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  #1  
Old 14th December 2019
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Default Rubbermounts, Stock VS Drag Spec

In November of 2013 I replaced my rubber mounts with Drag Specialties front and rear. That is on my 05 Roadster.

Since then the vibration to the bars has been just too damn much for me. I really feel the difference when I ride my 2005 Custom. Plus, ever since the swap I have chased noises that sounded and felt like early stages of rod knock.

Well, I bought a stock front rubber mount a year ago or so and have been looking for time to swap it out to see if that helps with the vibrations to my hands and also see if the noises get quieter.

I won't waste time complaining about why it took half the day to get it done other than to say that I found that the DS mounts were about a tenth of an inch too wide compared to stock. I finally beat it out with a large punch and the stock one fell right into place. While I was at it I replaced all the bolts that I had to remove with Allen Cap Screws Grade 8.

First impression from starting it and taking a quick spin around the shop is that when I parked it running I could actually see the engine rocking in the frame like it used to do so maybe that's a good sign.

My thought here is to have the DS mount in rear to maintain stability to the position of sprocket and swingarm. And hopefully the stock mount in front will get rid of most of the damn vibration.

It's been a long day so I am heading home now. I will come back and report on how this works after I get some time behind bars.
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  #2  
Old 14th December 2019
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Default

'Bout time you swapped that out. ;p
Thinkin' it'll make a significant improvement with just the one.
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  #3  
Old 14th December 2019
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Default

Fitting the top triple tree from an 03 or earlier, which rubber mounts the bars, helps too.
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  #4  
Old 16th December 2019
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Default

Well, this seems to be the cure.

I rode for longer stretches on Sunday and no vibrations. My hands never did go numb, and I also noticed that even in the cold morning with my hands stiff from the cold I was able to get my helmet buckle loose easily. That is usually an issue until my hands warm up a bit but the lack of numbness from vibrations seems to have eliminated that issue.

Today I took short videos of both bikes running. You can see the engine really shaking in the frame with stock mounts on my Mule, and you can see that the Pig is much less due to that rear DS mount. This seems to be the best of both worlds. Less movement of the rear sprocket, and no real vibes to the bars.

Now just need to see how it holds up over time.
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  #5  
Old 16th December 2019
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Default

Note: with two soft mounts, the pivot point for the engines rocking should be near center between mounts, and the crank rotation is forward of that by a bit (it's about 1/3 the distance from the front mount to the crank center).

With the stiff rear, I assume the pivot point would essentially be the rear mount and the front mount would travel up and down more than back and forth.

The video's I took seem to help that theory.

I am thinking that with the rotation of the crank being so far forward of the pivot point with a stiff rear mount there will be far less force trying to make it pivot anyway.

Not sure how any of this adds up, but it's all something to keep in mind if there is a failure down the road.

I think failure is unlikely because that stiff mount in the rear is making the front mount's travel less, so I assume less stress on the rubber.

We will see.
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