1200 GS off idle surge problem - BMW R1200GS Forum : R1200 GS Forums
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post #1 of 20 (permalink) Old 11-Dec-2016, 12:01 PM (750) Thread Starter
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Unhappy 1200 GS off idle surge problem

I have a 2012 GS that I ride off road as much as possible. I am amazed at how well it goes over some pretty rough terrain, even with cross tires. It does one thing that I need to get fixed before it gets me hurt. It has an off idle surge with the smallest throttle input. Changing gears, transitioning from seated to standing up, and especially going over bumps. It is just dangerous. Can anyone advise me on what to do?
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post #2 of 20 (permalink) Old 11-Dec-2016, 02:08 PM (839)
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1200 GS off idle surge problem

I had the same issue on my '09 GSA and installed a Booster Plug to calm things down. It worked for me.

BMW R1200GS BoosterPlug

I hope this helps,

Mike
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post #3 of 20 (permalink) Old 11-Dec-2016, 04:36 PM (941)
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That's about (booster type plug that enriches the air/fuel mixture) the only solution as the fuel map is programmed very lean at/near idle which is what causes the surge (lean surge).

On my 2005 GS there was a little trick that involved soldering a little $2 6K or 10K ohm resistor in parallel to the wire from the temp sensor in the airbox that leads to the computer that fixed this problem for me, I have not heard about a similar simple repair for the LC GS.

Pictorial: How to increase drivability for $2.00 | Adventure Rider
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post #4 of 20 (permalink) Old 11-Dec-2016, 06:19 PM (013) Thread Starter
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Thank You! JetSpeed and Mike for your helpful answers. Not sure what to do and wondering why this problem hasn't been addressed by BMW. It is dangerous and probably should be covered in a recall that corrects the problem. Anyone else have any input? I'm not waiting on BMW and really do need to fix this.
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post #5 of 20 (permalink) Old 12-Dec-2016, 12:46 AM (282)
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Throttle balance

Try a simple throttle balance, it should smooth the bike out at all speeds.
The transition from Off, to On can sometimes be a little lumpy if one cylinder is trying to lead the other, you need them opening at the same time.
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2004 R1200GS. 88, 000 km
2007 R1200GS. 34000 km.
current bike. 2010 R1200GS. 45000 km
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post #6 of 20 (permalink) Old 12-Dec-2016, 05:01 AM (459)
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1200 GS off idle surge problem

Well, I suspect the reason for the touchy throttle can be traced back to the lean fueling needed to pass government regulations. The Booster Plug I installed was a plug 'n play and eliminated the issue. I also noticed it quit backfiring when I geared down and didn't affect the mileage. JetSpeed is more mechanically/technically than I am so, perhaps, he could lend a hand as to the whys and wherefores.

Hey, stay warm up there in Deep Gap. I'm just down the road from you in High Point.

Mike

Last edited by mikec; 14-Dec-2016 at 03:51 AM (410).
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post #7 of 20 (permalink) Old 12-Dec-2016, 05:16 PM (970) Thread Starter
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Thumbs up

Hi Mike. Lets ride! call or text 828-964-6311 or email extremenc@gmail.com
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post #8 of 20 (permalink) Old 16-Dec-2016, 05:25 PM (975) Thread Starter
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whats up with this throttle balance?

Quote:
Originally Posted by gdayjr View Post
Try a simple throttle balance, it should smooth the bike out at all speeds.
The transition from Off, to On can sometimes be a little lumpy if one cylinder is trying to lead the other, you need them opening at the same time.
Hey Graham! Thank you for your input on this and it seems valuable. One question - what is throttle balance?
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post #9 of 20 (permalink) Old 16-Dec-2016, 09:14 PM (134)
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Same same,sorta

Two separate cylinders, two separate fuel injectors. If they are not working in harmony or "balanced" one will be creating a greater vacuum than the other when the throttles are opened.

When the throttle is closed, there are stepper motors that control each of the injectors to keep the tick over speed at a pre set limit.

It is a very simple procedure, and helps immensely with a smoother rise in power, and eliminates the surging when running a slow speeds, when you are just about on the throttle, at that speed one throttle is leading, and one is dragging...hence the need for them to be balanced.

Have a look at the following.

R1200 TB Sync


idle throttle body sync r1200gs uneven | Adventure Rider
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Graham Day. Sydney Australia
2005 R1200GS 93,000km (Stolen)
2004 R1200GS. 88, 000 km
2007 R1200GS. 34000 km.
current bike. 2010 R1200GS. 45000 km
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post #10 of 20 (permalink) Old 17-Dec-2016, 06:14 PM (010) Thread Starter
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Unsincronized throttle cables....

If I am reading this correctly then there is a separate cable adjustment on the intake tube on both sides of the engine. Correct?
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