Author Topic: Found a reasonble replacement for 91-92 K100rs steering damper  (Read 14372 times)

Offline Freelancer

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Found a reasonble replacement for 91-92 K100rs steering damper
« on: November 02, 2012, 03:59:36 AM »
After looking around and measuring, I found that the '04 GSXR 600/750 factory Ohlins worked with just a minor mod.

The damper I found on ebay for $200 us. It is the one that was mounted with a Hayes linkage mount.

The rear allen bolt was perfect but the suzuki front allen bolt was to large. Problem? Not really, turns out that the factory BMW allen bolt head was large enough and that a copper sleeve I made out of an electrical crimp connector (ac household connector found at Home Depot) made for a perfect fit.

The results?

After 6k it is still working like a charm and I now have a rebuildable and adjustable Ohlins steering damper.

Let me know what you think.

Later,
Freelancer
1991 K100RS

Offline frankenduck

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Re: Found a reasonble replacement for 91-92 K100rs steering damper
« Reply #1 on: November 02, 2012, 09:04:37 AM »
The K1100RS has the same front end (forks, fork trees, geometry and steering damper mounting points) yet BMW did away with the steering damper on the K1100RS so it doesn't seem to be necessary and may just be extra weight.
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Offline Freelancer

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Re: Found a reasonble replacement for 91-92 K100rs steering damper
« Reply #2 on: November 03, 2012, 12:36:34 AM »
Hi Frank,

I agree that the damper is not really "necessary" but its been my experience that a good one, set up properly, improves ride quality, comfort and safety.

The adjustable Ohlins unit that I now have on the bike is set to where it reduces the low speed flopping tendency when negotiating tight parking lots. The bike doesn't feel as heavy through the bars at low speeds.

Additionally, many Texas roads are constantly either being worked on or in need of work. When such work is being done, the asphalt is ripped up in a way that leaves a grooved gravelly surface that is wavy (sorta like a raked zen garden). The bikes handling can be, at best, described as nervous on these surfaces when riding without a good steering damper.

With the damper the bikes nervous behavior almost completely disappeared. The improvement was so drastic that my wife noticed the improvement from the pillon.

As to safety, the bike recently suffered a front tire blowout due to some road debris-
 (Large hardwood furniture not tied down ended up in pieces and in the middle of the road, driver turned around, pulled up beside his mess and had headlights pointing into traffic so that the danger couldn't be seen until you were in the mess.)
I hit a large chunk of shattered wood at a glancing angle. Imo, The combination of the pirelli sidewalls being amazingly sturdy and the steering damper prevented me from augering in. My riding experience probably helped, too, but I'm certain that the damper helped a fair bit.

As to your comment about weight.. :hmm:... I removed the ABS so I don't think the weight of the damper is huge.
Now before you think of me as totally insane :loco:, I had my reasons. The ABS had nearly killed me twice due to the pumps locking up at speed (Moisture in the computer connector - I ride in the rain and waterproofer wasn't holding up). This meant no brakes because the brake lever and pedal would not depress(hydro-locked). For a system that (imo) was never great and that I never used, it made sense to remove it. The damper gets used every time I ride, so it stays.

Again, I agree that the steering damper is not necessary and the oem ones didn't do much imo. Swapping to an adjustable unit has allowed me to set the handling of the bike to a point that I  like better. Ymmv

*Note to others here- I removed the ABS due to my experieces with the system. My choice should not in any way be construed as my advocacy of others doing the same. If it works for you then keep it.

Later,
Freelancer
1991 K100RS

Offline mjydrafter

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Re: Found a reasonble replacement for 91-92 K100rs steering damper
« Reply #3 on: November 13, 2012, 08:05:05 AM »
I would like some more info on this Freelancer.

Do you have any pics of the install?
1986 BMW K75c
1974 Suzuki TC-185 (the little 10 speed)

Offline Freelancer

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Re: Found a reasonble replacement for 91-92 K100rs steering damper
« Reply #4 on: December 31, 2012, 10:58:24 PM »
I would like some more info on this Freelancer.

Do you have any pics of the install?

Hey mjydrafter, sorry about it has taken me so long to reply. As to your question, I did not take any pictures during the install but will take and post some in the next couple of days. Ok maybe 3-4 days due to the rain down here.

Note to everyone else. when I got this damper I had the option of trying the Hyper Pro ones. They were somewhat unknown so I went with the Ohlins off of the 04-06 gsxr. Recent reportd from some local riders is that they are working well but will take a couple of years to know if they are durable.

I will re-measure and post the damper length with the pics I think it was 220mm but I've slept since then so want to be sure.

Later,
Freelancer
1991 K100RS

Offline mjydrafter

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Re: Found a reasonble replacement for 91-92 K100rs steering damper
« Reply #5 on: January 02, 2013, 09:36:14 PM »
No problem, FL.

Rain? Ha, ours has been all solid, 12" and white... :yow
1986 BMW K75c
1974 Suzuki TC-185 (the little 10 speed)

Offline Freelancer

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Re: Found a reasonble replacement for 91-92 K100rs steering damper
« Reply #6 on: January 04, 2013, 01:23:26 AM »
OK, The measurements are roughly as follows:

From center of piston mount to full stroke...10" or 255 mm

Just the stroke from lock to lock is 8.5-6ish inches or 215-220mm.

I admit that the damper might be 1 or2 mm shy of full lock to lock, it's hard to tell. When setting the mount I could get a minute shift when the rear bracket was loosened for adjusting.

Just realized that I tend to think that everyone knows how to do basic set-up.

First thing you'll need to do is to trim the black plastic on the underside of the fairing so that the Ohlins larger piston mount will fit

Second, you will need to make a barrel spacer/sleeve that removes the freeplay when you use the stock phillister screw with the larger Ohlins piston rod mount. I described what to use for this in the o.p..
The other options are to either:
a)have a custom screw made that has a thicker shank and narrower thread,
b)you could try drilling out and tapping the fairing mount(I do not recommend, not enough material there, imo.)
c)cut off the old mount and weld in a replacement(IMO, too tricky and not a simple/reasonable replacement at that point).

Third, you loosen the rear mounting bracket and slide all the way back so that you can insert the rear phillister screw(mounting bolt). At this point go ahead and mount to the factory mount on the fork.

Fourth, Slide the OEM screw with barrel sleeve shim into the piston rod mount and then attach to the fairing mount
(Note: With the front wheel on this is a PITA. No really, it is a pita when mounting the oem damper. It takes on a new level of try to get it aligned right, then try again, try again followed by an offering of a poetic haiku of expletives to the mechanic gods and finally it lines up right. Now, its not as difficult with the front wheel off but removing the front wheel adds a lot of time to the job.)

Fifth, Once the damper is mounted, turn the bars to the right until full lock then partially tighten the mounting bracket to the damper body.

Sixth, whatch the damper as you (or preferably a helper) slowly turn the bars all the way to left full lock. Make sure that the damper body does not silde until you hit full stroke. If it slides at full stroke only a mm or two your fine. Use a marker to note the 2 positions and split the difference and then tighten the bracket down.

Seventh, play with the adjustment until you find the right amount of damping for our tastes.

Note to all readers. I say that the suzuki damper may be a mm or two short. The reason that I say may is that I have gaiters on my bike and they hit the damper enough possibly be the cause of the nudging at lock. If any one is uncomfortable with the idea of the damper nudging at full lock then I suggest running one of the Hyperpro's that have the same mounting system as the Ohlins you will hopefully see pictured below.

Later,
Freelancer

P.S. Feel free to ask questions or let me know if I need to take a different shot. And yes, I know the girl needs a bath, I live down a red clay and iron ore drive so pls don't judge to harshly.
Ltr,
Fl

1991 K100RS

Offline frankenduck

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Re: Found a reasonble replacement for 91-92 K100rs steering damper
« Reply #7 on: January 04, 2013, 06:16:41 AM »
Freelancer: If your objective with your bike is to keep the weight down as much as possible then why are you installing a steering damper?  Even though the K1100RS has the exact same front end as the K100RS4V, BMW got rid of the steering damper so IMO it's really just extra weight and expense.

I did install one on my K1100RS because I had one laying around but, to be honest, haven't noticed ANY change in handling.

My K75 with a K1100RS front end doesn't have one and the only difference I noticed there was that back when it had bias ply tires it was a little squirrelly below 2 mph.  Once I installed radials that went away.
Once I had a Collie pup. Dug a hole and covered him up. Now I sit there by the hour. Waiting for a Collie-flower.
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Offline mjydrafter

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Re: Found a reasonble replacement for 91-92 K100rs steering damper
« Reply #8 on: January 04, 2013, 02:31:47 PM »
Hey Freelancer, thanks for taking the time to do the write up and for the pics.

Those Ohlins dampers are some serious coin. :yow

I recently put new steering bearings in and removed the fluidbloc.  I didn't get a whole lot of riding in with the new stuff, but she wasn't too squirrely, sans the FB. 
1986 BMW K75c
1974 Suzuki TC-185 (the little 10 speed)

Offline Freelancer

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Re: Found a reasonble replacement for 91-92 K100rs steering damper
« Reply #9 on: January 05, 2013, 02:20:32 AM »
Hey Freelancer, thanks for taking the time to do the write up and for the pics.

Those Ohlins dampers are some serious coin. :yow

I recently put new steering bearings in and removed the fluidbloc.  I didn't get a whole lot of riding in with the new stuff, but she wasn't too squirrely, sans the FB.

The set-up on my bike cost me $200 US off of Fleabay. I went and searched eBay under Ohlins steering damper today. You can find some or peice together what you need for about $275-300 US (same cost as the ineffective stocker is new). Just look for the one with the Harris bracket(The piece that clamps to the damper body and provides the rear mount) or buy one without a bracket and purchase a Ducabike bracket.

As to damper or not??? Personally, I prefer how my bike handles with a good damper on it but it is all a matter of personal preference. If you don't feel you need it the don't bother.
Pls note, my ride is a 91 4v with the wider rims. It handles a bit different than your 86 K75. Also, I believe that your bike doesn't have the mounting points that the '91 K100rs comes with.

Catch ya later,
Freelancer
1991 K100RS

Offline capthardcore

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Re: Found a reasonble replacement for 91-92 K100rs steering damper
« Reply #10 on: October 09, 2016, 09:51:28 AM »
Hey freelancer
What model Ohlins damper is this 030?
Is it still working, I still ride a brick, it needs a damper
Craig
  • 3284 Encinal ave. Alameda CA 94501
  • 1991 K100RS

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