Top Motor Mounts/Stabilizer Links
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Outstanding HDF Member
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From: Philly Suburbs
Well I'll give ya that,,
I was just trying to help those that can't grasp it,, "grasp it",,
It seem's to me folks will read this thread and simply think that must change HD engineers/designers format because some guy off the street doesn't think that it's a good place for rubber mounts
I'm saying there may be a reason it's not already solid.
Do you think they saved money, by using a rubber bushing type mount instead of a solid heim?
I was just trying to help those that can't grasp it,, "grasp it",,
It seem's to me folks will read this thread and simply think that must change HD engineers/designers format because some guy off the street doesn't think that it's a good place for rubber mounts
I'm saying there may be a reason it's not already solid.
Do you think they saved money, by using a rubber bushing type mount instead of a solid heim?
I'm honestly not trying to argue, I did get your original point (and I really don't pretend to be an expert engineer whatsoever - or any engineer), but if we all just decided that the MoCo knows best, did everything the best way, had all of our interests in mind, and their choices shouldn't be altered... Well, we'd all have stock bikes and there would be little need for this forum!
You could just as easily say that HD designed the front and rear mounts without stabilizers, so we shouldn't add them... But many have experienced a night and day difference (in a positive sense) by doing so...
I do appreciate your comments, honestly. I only posted because I wanted input!
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From: poway
I understand the point you were making earlier, although I don't know whether it applies in the case of the top mount or not. But the shock analogy isn't really applicable (I don't think), because the shock mount isn't maintaining a critical point of alignment for half of the bike. With the exception of ride height, the shocks aren't really locating the rear wheel precisely within a plane. That's being done by the swingarm, which is located by the transmission case, which is located by the engine, which is located (in one axis) by this little link. I think the top mount actually plays a significant role in how the whole bike tracks on the road...
Or, I might be completely wrong... But it seems logical to me...
Or, I might be completely wrong... But it seems logical to me...
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Outstanding HDF Member
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From: Philly Suburbs
Very good but it does apply to the top link.. The motor/tranny/primary are trying to provide a stable platform for the swingarm pivot in a plane to hold the rear wheel aligned with the frame. It takes 3 points to define a plane.. The 2 lower motor mounts and upper motor define that plane. It's the main reason for adding links to the lower rubber mounts. The lower rear is not as important as the lower front tho.. I've found on my dyna that it's not needed tho some seem to think it helps.. What is interesting is that baggers like a lower rear mount tho. I suspect that is due to the weight carried low and attached to the frame..(the bags)
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From: Sandy Eggo's North County
Use urethane bushings, like sportscars use in their suspension.
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From: Murrieta Ca.
: Mike
Last edited by Nemosengineer; May 26, 2017 at 12:48 AM.
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From: poway
As far as spherical ***** on shock ends, it's OK and places where they can work well. Works use Delrin / Acetyl and Ohlins uses the sleeved rubber bushings.. I don't think the is enough space to use Urethane and the bushings would likely break a part.. When using Delrin, make sure the shock mounts are straight and line up. You really need to do a chassis alignment first then check shock mounts by bolting at the top and spacing at the bottom then bolting at the bottom and spacing at the top. Shocks need to line up pretty close.. If not you'll load the shock and blow the rod seal.. I blew a Works shock on a EGC that's lower and upper mounting bolts pointed outward on the left side frame (right was fine).. Ended up pulling top mount back to where is was close and bending / grinding the lower tap for the shocks to line up.. Some shock manufactures are using spherical ***** on their shocks. I suspect it's to deal with poor frame mount alignment. On my FXDX, when I added Works shocks to it, I was able to get the alignment real close..
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