Bouncy Handling - BMW Luxury Touring Community
 
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post #1 of 20 Old Aug 11th, 2013, 10:52 am Thread Starter
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Bouncy Handling

I've just realised..having had a whizz around autoroutes in France that there is something seriously amiss with the handing. Short pottering in the UK lead me to blame the state of our roads but on longer runs the bike seems to "hobby-horse". I had the front seals done a while back and it might relate to that. Softening the rear damper helped but the movement leads to strained backs and a miserable passenger. Any thoughts welcomed.
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post #2 of 20 Old Aug 11th, 2013, 11:11 am
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Re: Bouncy Handling

Basic engineering:

1. Springs resist displacement
2. Shock Absorbers (dash pots) resist velocity change

If you are bouncing around I would say that your shock absorbers have given up their life
and you are ready for some replacement ones. The inability to tame the spring as it
compresses and uncompressed is a tough job - especially for such a heavy weight bike!

You have about 4 choices - BMW, Wilbers, Ohlins or Hyperpro

Dan Finazzo
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post #3 of 20 Old Aug 11th, 2013, 11:29 am
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Re: Bouncy Handling

That pretty well sums that up.................



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post #4 of 20 Old Aug 11th, 2013, 11:33 am Thread Starter
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Re: Bouncy Handling

I guess you mean the central one rather than the front forks. Could it be low oil level...read somewhere it can be topped up.

Last edited by beerbiker21; Aug 11th, 2013 at 11:36 am. Reason: additional thought
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post #5 of 20 Old Aug 11th, 2013, 4:26 pm
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Re: Bouncy Handling

How many miles on the bike. An there is a front shock which is hidden from view.

Travel safe. New SHOCKS WILL HELP.
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post #6 of 20 Old Aug 11th, 2013, 4:53 pm
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Re: Bouncy Handling

Quote:
Originally Posted by beerbiker21
I guess you mean the central one rather than the front forks. Could it be low oil level...read somewhere it can be topped up.
If adjusting the rear you feel NO resistance, then yes you can top up the oil. you have to fill the adjuster from the banjo hole where the hose connects to the shock.

http://www.youtube.com/user/illinois...?feature=watch One of the videos from the Illinois BMW Riders group covers this.

Currently riding a 2003 K1200LTC
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post #7 of 20 Old Aug 21st, 2013, 6:54 am Thread Starter
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Re: Bouncy Handling

She's only done 60k miles. Surely the units must last longer than that? Seen one for sale on eBay...done 169k! Any further thoughts? Am guessing that it's the hidden front one. My 1960 650 Triumph didn't have one at all!
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post #8 of 20 Old Aug 21st, 2013, 11:09 am
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Re: Bouncy Handling

Another alternative is HyperPro Springs on the old shocks, which I hope to do this winter. Much cheaper than whole new shocks and according to many does the trick. For around $350 that last I looked.

BMW 1200 LTC 2002


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post #9 of 20 Old Aug 21st, 2013, 1:42 pm
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Re: Bouncy Handling

One time, I increased the front tire pressure by 2 lbs, it stopped the hobby horse feeling. Another time replacing the rear tire a Metz I had run a few thousands of miles in interstates so that it was waring pretty flat in the center with a new B'Stone.

Another it was playing around with the front adjuster on an after market shock that stopped the rockin after I set the rear adjust for a stiff vrs soft ride.

Bob

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post #10 of 20 Old Aug 21st, 2013, 7:14 pm
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Re: Bouncy Handling

Shock absorber life is a lot shorter than most people think. I would seriously consider replacing at about 40K miles, sooner if problems develop, such as no oil in the rear shock adjuster. I replaced mine at about 20K miles for that reason (used Wilbers fwiw).

Current:
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2010 BMW R1200RT
Previous:
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2007 Yamaha FZ6
1986 Suzuki GS550L
1985 Suzuki GS650L
1977 Kawasaki KZ650
1975 Kawasaki F7
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post #11 of 20 Old Aug 21st, 2013, 7:39 pm
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Re: Bouncy Handling

they are gas struts same as on a car, with the spring off it should be very hard to compress and when you let go the rod should slowly fully extend, they put really weak springs on the bike for a soft ride and with 50K miles on mine the springs were nearly compressed all the time very little stroke left, bottomed out easily, Hyperpro springs fixed mine and it actually leans when on sidestand

Gary
2018 R1200RT
Past rides
2012 K1600GTL
2000 K1200LT
1992 K1100LT
2000 V Star 650/Velorex sidecar
1985 K100RT
1965 R60/2
1960 AJS 500 single
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post #12 of 20 Old Aug 21st, 2013, 9:46 pm
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Re: Bouncy Handling

So, what is the function of the oil in the rear shock?

Current:
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2010 BMW R1200RT
Previous:
1999 BMW K1200LT
2007 Yamaha FZ6
1986 Suzuki GS550L
1985 Suzuki GS650L
1977 Kawasaki KZ650
1975 Kawasaki F7
1973 Honda CB175
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post #13 of 20 Old Aug 21st, 2013, 10:31 pm
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Re: Bouncy Handling

separate hydraulic device applying pressure to spring raising bike - preloading spring

Gary
2018 R1200RT
Past rides
2012 K1600GTL
2000 K1200LT
1992 K1100LT
2000 V Star 650/Velorex sidecar
1985 K100RT
1965 R60/2
1960 AJS 500 single
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post #14 of 20 Old Aug 22nd, 2013, 4:00 am Thread Starter
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Re: Bouncy Handling

Thanks for that. A bit of research is clearly required before getting the wallet out. Which of the non-BMW are considered the best? Our local agent in the Surrey, UK cannot supply for at least 4 weeks claiming BMW have "a new system" which is causing supply difficulties. More likely they haven't paid their last invoice and are on stop!
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post #15 of 20 Old Aug 22nd, 2013, 9:29 pm
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Re: Bouncy Handling

A lot of LT'ers have changed over to Wilbers and love them... I'm one of them. Not the cheapest option by far, but makes a huge difference.
Your UK stockist might be http://wilberssuspension.co.uk/ or http://www.revsracing.co.uk/wilbers.php

As mentioned above, Ohlins or HyperPro (or just change the springs to HyperPro)... search the threads, there's a lot of discussion over the various types. There was also another 1 or 2 newer manufacturers in Europe somewhere... you'll probably find those names in recent threads on suspension .

Chris
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post #16 of 20 Old Aug 23rd, 2013, 10:06 am Thread Starter
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Re: Bouncy Handling

Am back on the autoroutes again...have adjusted the rear suspension and that has improved matters but it's not perfect..getting close tho.. so will have a look at the oil in the rear shock when I get back. Have suggested the wife might lose a few pounds off her ass but not sure if that went down too well! Thanks for the thoughts and advice on alternative shocks.
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post #17 of 20 Old Aug 23rd, 2013, 11:48 am
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Re: Bouncy Handling

Refill the rear pre-loader and replace springs front and rear with the HyperPro. She will ride like a totally different girl (the LT, not the wife!).

Antony (Tripod)
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post #18 of 20 Old Aug 23rd, 2013, 4:18 pm
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Cool Re: Bouncy Handling

I went to the HyperPro US distributor's website, and it looks like HyperPros for the LT include both the spring and shock. It doesn't look like they just sell the springs separately. What exactly are you replacing of the existing stock suspension components - is the stock preloader retained with the new HyperPros? Thanks!
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post #19 of 20 Old Aug 23rd, 2013, 6:31 pm
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Re: Bouncy Handling

Quote:
Originally Posted by JNW003
I went to the HyperPro US distributor's website, and it looks like HyperPros for the LT include both the spring and shock. It doesn't look like they just sell the springs separately. What exactly are you replacing of the existing stock suspension components - is the stock preloader retained with the new HyperPros? Thanks!
EPM Performance - you can buy just the springs

Gary
2018 R1200RT
Past rides
2012 K1600GTL
2000 K1200LT
1992 K1100LT
2000 V Star 650/Velorex sidecar
1985 K100RT
1965 R60/2
1960 AJS 500 single
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post #20 of 20 Old Aug 24th, 2013, 12:48 am
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Re: Bouncy Handling

Quote:
Originally Posted by beerbiker21
Have suggested the wife might lose a few pounds off her ass but not sure if that went down too well!
And you're still alive! You must be quick!

BMW 1200 LTC 2002


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