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Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders Discuss Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders problems, advice, and/or how tos.

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  #11  
Old 12th May 2009
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Quote:
Good pictures so far. I want to see how the pivot assembly attaches to the frame please.
The rubbermounts have a metal backing plate that pushes against the sides of the transmission rear mount lug. There is a black metal retainer ring on the left side of the bike that compresses the rubbermounts together and against the side of the frame on the right.

You can see it in the 7th picture down from the top. The left passenger foot peg is bolted to it.
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Last edited by XLXR; 12th May 2009 at 05:44..
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  #12  
Old 12th May 2009
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Does the frame have a hole or something in it for the rubber mounts to fit in?

What I'd like to see is a picture of how the rubber mounts are held in the frame.

I see how they're held to the engine.
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  #13  
Old 12th May 2009
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Very informative so far.
Thanks to both of you...I'd have never even thought to look at this untill it started giving me problems..
Of course then it'd be a litttle late, huh???
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  #14  
Old 12th May 2009
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Very informative thread. Now, what I have been wondering. What if you replaced the rubber mounts, with some made of that polly stuff they use in up-graded car/truck suspensions. Seems to me, that would snug things up very nicely, and help to do away with the dreaded "wobble".
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  #15  
Old 12th May 2009
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Very informative! Did you use any lube like silicone or graphite when putting it all back together? IMHO, doping it up with silicone would be better than painting it. I would think paint would wear and become lodged in this area. This would help keep the water out and keep things lubed up and shouldn't effect the rubber.


Quote:
Originally Posted by cootertwo View Post
Very informative thread. Now, what I have been wondering. What if you replaced the rubber mounts, with some made of that polly stuff they use in up-graded car/truck suspensions. Seems to me, that would snug things up very nicely, and help to do away with the dreaded "wobble".
1st, polyurethane mounts are good but they do transfer vibration a lot more than typical rubber. 2nd, if you replace one piece of rubber with polyurethane you need to do all of them. Because the polyurethane is stiffer, it will transfer some movement and vibration to the non-polyurethane mounts causing them to wear faster and have funky movement.
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Old 12th May 2009
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Quote:
Originally Posted by biknut View Post
Good pictures so far. I want to see how the pivot assembly attaches to the frame please.
I know XLXR described how it mounts but I will take some pictures. I think I promised this originally...so thanks for the bump to my memory!

Quote:
Originally Posted by biknut View Post
Does the frame have a hole or something in it for the rubber mounts to fit in?

What I'd like to see is a picture of how the rubber mounts are held in the frame.

I see how they're held to the engine.
If you look in the original pictures, you'll notice there are two bumps (too early to think of something clever to call them!) on the rubbermounts that slide into the frame and the frame has specific "cut-outs" to clock the rubbermount and prevent it from spinning. I'll take some pics of what I am talking about shortly.

Quote:
Originally Posted by flourman View Post
Very informative! Did you use any lube like silicone or graphite when putting it all back together? IMHO, doping it up with silicone would be better than painting it. I would think paint would wear and become lodged in this area. This would help keep the water out and keep things lubed up and shouldn't effect the rubber.
My initial thoughts were to paint the rusted area on the rubber mount but the metal ring is someone incapsulated in rubber so I didn't want to mess with it. So yes, I applied some waterproof grease that I used to use on my snowmobile suspension components.
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  #17  
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I was hoping to take pictures before I installed the rear swingarm...but unfortunately in the fever of getting the bike back together I installed the rear swingarm, applied loctite and torqued the bolts already. I think we'll be ok though.

We'll start with the rear rubbermounts as they are a little different in design then the fronts. On the rear rubbermounts there is a metal ring built into it and the pivot shaft runs through this ring and rubbermount. Recall that the rubbermounts themselves have these bumps on them that located them in the frame and keep them from spinning of moving. You can see one of them here on the rubbermount (on the swingarm side):


On the throttle side of the bike the "hole" for the rubbermount. This is the same for the front rubbermount and is the reason why you install/remove the motor from the clutch side. The openings in the frame is designed to locate the bumps on the rubbermount. Here is a picture showing the two bumps and the rubbermount in the frame:




On the clutch side, the rear rubbermount is captured by a bracket you install after installing the motor. Here is a picture of the bracket (along with the pivot bolts that attach the rear swingarm) and you can better see the openings to locate the two bumps on the rear rubbermount:


Here is a picture of the bracket installed and bolted (2 places) to the frame:


The front rubbermounts have a little different design. The rubbermounts are basically opposite of the rear rubbermounts. The rubbermounts and the bumps on them slide into and are located within the front of the motor itsefl, not the frame. There is no pivot shaft on the front mount so they have metal tubes built into the rubbermount and these metal tubes actually are captured by the frame. Here is a picture of the front rubbermounts that I took when I had it apart. Notice that the front has one "bump" to locate it to the frame


Again, on the throttle side, there is a whole in the frame for the metal tube to slide into (sorry for the wiring in the way):


On the clutch side, just like the rear rubbermounts, there is a bracket that captures the rubbermount and the metal tube slides through it and mounts to the frame with two bolts:


Let me know if you guys have any other questions.
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  #18  
Old 12th May 2009
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Quote:
Originally Posted by XLXR View Post
What do you think caused the groove in the pivot shaft? Was it the metal backing plate of the rubbermount?
XLXR, it just hit me...could this be the origin of the wobble issue?? If the pivot pin starts to develop a "groove" from the wear of the metal washer in the rubber mount, this would cause excessive play between the frame and the "motor/pivot shaft/rear swing arm" assembly on the one side (in my case, maybe both sides in other cases).
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  #19  
Old 12th May 2009
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Are there stabilizer links at the top and front of the motor like on my Road King, that prevent side movement?

Are XR motors and swing arms mounted in the same manner?
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Quote:
Originally Posted by biknut View Post
Are there stabilizer links at the top and front of the motor like on my Road King, that prevent side movement?

Are XR motors and swing arms mounted in the same manner?
Biknut, I can't speak for XR's but there is a stabilizer link at the rear (just above the rear rubbermounts) and there is two at the front (one just above the oil filter and one up by the lower rocker box).
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