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Mechanical and Technical Mechanical and technical topics, help, and discussions

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  • 1 Post By Sentinel
  • 1 Post By Motorbiker
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Jun 11th 2018, 08:47 PM   #1
 
  Mar 2018
  Gig Harbor

  2008 BMW R1200GS Adventure
2008 R1200GSA Suddenly Loose? Shakey? Possessed?

I posted this over on Advrider.com, but haven't gotten any responses yet (I waited almost a whole hour!). If any of you have any ideas, I'm all ears.

***


'08 R1200GS Adventure with 17k miles. It's rode like a champ ever since I got it a couple months ago. It's still running great, but I was riding it today and noticed that I was able to shake the handlebars and shake the tail end much easier than I ever remember it being before. Almost like I could have induced a tank slap.

I thought maybe some asshole messed with my suspension while I was up on the passenger deck of the ferry, but it all looks normal.

My next thought is that it seems as if the weights aren't distributed correctly (i.e., like when a truck is towing a trailer and you put all the weight at the back of the trailer). But the weights were all typical: my fat ass on the seat (260, 6'3"), half tank of gas, and my laptop and rain gear in the panniers.

I may have been sitting a few inches further back in the seat instead of riding right up on the tank like I usually do, but I wouldn't expect that to make such a dramatic difference.

This is my daily commuter, so I'd like to figure this out as soon as possible. It was easy enough to avoid, but I'd like to know if there's something I need to fix/adjust/etc.

Thanks, guys/gals.
Jun 11th 2018, 09:03 PM   #2
 307T's Avatar
 
  Jan 2016
  Washington County

  H-D
Before you do anything else, check your tire pressures (Occam's Razor). I am not sure what you are describing. If, when the bike is stationary, you are able to shake or get flex in the bars by pushing forward or pulling back towards you, there might be a loose top nut on the triple clamp. I don't know what to tell you about the back end. I am sure as well not a mechanic and my bike is 25 years old.
Jun 11th 2018, 09:39 PM   #3
 MarvTravis's Avatar
 
  Jan 2016
  Kirkland, WA

  Kawasaki ZX-14
Really low rear tire pressure can cause a bike to 'wallow'. That is the indicator when I've had a rear tire going flat.
Jun 11th 2018, 10:33 PM   #4
 
  Mar 2018
  Gig Harbor

  2008 BMW R1200GS Adventure
Quote:
Originally Posted by MarvTravis
Really low rear tire pressure can cause a bike to 'wallow'. That is the indicator when I've had a rear tire going flat.
Thanks, guys.

A few people replied at AdvRider.com and suggested the tire pressure as well. I didn't think it would be since I just checked it a few days ago, but turns out it was. The rear was down 8-10psi from where it should be, but the front was almost 15psi off.

Thought I must have a leak, but it turns out the in-line pressure gauge on the compressor is WAY the F Off. Inflated the tires to where the compressor said it was good, then checked with a separate gauge... yeah, front tire was 10psi lower than the compressor was telling me.

Really good to know, since I've been using the same compressor/gauge on my wife's van and we load that thing up with 4 kids, a dog, and a bunch of totally useless (but very important) shit.

I also made sure everything was tightened down and nothing was about to come off. There were a couple torx bolts that needed a little tightening, but nothing more than a half turn and nothing that would have been causing this.

Haven't rode it yet, but I'll let you know if there were any other issues after my commute in the morning.
Jun 12th 2018, 10:14 AM   #5
 Sentinel's Avatar
 
  Jun 2016
  Poor Tortured

  2015 Kawasaki Concours 14 - The Origame Sea-Dragon
My C14 has tire pressure monitors that I originally thought were fussy and extraneous. Now I watch tire pressure all the time.

Nice that you figured it out before it got away from you.

Maintenance, FTW!

There was a dude on this forum with a Harley a little while ago that had a squirrelly back end. Turned out to be loose spokes. Yeeks.
Didley likes this.
Jun 14th 2018, 04:59 PM   #6
 MarvTravis's Avatar
 
  Jan 2016
  Kirkland, WA

  Kawasaki ZX-14
Quote:
Originally Posted by Didley

The rear was down 8-10psi from where it should be, but the front was almost 15psi off.

Haven't rode it yet, but I'll let you know if there were any other issues after my commute in the morning.
Did inflating the tires to the proper pressure resolve your handling issues?
Jun 16th 2018, 06:56 AM   #7
 Motorbiker's Avatar
 
  Jan 2016
  Silverdale, WA

  1987 FZR 1000
Some bikes are prone to this phenomena when the rear tire gets worn flat due to more straight line riding. (Commuting). Usually not noticed unless you "shake" the handlebars back and forth or take both hands off the bars. Don't do that!
Didley likes this.
Jun 17th 2018, 04:35 PM   #8
 MarvTravis's Avatar
 
  Jan 2016
  Kirkland, WA

  Kawasaki ZX-14
Hey Didley. Assume you've had ample opportunity to verify your bike is now handling properly, (or not). After you ask, and others make suggestions to help you isolate and correct problems, it's courteous to post up and let them know how you made out, rather than just letting the thread dangle.
Jun 18th 2018, 09:17 PM   #9
 ShootPDX's Avatar
 
  May 2016
  Happy Valley area (Clackamas)

  SV650S Silver - HD 1250 Hammer Sportster w/Screaming Eagle stuff - GSXR-750 K12
https://www.youtube.com/watch?v=_mXkdr4ZBAs

BMW Fatal Flaw

^^^ Not saying this is it...but...there's always this ^^^
Jun 19th 2018, 04:50 AM   #10
 
  Mar 2018
  Gig Harbor

  2008 BMW R1200GS Adventure
Sorry. Sorry. It’s been a busy week.

Tire pressure was low, but still had more play while I was riding than I liked. Decided to torque up the spokes and I was glad I did. A lot of them made multiple turns before the torque wrench popped.

Took out a lot of vibration that I had written-off as normal. Seemed to be a combination of the two issues.
Jun 19th 2018, 07:25 AM   #11
 MarvTravis's Avatar
 
  Jan 2016
  Kirkland, WA

  Kawasaki ZX-14
Good to hear you resolved the problem(s).
Jun 19th 2018, 02:12 PM   #12
 
  Mar 2018
  Gig Harbor

  2008 BMW R1200GS Adventure
Quote:
Originally Posted by Motorbiker
Some bikes are prone to this phenomena when the rear tire gets worn flat due to more straight line riding. (Commuting). Usually not noticed unless you "shake" the handlebars back and forth or take both hands off the bars. Don't do that!
Iíve got some of this going on as well. I can tell the middle is wearing faster than the sides just by looking at it. Need to hit some twisty roads.
Jun 20th 2018, 10:40 PM   #13
 That One Guy's Avatar
 
  Jan 2016
  Beaverton

Also a good idea to check the steering head bearing
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