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Thread: 2010 R1200RT fueling problem / flat spot

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  1. #1
    Nick900
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    2010 R1200RT fueling problem / flat spot

    I everyone,

    I bought a damaged 2010 RT that had been dropped on its right side. The face of the cylinder head had been scuffed during the fall so it was replaced with a used unit. The bike has covered 7K and the engineer who fitted the new head felt it had covered less than 7K miles due to the condition of the valves. I checked with the dealer and they confirmed the head was correct [part numbers also matched] and the valves were the same for RT's GS's etc.

    I never rode the bike prior to the repair once the new head was fitted and again before riding I fitted a Remus end can and performance air filter.

    Now the bike struggles to pick the revs up from 3-4K and from 5- up to the redline? This is my third RT although first twin cam. I am familiar with basic servicing and have balanced the throttle bodies several times, each time there being a good balance at 3K but everytime I test ride flat spots at the rev ranges above.

    Idle is fine. A check on the plugs shows its not overfueling, if anything it appears quite lean [however I did clean the plugs thoroughly and they were quite clean to start with]. I have checked all coils and have a good spark.

    Any ideas or is it 150 round trip to the dealer?

    Regards

    Nick

  2. #2
    Registered User Woodbutcher's Avatar
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    May 2010
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    Austin, TX
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    What happens if you got back to the stock exhaust and air filter? Basically with those changes I'd expect it to run lean so I'd start with the last changes made before I start thinking it is something major.
    Rusty
    Austin, TX
    Two Wheeled Texans
    2009 R1200GSA

  3. #3
    BinkleyLane binkleylane's Avatar
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    Jul 2012
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    Springboro, OH
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    I own a 2012 RT and had some what sounds like the same issues and did a little research. I found that it appears that the manufactures tend to set up the engines to run lean to satisfy EPA and mileage issues. This causes non linear throtle responce which sounds like your problem.
    Look into this product. It works for me.
    Just a suggeston, I am not affiliated, just a happy user.

    http://www.boosterplug.com/shop/frontpage.html

    Bob
    B-est M-otorcycle (in the) W-orld
    Have Bike - Will Ride

  4. #4
    Registered User mneblett's Avatar
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    Nov 2005
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    Fairfax, VA
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    1,729
    There's a difference between the "BMW has to meet the EPA right on the edge leanness" OE fuel tables, and running a *lot* more lean with the pipe and air filter.

    The BMW hex/camhead fuel injection systems do not have intake air mass flow sensors. In order to eliminate the need for the cost of, and finding a physical place on the bike for, a MAS, the fuel tables have base values which are based on the stock intake flow, with corrections for atmospheric pressure and temperature, but not mass flow rate. The system does not have means to compensate for unexpectedly high air flow (the adaptation capability to adapt the base tables to drive the mixture to desired O2 sensor response does not appear to have enough "range" to correct for more than minor variations from nominal).

    My $0.02: This sort of mid-range weakness is a classic result of installing a freer-flowing pipe more suitable for high end HP, thereby altering the back pressure in the headpipes in the mid-range in an unfavorable way. I expect that in order to address such a significant leanness in the mid-upper rpm range, you'll need to invest in a more sophisticated piggy-back electronics unit (PowerCommander, LC-1, wideband O2 sensor, etc. as Roger04RT has done (there's a *massive* amount of info in his threads on altering AF ratio)) in order to more directly control/richen the AF mixture in the flat spot ranges.
    Mark Neblett
    Fairfax, VA
    #32806

  5. #5
    Nick900
    Guest
    I guess that could be the problem. What's strange is that I also have a late 2007 model and put a full remus exhaust decat not just back box and the same performance air filter and it adapted just fine?

    Regards

    Nick

  6. #6
    Registered User lkraus's Avatar
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    Nov 2011
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    Central Ohio
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    I'd consider the possibility of a weak or damaged coil. If the bike was "dropped" hard enough to damage the head (not just valve cover) the coil(s) may well be cracked. Try swapping in one or two known good coils.


    Larry

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