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Thread: 2001 R1100S 2 second knock/noise at start-up

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    2001 R1100S 2 second knock/noise at start-up

    Is it 'normal' to have a couple of seconds of knock/noise when engine first starts? I honestly don't know if it's always been there and I'm just now hearing, or if it's something new… thanks for any comments

  2. #2
    Very common defect but not "normal". Bad left-side cam chain tensioner. There is an upgrade available. See Rubber Chicken Racing Garage web site for more information.
    Paul Glaves - "Big Bend", Texas U.S.A
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    Pepperfool GSAddict's Avatar
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    Ufda happens..........

    Need your R11xx Hall sensor rewired? PM me.

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    Registered User m_stock10506's Avatar
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    Michael Stock, Trinity, NC
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    not so retired henzilla's Avatar
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    Welcometo the forum iselin

    Think the fellas pointed you in the correct direction...post a pic of that S at the top of Oilheads, it drives the RS guys
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    Left Coast Rider
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    Quote Originally Posted by henzilla View Post
    ...post a pic of that S at the top of Oilheads, it drives the RS guys
    And justifiably so!

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    Day Dreaming ... happy wanderer's Avatar
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    Quote Originally Posted by iselin View Post
    Is it 'normal' to have a couple of seconds of knock/noise when engine first starts? I honestly don't know if it's always been there and I'm just now hearing, or if it's something new… thanks for any comments
    The left side tensioner that came with your bike has been superceded by a new one which is identical to the part used on the R1200 engines. In the old ones the oil leaks out when the engine stops. The new one retains the oil so there is no "knocking" on startup. The sound you hear is actually the cam chain slapping since it is loose until the old tensioner fills with oil and starts pushing on the chain like it's supposed to. The original tensioner causes premature wear of the cam chain and guide. Not good!

    Any BMW dealer will have this part available as well as Tom Cutter at the Rubber Chicken Racing Garage.

    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

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    Quote Originally Posted by happy wanderer View Post
    The left side tensioner that came with your bike has been superceded by a new one which is identical to the part used on the R1200 engines. In the old ones the oil leaks out when the engine stops. The new one retains the oil so there is no "knocking" on startup. The sound you hear is actually the cam chain slapping since it is loose until the old tensioner fills with oil and starts pushing on the chain like it's supposed to. The original tensioner causes premature wear of the cam chain and guide. Not good!

    Any BMW dealer will have this part available as well as Tom Cutter at the Rubber Chicken Racing Garage.

    Thanks so much for this information…I'll give it a try

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    Thanks to all for the input…I'll give the new left side tensioner a try

    Really appreciate the input, I think I'll give the new left side tensioner a try

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    Left Coast Rider
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    Quote Originally Posted by iselin View Post
    Really appreciate the input, I think I'll give the new left side tensioner a try
    Having posted the same question myself about 4 years ago, odds are 10 to 1 that this is the problem.

    Don't forget to report back. And don't forget to post a picture of your S!

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    Aspiring Profligate Jeff488's Avatar
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    Here's Tom's site.
    He's a good asset to our band of bikers.

    http://rubberchickenracinggarage.com/chain.html
    '08 BMW R1200RT
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    Looking for Ed Sanders' Truck Stop.

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    Registered User lkchris's Avatar
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    You identify if you already have the upgraded tensioner by noting the size of the hex nut welded to the tensioner. 17 mm = the original, 15 mm = the upgraded version.

    That said, I've had an upgraded version completely frozen in place, i.e. unable to adjust any tension. And, I still have the startup knocking. Have replaced right side tensioner as well. Still investigating.
    Kent Christensen
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    Day Dreaming ... happy wanderer's Avatar
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    Quote Originally Posted by lkchris View Post
    You identify if you already have the upgraded tensioner by noting the size of the hex nut welded to the tensioner. 17 mm = the original, 15 mm = the upgraded version.

    That said, I've had an upgraded version completely frozen in place, i.e. unable to adjust any tension. And, I still have the startup knocking. Have replaced right side tensioner as well. Still investigating.
    Saw this happen once before on a friends 1200RT which has the same new tensioners. A very minor scoring of the inner piston was found to be the cause upon disassembly. The mechanic at Ozzies felt that this was a manufacturing defect. He figured with all the oil in there it certainly did not happen due to lack of lubrication.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

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    Left Coast Rider
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    Quote Originally Posted by happy wanderer View Post
    He figured with all the oil in there it certainly did not happen due to lack of lubrication.
    Was he using synthetic?


  15. #15
    Pepperfool GSAddict's Avatar
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    New style tensioner

    Quote Originally Posted by lkchris View Post
    You identify if you already have the upgraded tensioner by noting the size of the hex nut welded to the tensioner. 17 mm = the original, 15 mm = the upgraded version.

    That said, I've had an upgraded version completely frozen in place, i.e. unable to adjust any tension. And, I still have the startup knocking. Have replaced right side tensioner as well. Still investigating.
    If it is frozen in place (not compressing) it has been used before and is full of oil.

    You must depress the little ball inside and pump the oil out before re-installing.
    '
    Ufda happens..........

    Need your R11xx Hall sensor rewired? PM me.

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