itm/16mm-Spark-...19.m1438.l2649
    Last edited by jagarra; 04-21-2018 at 04:02 PM.
    1994 R1100RS-(5/93)-,1974 R90/6 built 9/73,--1964 Triumph T100--1986 Honda XL600R

  5. #5
    RK Ryder
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    Check out the link below for a recent thread on this topic. It may be your inexpensive solution. Pictures are in post 23.

    Hope this helps.

    https://forums.bmwmoa.org/showthread...head+Sparkplug
    Paul F. Ruffell
    Retired and riding my RTs, the '87 K100 & the '98 R1100 !
    Niagara Riders & Knights of the Roundel #333

  6. #6
    Registered User lkchris's Avatar
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    You can buy the socket from BMW ... special tool.
    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

  7. #7
    Registered User pappy35's Avatar
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    Here's one but it's a little (by this I mean a lot) pricey.

    Camhead Spark Plug Socket

    There are quite a few on Amazon but it's hard to know which one will work for a Camhead. Any of you that have one that works care to measure it (outside diameter, length, and plug size - I think it's 16mm but am not sure). I need to add one to my tool kit.
    '13 R1200RT 90th Anniversary Edition

  8. #8
    Registered User Motodan's Avatar
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    I put the grinder to work and now my "extra" 5/8" deep socket fits/works just fine.
    F850GSA

    MOA #46783

  9. #9
    Registered User barryg's Avatar
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    Access to and ability to use an old school lathe is also a good solution to turn down a socket to a usable size.

  10. #10
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Quote Originally Posted by barryg View Post
    Access to and ability to use an old school lathe is also a good solution to turn down a socket to a usable size.
    Or- even a drill. Chuck the socket up and address with a 10 mill bastard file.
    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
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    2009 F800GS 1994 TW200

  11. #11
    Registered User barryg's Avatar
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    Yep, makes me want to find a machine shop and turn some metal, make some chips, do a little grinding. Ah, the good old days in an old school machine shop. Gotta find my 6" scale, vernier calipers, 0-1' mike, and go to work. Where's my oversized socket, I'll make it fit.

  12. #12
    Ponch ponch1's Avatar
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    Quote Originally Posted by Motodan View Post
    I put the grinder to work and now my "extra" 5/8" deep socket fits/works just fine.
    That's what I did and I use it only for those plugs. I went through about 4 different sockets trying to find one that worked. Then I got the grinder out.
    My Motorrad
    BMWMOA 162849 | BMWRA 41335 | VROC 8109-R | VBA 19

  13. #13
    Registered User
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    Have ground down many sockets in my life due to this problem . Very common on old Triumphs

  14. #14
    Dress for fall & avoid it AlanColes's Avatar
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    This has been a common issue over the years.

    Least expensive way to solve it is as suggested, get a deep 5/8" spark-plug socket turned down. The low torque requirements will mean that the reduction in socket strength is a non-issue.

    Quickest, but most expensive way to solve it is to buy a Snap-on deep 5/8" spark-plug socket. Snap-on and a few other top-tier tool makers are well known for making their sockets out of higher quality steel and using thinner walls on their sockets than the vast majority of offerings.
    https://store.snapon.com/Flank-Drive...s-C629437.aspx
    Regards, Alan - President BMWONS - BMWMOA/BMWRA/BMWONS/Airheads
    Current: 2019 R1250RT / '06 Ducati ST3s / '91 R100GS / '86 R80RT / '75 R90S / '73 850 & '70 750 Commando Prev: '14 R1200RT / '04 R1150RT / '81 Honda GL1100 / '77 Suzuki GS750 / '73 Norton 850 Commando

  15. #15

    Metric Bike requires metric tools...

    14mm thin wall spark plug socket from Amazon... A necessary tool for spark plug replacements... Use the right tool for the job - you won't be frustrated in the end.

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