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Old 07-23-2014, 07:30 PM   #1
Funkin Rollin OP
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My bike is Lunging/Surging

Hey guys, I have a 2001 R1100R with just shy of 30k miles on it. Its been doing this thing lately where I'll be cruising at steady RPMs and it lunges a bit back to front. Its not super severe but obviously its not cool, and if it gets worse it could be a safety hazard. I havent had the bike for very long and its the first BMW motorcycle ive had and is definitely a lot more techi than my other bikes, and my first bike thats fuel injected. Im not running out of gas, its been happening with a full tank, but im thinking its fuel system related. Any Ideas or Wisdom would be appreciated Aside from this, Im super stoked on this bike and really hope I can step my game up and keep this mechanical masterpiece in good shape for a long time

THANKS
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Old 07-23-2014, 07:35 PM   #2
def
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Do you know if the filter and lines in the tank have been serviced?

Those line can deteriorate (they're submerged in fuel) and crack resulting in a loss of fuel pressure to the injectors.
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Old 07-23-2014, 09:32 PM   #3
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Someone recently wrote about a similar issue finally being found and fixed. They removed a very comfortable mouse/rat nest from the airbox.
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Old 07-24-2014, 05:46 AM   #4
MotorradMike
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Surging is a common problem with this engine.
There are lots of things you can do to reduce it.

Check the Gspot FAQ at the top of the forum, section 3.31 offers solutions.

I'd start with new plugs(I like Autolite 3923), valve adjust, and TB sync; in that order.
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Old 07-24-2014, 05:51 AM   #5
def
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The engine needs more fuel. Read Roger04rt's posts regarding Lambda shifting.
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Old 07-24-2014, 08:10 AM   #6
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+1 on all of the above, I went from a 1200 to a single spark 1150 and it drove me insane, then I out some good plugs, adjusted the valves and sync'd the TB and things got better, the next improvement for me was getting a boosterplug which made it run a bit richer and really reduced the surge..
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Old 07-24-2014, 08:46 AM   #7
Core10metal
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Quote:
Originally Posted by luca9277 View Post
the next improvement for me was getting a boosterplug which made it run a bit richer and really reduced the surge..
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Old 07-24-2014, 09:18 AM   #8
Ludlow
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The aforementioned interventions helped a little, but I did not get real relief until I installed a DynoJet Power Commander. It has worked well for over ten years, now.
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Old 07-24-2014, 10:40 AM   #9
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I encourage everyone to read the many posts by Roger04RT, GS Addict and the others who have had input and done testing and posted results on Lambda shifting and the resulting elimination of surging and other driveability issues.

http://www.advrider.com/forums/showthread.php?t=901788

Post 11 tells the story in lay terms.
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Old 07-27-2014, 06:47 PM   #10
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Thanks Everybody for the input. Looks like Ive got some homework to do....
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Old 07-27-2014, 10:01 PM   #11
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Just replaced the plugs with autolite 3923 and it seems to be a tad better but the surging is still happening. For these bikes I see that you have to change the engine oil and the gearbox oil seperately, do you use the same oil for those?
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Old 07-27-2014, 10:05 PM   #12
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Quote:
Originally Posted by def View Post
Do you know if the filter and lines in the tank have been serviced?

Those line can deteriorate (they're submerged in fuel) and crack resulting in a loss of fuel pressure to the injectors.
No I havent gotten into the fuel system yet, but it is definitely on the list
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Old 07-27-2014, 10:28 PM   #13
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Quote:
Originally Posted by Funkin Rollin View Post
Just replaced the plugs with autolite 3923 and it seems to be a tad better but the surging is still happening. For these bikes I see that you have to change the engine oil and the gearbox oil seperately, do you use the same oil for those?
Yep, you simply pour new oil in the engine, then recycle the used engine oil into the tranny and cycle the tranny oil into the final drive.
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Old 07-27-2014, 10:36 PM   #14
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Originally Posted by stevie88 View Post
Yep, you simply pour new oil in the engine, then recycle the used engine oil into the tranny and cycle the tranny oil into the final drive.
You dont put new oil in the gbox?
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Old 07-27-2014, 10:43 PM   #15
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20W50 for the engine
75W90 or 75W140 for the gearbox and final drive.
I suggest you get a manual.
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