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Thread: Is there a FIX for Oil Head surging? 95' R1100R

  1. #61
    Registered User roger 04 rt's Avatar
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    Quote Originally Posted by Pauls1150 View Post
    That bugs me, a LOT:
    Won't those holes permit unfiltered air directly into the intake tract?
    (Maybe the engineers depend on the sheltered location.)
    One of mine is covered by the mounting for my fuel filter, the other is still open.
    Maybe they're for the air temperature sensor? or What???
    On my R1150RT those are sealed indentations and not open to the intake manifold ... at least that's my recollection. Looks like a place to insert a screw for another option.

  2. #62
    Day Dreaming ... happy wanderer's Avatar
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    Interesting. Yet another tiny detail that is different on the 1100 and the 1150. See that nail in the hole there? It is 1.5 inches long and only half of that is sticking out from the hole (s) in my airbox. I did not make them. It came that way. I wonder why the 1100 has them and the 1150 does not?

    1100RT airbox top.jpg
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  3. #63
    Registered User PAS's Avatar
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    ????? My 1150 has them. I'm the one that asked about them. Yes they are dead ended holes that do not go into the airbox.

  4. #64
    Day Dreaming ... happy wanderer's Avatar
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    I think the confusion may be arising from a question in another thread where Pauls1150 asked Roger to take a look at post 59 and 60 in this thread. Roger responded. I responded. Anyway, it seems the holes or indentations are dead ended. In both models.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  5. #65
    24991 Pauls1150's Avatar
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    Exactly correct; I asked in two places, and was answered.
    Just for my own mental peace, I had to go check mine -
    The holes are there but don't go through.
    I don't recall if my 1150RS had them, and I sure as [heck] don't recall if my 1100 had them.
    Very strange nonetheless.
    I don't recall any option that might fit there.
    Paul S

  6. #66
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    [QUOTE=happy wanderer;895503]Interesting. Yet another tiny detail that is different on the 1100 and the 1150. See that nail in the hole there? It is 1.5 inches long and only half of that is sticking out from the hole (s) in my airbox. I did not make them. It came that way. I wonder why the 1100 has them and the 1150 does not?

    My 49 state, 1995 R1100R does NOT have any holes in the lid. (or nails)

  7. #67
    RD'nNH&AZ rdhudson's Avatar
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    Smile R1100-Nope

    My R100R "98" does not have them. Perhaps it should be called a "smooth top."
    2002 F650GS, 1998 R1100R 75th anniversary edition, 1983 R80RT (just sold), 1959 R60 (in restoration), Honda CT90
    If you must make a mistake, make a new one each time.

  8. #68
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    Quote Originally Posted by rdhudson View Post
    My R100R "98" does not have them. Perhaps it should be called a "smooth top."
    smooth tops rule

  9. #69
    Proud Veteran SteveAikens's Avatar
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    Quote Originally Posted by james1300 View Post
    I have owned my bike since new.
    I have taken it to 5 dealers.
    I even took it all the way down to Silicon Valley. (I live in the Pacific N.W.)
    Nobody can seem to get the 'SURGING' out of the fuel management system.

    Coming off the hi-way(75mph) down to 35mph in 5th gear the engine' hunts', surges.
    Hold it at 35mph and it surges.
    It surges at 35mph. When I open the throttle it goes away.

    Is there a fix for the oil head surge?
    A cure?
    I rarely look at the Oilheads Forum so I'm pretty late to lunch. However, my very first question - that no one has asked - is why in the world are you lugging the engine down to 35 mph in 5th? Keep the engine/vehicle speed matched within the power band and unless there is a fairly significant problem with the engine [aka, porous heads for example] the bike should not surge.

    Here's a link to some guidelines that may help.
    http://www.nmpcs.com/r11r/
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    Steve Aikens, Clovis, NM
    BMW MOA #6218
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  10. #70
    Pepperfool GSAddict's Avatar
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    Air box holes

    They are dead end holes for screws that hold the Clamp for the Diagnostic plug on the 1150's
    The dead end is to stop any water from running into the air box.


    '
    Ufda happens..........

    It's all about the details.

  11. #71
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    Quote Originally Posted by SteveAikens View Post
    ...why in the world are you lugging the engine down to 35 mph in 5th? Keep the engine/vehicle speed matched within the power band
    +1
    Ride Safe, Ride Lots

  12. #72
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    Quote Originally Posted by SteveAikens View Post
    I rarely look at the Oilheads Forum so I'm pretty late to lunch. However, my very first question - that no one has asked - is why in the world are you lugging the engine down to 35 mph in 5th? Keep the engine/vehicle speed matched within the power band and unless there is a fairly significant problem with the engine [aka, porous heads for example] the bike should not surge.

    Here's a link to some guidelines that may help.
    http://www.nmpcs.com/r11r/
    Your right. It should not surge. However, BMW knows of the problem with the 94-96 R1100's.
    I'm not riding around in 5th gear at 35 mph.
    It surges (or did) coming from 70-75mph down to 35 and the surging would start in ANY gear.
    It's a problem with Motronic's of that vintage.

    The FIX for my 48 state R1100R is posted.

  13. #73
    Day Dreaming ... happy wanderer's Avatar
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    Quote Originally Posted by SteveAikens View Post
    I rarely look at the Oilheads Forum so I'm pretty late to lunch. However, my very first question - that no one has asked - is why in the world are you lugging the engine down to 35 mph in 5th? Keep the engine/vehicle speed matched within the power band and unless there is a fairly significant problem with the engine [aka, porous heads for example] the bike should not surge.

    Here's a link to some guidelines that may help.
    http://www.nmpcs.com/r11r/
    "Should not surge" indeed. Surging has nothing to do with the power band and everything to do with closed loop fueling issues and cylinder to cylinder imbalance. These coupled with EPA laws that demand very lean fuel mixtures on big twins and you have surging issues galore. And it's not just

    If you look at Snowbum's final solution to the surging on the 1100R in question he removed the O2 sensor and anything else to do with pollution control. Once you pull the cat code plug you have an ECU that is ignoring the O2 sensor anyway. The bike will then run with richer mixtures in open loop so of course it stops surging assuming everything else is in a good state of tune.

    As for running the engine in low RPMs it's actually no problem whatsoever once you've enrichened the mixture by 4% to 6%. Then it will pull like a train at any RPM. Like a big twin should.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  14. #74
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    Approximately 1300 miles ago, I replaced the pink coding plug with a jumper between #30 and #87a as shown in post #16 of this thread. My 1998 R1100R runs much better since then - very good acceleration and no surging - much more fun to ride. The gas mileage improved from 45.87 to 46.59 . Like someone stated before, this was the cheapest and most effective modification I made to the bike so far.

  15. #75
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    Quote Originally Posted by happy wanderer View Post

    As for running the engine in low RPMs it's actually no problem whatsoever once you've enrichened the mixture by 4% to 6%. Then it will pull like a train at any RPM. Like a big twin should.
    regardless of fueling concerns and adjustments, 35 mph in top gear would be lugging your motor, and that is not good for it. Can you get away with it? Probably. But why would you want to?
    Ride Safe, Ride Lots

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