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-   -   Polyurethane Skidplate Isolators? (http://www.advrider.com/forums/showthread.php?t=782102)

Dorito 04-15-2012 02:01 PM

Polyurethane Skidplate Isolators?
 
Does anyone make aftermarket Skidplate isolators out of poly urethane?

Here's the BMW branded info:
02 71 60 8 526 643
SET: MOUNTING PARTS SET
http://www.maxbmwmotorcycles.com/fic...g?rnd=17024232

epicxcrider 04-15-2012 06:14 PM

For what reason? Just curious.

Dorito 04-15-2012 06:22 PM

Just got done tearing off the rubber ones (and yes, still got a hole in the oil pan). Two: most "modern" bushings on cars/jeeps are polyurethane. Three: Some folks report tearing the rubber ones anyhow during routine maintence.

BTW, off to see if these will cross-reference:

http://www.bestrestproducts.com/p-23...-bushings.aspx

GH41 04-16-2012 03:39 AM

"Some folks report tearing the rubber ones anyhow during routine maintence"
How do you do that?? GH:ear

Dorito 04-16-2012 03:48 AM

Well, I don't make the news, I just read about it:

http://www.advrider.com/forums/showt...ght=skid+plate
http://www.advrider.com/forums/showt...ght=skid+plate

I suppose there are other threads too..

XTrooper 04-24-2012 12:09 PM

Polyurethane Skidplate Isolators?

If someone made them, I'd buy them.

GH41 04-24-2012 12:41 PM

If someone tears the factory isolators up doing maintenance the were using the wrong tool or the right tool the wrong way! Polyurethane bushungs are used on performance auto suspentions to better control geometry. They are less compliant than most rubber. That is probably the reason they don't us the to mount a skid plate. The harder the mounts are the more likely you are to break the oil pan. Think of them as four little shock absorbers. They were probably designed to be the weak link. You could just bolt the bash plate on with some aluminum spacers between it and the oil pan and solve your problem untill you hit the next rock! GH

GH41 04-24-2012 01:02 PM

BTW, http://www.vibrationmounts.com/Store...FQ/VM01029.htm Google is not very hard to use if you know the name of what you are looking for. GH

Dorito 04-24-2012 01:05 PM

Quote:

Originally Posted by GH41 (Post 18533338)
. They were probably designed to be the weak link. You could just bolt the bash plate on with some aluminum spacers between it and the oil pan and solve your problem untill you hit the next rock! GH

Technically, the isolators are designed for compression forces and not shearing forces. The shearing force for most of them in under 10 lbs. Doesn't really take all that much to rip them off a 400 lb bike traveling at any sort of speed.

Quote:

Originally Posted by GH41 (Post 18533474)
BTW, http://www.vibrationmounts.com/Store...FQ/VM01029.htm Google is not very hard to use if you know the name of what you are looking for. GH

Those don't come in metric sizing. Needs a M8.

JoelWisman 04-24-2012 06:51 PM

Other then unusual circumstance, the rubber mounts never see sheer UNLESS the skid plate bends or the front through bolt breaks.

I have seen both happen, and when it happens the rubber mounts breaking instead of jacking up the threads or ripping the bosses out of the oil pan is your friend.

What you are trying to do is ride the F800GS in a manner it was not designed for.

I have nothing against this as people trying to ride a 450lb bike like a dirt bike has been great for my yearly income, but I don't think poly mounts by themselves will do anything good for you, though at a 40% markup, breaking more oil pans is good for me :D

epicxcrider 04-24-2012 07:05 PM

Gotta agree with Joel and also say I'll keep riding it like a dirtbike :)

JoelWisman 04-24-2012 07:42 PM

Quote:

Originally Posted by epicxcrider (Post 18536120)
Gotta agree with Joel and also say I'll keep riding it like a dirtbike :)

Outstanding, would you like my business card :D

Maxacceleration 04-24-2012 10:18 PM

I think the need comes from some (me included) who have loc-tited their rubber isolators in.
There is no way to free them up once you have.

Intended use...lol
The way these bike are rode by some, bent bolts, bent brackets, shredded isolators and crunched skidplates will (and do) happen.

By the nature of many of us loc-titing everything, these isolators get stuck on.
Maybe thats where some feel a poly mount would be better. Or maybe a hex surface to grab on the isolators.
I do understand the nature of the soft rubber isolator and I agree that it is probably better at absorbing impact.
Myself I learned not to loc-tite the isolators or skidplate bolts.
Kind of a screwy system. But hey, its german.

On my 658 minimal ground clearance bike. :eek1
But the result can happen on the 800 too.
http://img.photobucket.com/albums/v2...n/P1020797.jpg
http://img.photobucket.com/albums/v2...n/P1020799.jpg

GH41 04-25-2012 03:46 AM

I guess I have to do everything for you. Here you go, http://www.vibrationmounts.com/Store...=Products1.htm GH

Snowy 04-25-2012 04:03 AM

Quote:

Originally Posted by GH41 (Post 18467121)
"Some folks report tearing the rubber ones anyhow during routine maintence"
How do you do that?? GH:ear

I destroyed a set because they had come loose previously and I Locktited them in.

Stupid, stupid, stupid.....so anyway, BMW wanted a Kings ransom for a full set, but one of the salesmen gave me a full set of new ones for free....well, I did spend about $20K there...

Since then, I use Locktite on the engine side, and anti seize on the bash plate side. The nuts come off no problems for service, but they don't come loose from the engine. I routinely use my rattle gun to remove and replace them.

I also destroyed the seat bridge rubber isolation mounts the same way, Locktite on both sides. After 6 weeks and $45 I got a new set and only use anti seize on them now.


Apparently not everything on the BMW likes Locktite.


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