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Old 03-02-2012, 05:50 PM   #1
FlatDarkGS OP
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Harmonizer Suggestions

I recently purchased a Harmonizer so that I could balance the throttle bodies on my 2011 1200GS. When it was time to do the deed for the first time, everything went very smoothly and I followed the instructions per JVB's camhead DVD (minus the fans...my temp did go up to six bars whereas its normally a very static four...but no big deal as it was still in the acceptable range). I did not, however, disconnect the stepper motors...

Is there any reason I should have done this beforehand? Also, it seemed to me that making adjustments to the cable once the set screw is loose is most easily done by hand, as the wrench wants to vibrate all over the place. Is this what the rest of you have found too?

Finally, once you have achieved balance at 3500 RPM, are you truly finished? Also, I was thinking next time it might be easier to mark the throttle adjustment screw with a marker so I can tighten the set screw and visually see that my positioning hasn't been compromised in the process. Anyone have any other pearls/suggestions?

Thanks all!!
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Old 03-03-2012, 08:13 PM   #2
Pickup man
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I dont have any suggestions on it yet as I am about to do a throttle sync as soon as I get the tool.
Still not sure which one to buy though...twin max, carb tune etc.. Any suggestions about that?
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Old 03-03-2012, 09:25 PM   #3
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I just noticed that this thread has 148 views and only one other post. (until this one)

Hopefully JVB will be along shortly to clue you in because what I'd tell you would just make your head hurt.

And as for which differential synch tool is 'best' the Harmonizer gets my vote and by a HUGE margin.

JJ
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Old 03-04-2012, 01:05 AM   #4
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Thumb Grok's device roks

The harmonizer is very good, even up to V 12 engines (my bro's Jag)
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Old 03-04-2012, 04:13 AM   #5
bmdavis
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I've used the twinmax and the harmoniser. The harmoniser is by far the most accurate and easy to use. I'm glad I bought it last summer.
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Old 03-04-2012, 05:17 AM   #6
opposedcyljunkie
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Quote:
Originally Posted by FlatDarkGS View Post
Finally, once you have achieved balance at 3500 RPM, are you truly finished? Also, I was thinking next time it might be easier to mark the throttle adjustment screw with a marker so I can tighten the set screw and visually see that my positioning hasn't been compromised in the process. Anyone have any other pearls/suggestions?

Yes, that's pretty much it. You will note that at idle speed, the Harmonizer would show that they are not balanced. But I understand that the allowable variance is +/- 25mmHg.

Throttle adjustment screw? Maybe you meant the cable adjuster screw. The adjustments can be so minute that marking the screw position would be useless. In time, cables stretch that's why periodic checking of cable pull balance is required.
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Old 03-04-2012, 05:31 AM   #7
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Best harmonizer: Probably Graham Nash. Don Henley is a close second.
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Old 03-04-2012, 06:12 AM   #8
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Best harmonizer: Probably Graham Nash. Don Henley is a close second.
Thats funny. Seems like harmonizer is more popular choice, who sells these things at a descent price?
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Old 03-04-2012, 06:32 AM   #9
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Thats funny. Seems like harmonizer is more popular choice, who sells these things at a descent price?
Only Grok makes and sells them. Only one price anywhere AFAIK.

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Old 03-04-2012, 11:49 AM   #10
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see this thread
http://www.advrider.com/forums/showthread.php?t=701625

JJ
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Old 03-04-2012, 12:11 PM   #11
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Originally Posted by johnjen View Post
Thanks for getting the responses flowing!! This link actually raises another question.. On the video it shows the balance being adjusted with a screwdriver via a screw on the TB. On my 2011 camhead I had to use two wrenches and the throttle cable which was much more of a pain in the ass. Why the difference?

Also, feel free to make my head hurt with your response dude (if it's info that isn't contained in your link). I'm a sponge when it comes to R1200GS info...I may not absorb it, but i'd rather have it out there and not understand all of it than have a look like this ----> and be *completely* ignorant!
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Old 03-04-2012, 12:12 PM   #12
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Originally Posted by opposedcyljunkie View Post
Yes, that's pretty much it. You will note that at idle speed, the Harmonizer would show that they are not balanced. But I understand that the allowable variance is +/- 25mmHg.

Throttle adjustment screw? Maybe you meant the cable adjuster screw. The adjustments can be so minute that marking the screw position would be useless. In time, cables stretch that's why periodic checking of cable pull balance is required.
Yessir I did mean the cable adjuster screw. Thanks for the correction.

FlatDarkGS screwed with this post 03-04-2012 at 12:13 PM Reason: Too much coffee
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Old 03-04-2012, 12:43 PM   #13
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When the 1200's came out BMW changed the entire fuel injection computer. The screwdriver is used on the 11xx series of motronic EFI computers because they have a Big Brass Air Screw that manually adjusts the idle air bypass circuit (idle speed circuit) for each throttle body. For more on this look in the Hall of Wisdom for the document TBSD.

The 1200's use a computer controlled stepper motor to adjust the idle air bypass, so there is no manual adjustment.

In order to 'properly' adjust the throttle bodies, both stepper motors should be 'parked' so that they are in a fixed equal air delivery position and THEN using the Harmonizer (or manometer of your choice) adjust the throttle cables while the throttle is in an open position to balance the reading shown by the manometer.

This parking of the steppers can be accomplished by using either a GS-911 tool, the BMW factory computer diagnostic tool, or other electronic tools designed for this purpose. It should be noted that simply unplugging the steppers is NOT the same as 'parking' them and further should only be done by someone who knows what they are doing. I say this because while the chances are slim it is possible to 'brick' the EFI computer if you unplug or plug the steppers into the wiring harness at the wrong time. This would be bad (read $$$$). And the synch job can't be done properly UNLESS both steppers are properly parked.

JJ
ps does your head hurt now?
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Old 03-04-2012, 05:36 PM   #14
FlatDarkGS OP
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Quote:
Originally Posted by johnjen View Post
When the 1200's came out BMW changed the entire fuel injection computer. The screwdriver is used on the 11xx series of motronic EFI computers because they have a Big Brass Air Screw that manually adjusts the idle air bypass circuit (idle speed circuit) for each throttle body. For more on this look in the Hall of Wisdom for the document TBSD.

The 1200's use a computer controlled stepper motor to adjust the idle air bypass, so there is no manual adjustment.

In order to 'properly' adjust the throttle bodies, both stepper motors should be 'parked' so that they are in a fixed equal air delivery position and THEN using the Harmonizer (or manometer of your choice) adjust the throttle cables while the throttle is in an open position to balance the reading shown by the manometer.

This parking of the steppers can be accomplished by using either a GS-911 tool, the BMW factory computer diagnostic tool, or other electronic tools designed for this purpose. It should be noted that simply unplugging the steppers is NOT the same as 'parking' them and further should only be done by someone who knows what they are doing. I say this because while the chances are slim it is possible to 'brick' the EFI computer if you unplug or plug the steppers into the wiring harness at the wrong time. This would be bad (read $$$$). And the synch job can't be done properly UNLESS both steppers are properly parked.

JJ
ps does your head hurt now?
Awesome. Just awesome answer. Thank you. Most of it makes sense...at least enough of it to plan on how to proceed with the harmonizer from here on out.

...and yes, my head now feels like I've stared at your avatar for two straight hours.
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Old 03-05-2012, 12:26 PM   #15
BenFongTorres
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I have the GS911 and the Harmonizer but have yet to do the deed. Waiting for the snow to melt at my place so I can ride the bike and warm it up properly as I understand is optimal. My question is if I "Park" the Steppers with the 911 do I need to put them back into "Drive" after the TB Synch or is it just synch and go?
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