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Thread: stick coil loose

  1. #1
    P Monk
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    stick coil loose

    On my new to me 2011 RT, I the spark plug/coil cover pulled a Harley on a ride the other day. I did notice a couple of times where there was a slight miss while accelerating. I find the stick coil backing off the spark plug when the bike warms up. When cool it seems to be nice and tight. The coil backed out so far I am not sure it was even firing the plug. Anyway a new cover has arrived but it doesn't seem right that the coil would back off the plug.
    P. Monk
    74 R90/6 (the Black Hole) Harvey couldn't kill it. . 09 R1200 GS, drowned in Harvey replaced by 2011 R1200RT. Wife, 1953 model survived aplastic anemia and a bone marrow transplant.

  2. #2
    P Monk
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    question about loose coil

    So let's make this a question. Has anyone ever had this happen to them? Is it normal and the cover supposed to keep the coil in place? Or should the coil click on to the sparkplug?
    P. Monk
    74 R90/6 (the Black Hole) Harvey couldn't kill it. . 09 R1200 GS, drowned in Harvey replaced by 2011 R1200RT. Wife, 1953 model survived aplastic anemia and a bone marrow transplant.

  3. #3
    Registered User Woodbutcher's Avatar
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    Coil should stick on plug.
    Rusty
    Austin, TX
    Two Wheeled Texans
    2009 R1200GSA 2013 K1600GT

  4. #4
    not so retired henzilla's Avatar
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    Should feel it click in place. Have not had one come loose if properly seated and don't think the upper cover would keep it in place
    Have found the lower ones loose on occasion and made assumption laying on ground by previous persons visit didn't fully seat before screwing the guard in place.
    I put a bit of moisture on the boots opening and always feel the click
    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

  5. #5
    Quote Originally Posted by dpmonk View Post
    On my new to me 2011 RT, I the spark plug/coil cover pulled a Harley on a ride the other day. I did notice a couple of times where there was a slight miss while accelerating. I find the stick coil backing off the spark plug when the bike warms up. When cool it seems to be nice and tight. The coil backed out so far I am not sure it was even firing the plug. Anyway a new cover has arrived but it doesn't seem right that the coil would back off the plug.
    My 2012 rt did the same thing after i lost the cover in high wind . The cover holds it in place..

  6. #6
    Registered User lkraus's Avatar
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    Quote Originally Posted by Jodyc746 View Post
    My 2012 rt did the same thing after i lost the cover in high wind . The cover holds it in place..
    Perhaps you lost the cover because the coil was not properly seated and prevented proper installation of the cover?

    It should take a pretty strong pull to remove the coil from the spark plug - much more force than needed to remove the decorative cover. The coil is held by a spring metal clip to the spark plug terminal and the rubber boot gripping the porcelain insulator. The cover only has some small plastic tabs.

    Think about it another way - what would be the source of the considerable force that is popping off these covers and coils? Even a loose spark plug will not do it, as the plug and coil area does not have an airtight seal to build pressure.

    My vote is for a coil that was not properly seated.
    Larry
    2006 R1200RT

  7. #7
    Can one of our electrical engineers explain to me the advantages of using stick coils on motorcycles. It seems to me the frequent complaints about loose, broken, or failed stick coils are far more numerous that we ever heard about conventional coils, certainly since the early Airhead days (was it the blue coils or brown coils??).

    What are the technical advantages that subject us to all this stick coil grief?
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  8. #8
    MOA #24991 Pauls1150's Avatar
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    They're small and light in weight; maybe they're easier to manufacture?
    They also eliminate that "high tension" (high voltage) cable that can become intermittent or open.
    ("Hey Bubba, hold my beer while I check for a spark!")
    I've read several times that the BMW cars have had issues with their sticks, too...

  9. #9
    P Monk
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    stick coils

    mainly they are much much much more expensive.

    And I agree that the coils should not be able to back off. I do not feel any spring clicking on the spark plug. Just got new plugs, either the coil will have to be replaced, or maybe someone removed the nut on top of the plug? Right now trying to get my house in a livable condition, but will pull the plug tomorrow to see.
    P. Monk
    74 R90/6 (the Black Hole) Harvey couldn't kill it. . 09 R1200 GS, drowned in Harvey replaced by 2011 R1200RT. Wife, 1953 model survived aplastic anemia and a bone marrow transplant.

  10. #10
    i should be out riding! wyman.winn's Avatar
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    Quote Originally Posted by dpmonk View Post
    So let's make this a question. Has anyone ever had this happen to them? Is it normal and the cover supposed to keep the coil in place? Or should the coil click on to the sparkplug?
    when i service my 13RT and change plugs both the upper and lower stick coils "click" firmly onto the top of the spark plug...the covers, in my view, are only there for aesthetics. mind you, i have changed plus 5 times in the 93,000 miles i have had the RT....i am currently running E3.38 plugs with great success and they also use the "top cap" BUT are 5/8" vs 14mm

    just my 2 cents worth...
    ~wyman~

    2015 BMW S1000R - Duke - Black Storm Metallic
    2013 BMW R1200RT - Sassy - Fluid Grey Metallic

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