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Thread: 2005, R1200RT, Can't Sync throttle bodies.

  1. #1
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    2005, R1200RT, Can't Sync throttle bodies.

    Greetings all,
    I am unable to balance the throttle bodies on my '05 R1200RT.
    With engine off, I used a GS-911 to park/Sync the stepper motors,
    then with engine off I connected a Harmonizer and zero'd it out.
    Started the bike and the 2 vertical slashes were far to the left at -30 mb.

    I tried adjustment on the throttle side and had no room to go clockwise with the cable nut.
    Turning counter clockwise only made the mb reading go lower to -49 mb.

    I am unable to get the cable to adjust the display reading up in mb, or to the center of the display.

    what am I doing wrong?

    As usual, any help is very much appreciated.

    Rob

  2. #2
    Cam Killer marchyman's Avatar
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    Step 1: make sure you have cable slack at BOTH throttle bodies. With the throttle closes you should have 0.5~1.0 mm play regardless of the position of your handlebars.
    Step 2: adjust your valves
    Step 3: check idle balance. Anything less than 25 mbar is in spec. Assuming you have no air leaks and there is slack in the cable at both throttle bodies the only thing you can do to adjust idle balance is to set your valves. There is no other idle balance setting. Your valves must be the same side-to-side.

    Once the valves are adjusted correctly and the idle balance is within range you want to adjust the tension of the right side so the mismatch at 1400~1800 RPM is less than 15 mbar and that any imbalance is more-or-less constant (the low reading stays on the same side as the throttle is twisted).

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    Already adjusted valves.

    Thanks MarchyMan.
    I forgot to mention, before attempting the throttle sync I adjusted the valves following VonBaden's video to a T.

    Are you saying that the throttle cables at the bodies need to have the lower nut snug, but the upper nut loose to allow that 0.5 to 1.0 mm slack?

    Thanks again.

    Rob

  4. #4
    Cam Killer marchyman's Avatar
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    You should be able to twist the throttle and see the cables move from 0.5~1.0mm without moving the butterfly. Start the bike and pull on the throttle cables at the throttle bodies. If the RPM changes immediately that cable is too tight. The cable should move that 0.5~1.0mm before you detect any RPM change.

    I also left out a step. Don't do anything with the throttle bodies until the bike is at full operating temperature. I put about 10 miles on the bike before testing and adjusting cables.

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    I'll check these tonight.

    Thanks again marchyman.
    I'll check that cable play tonight.

    Rob

  6. #6
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    Ok, another stoopid ?

    I'm sure I already know this, but just making sure.
    Is the GS-911 "Idle Actuator Calibration" performed with the engine off?

    I saw that the instructions indicate the "Lock Idle Actuators" function is performed with the engine not running, but ignition on. Did not see such a clarification for the "Idle Actuator Calibration".

    Rob

  7. #7
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    Got the throttle bodied synced!

    Last night I got it figured out and got the TB's sync'd pretty close at 1800 - 2500 - 3000 - 3500 - 4000rpm.
    I had to go back & forth several time between the 2 sides.
    The only concern I have is the top cable adjusting nuts on both sides are about 3/16 - 1/4 inch above bottom.
    Is this normal?

    On a side note, the tapping sound I had coming from the clutch side cylinder is completely gone.
    Bike starts up, runs really well, sounds fantastic. I just haven't had a chance to take it out for a test ride.

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