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Thread: R1200 series Throttle Body Sync Pictorial

  1. #1
    07 R1200GS Rich's Avatar
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    Hiya Jim,

    Not one to do a whole lot of my own maintenance, I was motivated while going through all your "how to" threads, which you have do a super job on!

    Today I tackled the valve adjustment and throttle body adjustment on my 07 GS. My bike has been idling rough, and backfiring more than I thought it should. The valve job went smoothly, and everything was pretty good except I had a tight exhaust valve on the right side. Easily taken care of with your directions, and I got them all adjusted in less than a hour. Not bad for a rookie.

    Ok, on to the throttle body adjustment. I guess I was one of the unlucky ones. My idle on the Twinmax bounced, with a 2 as the center. You say you have never seen that, but I sure did. Lucky me.....

    Anyways, I ran the RPM's up, at 2K and 4K the needle was dead center, or too close to worry about. So then I started to look at the idle you say there is no adjustment for. I crawled below and watched the bodies move (with the bike off) as my wife ran the throttle, and I could see a stopper screw where the spring loaded plates stop against.

    So looking at the top of the bodies, I saw a rubber cap covering a 10mm screw. By backing out the left throttle body screw, I was able to bring my Twinmax needle to center, which started out way to the right. I gotta believe that is probably the way to adjust the idle, you can take a look and verify if it looks right to you. My idle immediately smoothened out.

    Here's a picture of the screw, it has some blue silicone looking goober on it that held the rubber cap on, or maybe it is blue locktite. In either event, it was easy to adjust.




    I just took the bike out and it runs smoother than ever. And it quit shaking at idle, which is why I was wanting to do this work in the first place.

    I'm pumped! Thanks for all the good info you provide, it's easy to follow and understand.

    I'm off for an afternoon ride!

    Rich

  2. #2
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    Idle screw

    Rich i have a 05 12rt and on my first tune up i performed myself at 18000 i looked at a tb sync for an 04 1150 and i assumed that this screw with the blue thread locker on it was the same brass screw used on earlier models to adjust idle speed, well after 3 weeks and 850 dollars and 2 new throtle bodies later, i learned the hard way not to touch these screws, i to obtained a better and smother idle but the following morning the bike was difficult to start, and would not hold an idle for 15-30 seconds, once warmed up it ran ok but stumbled on throttle opening, the dealer thought he could take the tbs off another new bike and measure the clearence of the opening, this proved impossible for the dealer, in the end bmwna service rep advised that these are set at the factory on a bench flow meter and matched at the factory, since that time i purchased jims video and no longer worry about the idle, please be carfull adjusting these screws, as a point of shame i was told by the bmw rep that i was the first person to screw up there tbs by adjusting this screw.

  3. #3
    A bozo on the bus deilenberger's Avatar
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    Rich,

    That is the screw that is IMHO never to be touched. Idle sync is done by the stepper motors that Jim shows unplugged. Apparently the dealer can tweak this sync with the GT1 computer.. the blue screw is the base setting for the throttle plates - and is set at the factory by putting the throttle bodies on a flow bench to match the closed positions.
    Don Eilenberger http://www.eilenberger.net
    Spring Lk Heights NJ NJ Shore BMW Riders New Sweden BMW Riders
    '07 R1200R (current ride) and some bimmers.. and a Porsche

  4. #4
    07 R1200GS Rich's Avatar
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    You guys have me concerned now. Good thing I kept an eye on how far I turned it, if that matters.

    In my tiny mind I would think that you would adjust the plates for a syncronized idle with the stepper motors disconnected, but it appears I'm incorrect by your statements.

    I did a cold start this morning and went for a nice ride. It fired right up and idled great. The bike is still running smoother than ever, and even when I started it cold it didn't shake like it has been before I did any tweaking. The Givi windscreen that normally fluttered wildly now sits almost perfectly still.

    So the big question: Do I put the screw back to where it was? My plan is to leave it as is, as long as it runs good. (I just ran out to the garage and started the bike again, it idles like a dream.)

    What do you guys think? And thanks for your comments.

  5. #5
    Kool Aid Dispenser! jimvonbaden's Avatar
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    HI Rich,

    I would make a note of how much you moved the screw, then ride it as is for a while and see if you have any rideability issues with it. Since you know the original setting, you should be able to get it back close enough that the stepper motors can ajust for it.

    I suspect you wont, though I agree with Don. The stepper motors will keep the bike close to tune, even if the Twinmax isn't showing it. However, I am very curious if the screw you adjusted moved the butterfly valve? If it did, that would be a bad thing, because the stepper motors will have to try to compensate.

    I'll check into this when I get a chance, and see if I can determine for sure what the function of the screw is?

    Thanks for the input,

    Jim

    PS I just don't get what happened with Carl's bike. I can't see how he irreperably damaged the TB's, nor why a competant tech could not reset them?

    Quote Originally Posted by Rich View Post
    You guys have me concerned now. Good thing I kept an eye on how far I turned it, if that matters.

    In my tiny mind I would think that you would adjust the plates for a syncronized idle with the stepper motors disconnected, but it appears I'm incorrect by your statements.

    I did a cold start this morning and went for a nice ride. It fired right up and idled great. The bike is still running smoother than ever, and even when I started it cold it didn't shake like it has been before I did any tweaking. The Givi windscreen that normally fluttered wildly now sits almost perfectly still.

    So the big question: Do I put the screw back to where it was? My plan is to leave it as is, as long as it runs good. (I just ran out to the garage and started the bike again, it idles like a dream.)

    What do you guys think? And thanks for your comments.

  6. #6
    07 R1200GS Rich's Avatar
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    It sounds like Carl went to cranking on both sides, which probably got everything out of wack. He can add details if he reads this. Hard to believe it would require new bodies, you would think someone could put them back to specs.

    It appears to me that the screws are the close stops for the plates. You can see a little ear on the plates that actually close and rest against the screws. I actually backed off the left side screw about 90 degrees, letting the plate close a hair more. That's my take on it. My adjustment didn't affect the reading at higher RPM's at all.

    I will take your advice and ride it, I have a 4 day ride planned in the Black Hills this weekend. I should know by then if something is amiss.

  7. #7
    Kool Aid Dispenser! jimvonbaden's Avatar
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    I agree, and it sounds like a reasonable plan!

    Keep us informed as to what happens!

    Jim

    Quote Originally Posted by Rich View Post
    It sounds like Carl went to cranking on both sides, which probably got everything out of wack. He can add details if he reads this. Hard to believe it would require new bodies, you would think someone could put them back to specs.

    It appears to me that the screws are the close stops for the plates. You can see a little ear on the plates that actually close and rest against the screws. I actually backed off the left side screw about 90 degrees, letting the plate close a hair more. That's my take on it. My adjustment didn't affect the reading at higher RPM's at all.

    I will take your advice and ride it, I have a 4 day ride planned in the Black Hills this weekend. I should know by then if something is amiss.

  8. #8
    07 R1200GS Rich's Avatar
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    Several cold starts, a short warm-up idle, and a 1000 miles later, all is well.

  9. #9
    Kool Aid Dispenser! jimvonbaden's Avatar
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    Quote Originally Posted by Rich View Post
    Several cold starts, a short warm-up idle, and a 1000 miles later, all is well.
    Sweet!

    Something I noticed on Tina's bike when I did the 24K last week is that hers has no covers on them like the GS. Probably because they are under a fairing piece.

    My friend Kermit is going to do his 36K this weekend, and has complained about his idle being rough. I told him about this, and he will likely give it a try, keeping very close tabs on exactly how much he moves the screw.

    Thanks for the update!

    Jim

  10. #10
    Registered User burnszilla's Avatar
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    With the stepper motors disconnected what should the idle RPMs be?
    I'm using a Synchromate2 and it also tells you the RPMs.
    Stephen Burns - 2007 R1200GS
    BMW MOA Lifetime Member
    www.burnsmoto.com

  11. #11
    Registered User burnszilla's Avatar
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    I reckon 1100 RPM +/-50
    Stephen Burns - 2007 R1200GS
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  12. #12
    Kool Aid Dispenser! jimvonbaden's Avatar
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    Quote Originally Posted by Burnszilla View Post
    With the stepper motors disconnected what should the idle RPMs be?
    I'm using a Synchromate2 and it also tells you the RPMs.
    The stepper motors don't effect the idle rpm. It should be around 1100 +- 50.

    Jim

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    The stepper motors don't effect the idle rpm. It should be around 1100 +- 50

    The stepper motors don't effect the idle rpm. It should be around 1100 +- 50



    Forgive please, just what do the stepper motors do? Or control?
    max

  14. #14
    Kool Aid Dispenser! jimvonbaden's Avatar
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    Quote Originally Posted by maxscycle View Post
    The stepper motors don't effect the idle rpm. It should be around 1100 +- 50



    Forgive please, just what do the stepper motors do? Or control?
    max
    Unless a dealer tells us, and none seem willing to do so, we are only guessing, but since several tests at idle with the stepper motors connected, then disconnected, have shown absolutely no changes, most of us are guessing it controls off idle transitions, and possibly idle balance, but not idle speed apparently.

    Jim

  15. #15
    A bozo on the bus deilenberger's Avatar
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    Quote Originally Posted by JimVonBaden1 View Post
    Unless a dealer tells us, and none seem willing to do so, we are only guessing, but since several tests at idle with the stepper motors connected, then disconnected, have shown absolutely no changes, most of us are guessing it controls off idle transitions, and possibly idle balance, but not idle speed apparently.

    Jim
    This is a case where I would have beg to disagree.

    The stepper functions should be identical to the function of the BBS (Big-Brass-Screw) on oilheads and the fast-idle control.

    The BBS set the idle throttle body balance AND the idle speed. The butterflys are set to a default position at the factory and are not to be field adjusted. The steppers control idle speed - especially duing cold start, just like the fast idle lever did on the oilheads.. they allow more air around the butterfly to maintain idle speed on a cold engine.

    It's unclear to me what "off idle transitions" are..

    For a test of the stepper functions.. stop the engine after idling when hot. Disconnect the steppers - then let it cool overnight and try starting it. Bet it won't idle happily when cold.

    Disconnecting and reconnecting at a single temp (a warm engine for instance) won't show a difference between connected and disconnected - since the system doesn't have to compensate for temperature of the engine.
    Don Eilenberger http://www.eilenberger.net
    Spring Lk Heights NJ NJ Shore BMW Riders New Sweden BMW Riders
    '07 R1200R (current ride) and some bimmers.. and a Porsche

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