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Thread: dual spark or single spark?

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    dual spark or single spark?

    does the size of the head or the positioning of the bolts holding the cover in place differ at all on an r1100s depening on whether it is a dual spark or single spark? And what exactly does the single vs double mean? On the 2003 BCR model will the same carbon cover fit this bike as any other BCR model, or was there a difference? Thanks for your help!

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    Single spark plug and dual spark plug versions of the BCR exist and is dependent on year of manufacture. It also appears that there is more than one style of valve cover for these bikes?

    Why do you ask? Perhaps if we knew your intent we could be more helpful.

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    I have a 2003 bcr. I bought aftermarket carbon covers. Holes don't seem to match up. But I haven't actually removed the head cover bolts yet to confirm yet. I have two questions:

    1. Is there a difference in bolt pattern on the cylinder head between dual and single? This is important because I bought carbon head covers. I haven't placed them flush on the cycling head yet because I was worried about taking the bolts out.

    2. Do I need to do anything before taking cylinder head bolts off (eg. Drain engine oil)? I ask because I did take one bolt off and it had oil on the tip when I pulled it off.

    If im clear to remove these bolts then I can figure the answer to qs1 pretty quickly. I've just never removed the cylinder head bolts before. Thanks for your help.

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    Small road corner junkie pffog's Avatar
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    There is a difference between the single and dual plug version of the CF cover, the single is a solid cover the TS has a window and relief around the plug wire/coil assy. I am not sure if they will interchange even if bolt pattern is the same.

    There is NO oil held by the CF cover bolts, and for that matter you don't need to drain the oil to pull the entire valve cover to adjust valves, the oil level is well below the bottom of the cylinders and heads. Yes there is a little captured oil that comes out, but that has NO bearing on how full the crank case is.
    2010 F800GS Full Ohlins package, '04 R1100S Replika
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    and just to clarify- you are not doing anything at all with the heads. you are just messing with the valve covers.
    Ride Safe, Ride Lots

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    Quote Originally Posted by pffog View Post
    There is a difference between the single and dual plug version of the CF cover, the single is a solid cover the TS has a window and relief around the plug wire/coil assy. I am not sure if they will interchange even if bolt pattern is the same.

    There is NO oil held by the CF cover bolts, and for that matter you don't need to drain the oil to pull the entire valve cover to adjust valves, the oil level is well below the bottom of the cylinders and heads. Yes there is a little captured oil that comes out, but that has NO bearing on how full the crank case is.
    Thanks pffog - very helpful. I will pull the bolts off today and figure out if the CF cover bolt pattern is correct for my bike. This should solve my problem. If it does not match I will have a set of brand new glossy finish CF covers for sale.

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    Quote Originally Posted by bikerfish1100 View Post
    and just to clarify- you are not doing anything at all with the heads. you are just messing with the valve covers.
    yup just the head cover....not messing with anything else. all im trying to do is install CF covers which requires removing two bolts from the head cover.

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    Quote Originally Posted by pffog View Post
    There is a difference between the single and dual plug version of the CF cover, the single is a solid cover the TS has a window and relief around the plug wire/coil assy. I am not sure if they will interchange even if bolt pattern is the same.

    There is NO oil held by the CF cover bolts, and for that matter you don't need to drain the oil to pull the entire valve cover to adjust valves, the oil level is well below the bottom of the cylinders and heads. Yes there is a little captured oil that comes out, but that has NO bearing on how full the crank case is.
    just to be certain, does this oil level apply to the cylinder leaning down while the bike is on the side stand? BCR has no center stand to keep the cylinders level.

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    Small road corner junkie pffog's Avatar
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    Quote Originally Posted by plexiform View Post
    just to be certain, does this oil level apply to the cylinder leaning down while the bike is on the side stand? BCR has no center stand to keep the cylinders level.
    Yes, unless it is really leaned over, just look at the sight glass and its level compared to the CYL., normal levels are way lower
    2010 F800GS Full Ohlins package, '04 R1100S Replika
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    Quote Originally Posted by pffog View Post
    Yes, unless it is really leaned over, just look at the sight glass and its level compared to the CYL., normal levels are way lower
    Thanks. Bolts off! Now waiting for BMW specific bolts to apply cf covers to head cover...... Got them at www.ascycle.com of course they cost a ton being BMW bolts. Hopefully will be done with this project this afternoon.

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    Registered User lkchris's Avatar
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    Quote Originally Posted by plexiform View Post
    does the size of the head or the positioning of the bolts holding the cover in place differ at all on an r1100s depening on whether it is a dual spark or single spark? And what exactly does the single vs double mean? On the 2003 BCR model will the same carbon cover fit this bike as any other BCR model, or was there a difference? Thanks for your help!
    The actual valve covers bolt up to the head exactly the same.

    The accessory carbon fiber covers for the valve covers differ between single and twin-spark models and since they do I'd assume they're not interchangeable.
    Kent Christensen
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    Quote Originally Posted by plexiform View Post
    Thanks. Bolts off! Now waiting for BMW specific bolts to apply cf covers to head cover...... Got them at www.ascycle.com of course they cost a ton being BMW bolts. Hopefully will be done with this project this afternoon.
    Pay close attention to the very low value torque spec when you tighten those head cover bolts; they are easy to strip.

    Oh ya, post a pic of the new covers on, or it did not happen

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    Quote Originally Posted by Rad View Post
    Pay close attention to the very low value torque spec when you tighten those head cover bolts; they are easy to strip.

    Oh ya, post a pic of the new covers on, or it did not happen

    thanks...will make sure to not overtighten...what do the specs say to tighten to?

    Will post pic when it done...didnt happen today. The bolts from AScycle didnt show up today...forgot it was a mail holiday. Will hope for tomorrow.

  14. #14
    Registered User rxcrider's Avatar
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    8 Nm

    Do not try to go snug or seated + 1/8 turn. There is a shoulder built into the screw that bottoms on the face of the head. Once it bottoms, you are done. Going past that just removes threads from the head.

  15. #15
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    +1 on what rxcrider said. You feel the valve cover screws bottom and you are done. Crosswise tighten pattern as per usual.

    I still remember the first time I pulled and replaced my first oilhead valve cover after many years of owning airheads. I was absolutely flabergasted that they had _finally_ designed a valve cover with a sturdy reusable gasket and easy to install screws!

    Don't get me wrong here. I love my old airheads but the oilhead valve covers are a thing of beauty and a joy forever. Well done BMW!
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
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