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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 1 Week Ago
NGOT8R NGOT8R is offline
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Thanks guys! Lots of good information here. Keep it coming please.
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  #12  
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Will1250 Will1250 is offline
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Hey NGOT8R, I recently replaced my sagging standard mounts with DS mounts and thought about filling the voids with some sort of liquid rubber but decided not to because of the cost of the stuff (here in Australia) and it looked like the way the mount went together with the pivot arm meant it would be hard to achieve in my opinion. So I obtained some hard rubber in a block form and cut it to fit the mounts. This is what I came up with:



This is the rubber block:



With the inserts in the mounts (they were an extremely tight fit):



And what they look like on the bike:





Unfortunately I cannot at this point in time tell you how they ride as the project sort of grew and the bike is not back on the road yet.

Cheers, Will
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  #13  
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Nice job Will1250! That looks like it will either slow or prevent the rate of sag that is typical with the stock mounts. Please let us know how well they hold up and perform once you've had a chance to test them out
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  #14  
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Ireeman Ireeman is offline
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Did you Punch the bush, because cutting rubber is a bit of a bitch and certainly does not work in a wire EDM...lol.
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  #15  
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Will1250 Will1250 is offline
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No punching involved. The rubber is too hard for that. Appropriate sized holesaws however do the job nicely. Measure carefully and allow a little oversize as the mounts have a lip that you need to push the insert past to properly get into the cavity. It is a bitch to actually get them in there. A little rubber grease and a lot of bad language involved.

Will

Last edited by Will1250; 1 Week Ago at 23:30.. Reason: spelling
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That may help with sag, however; it shouldn't change the amount of vibration at all.

Note the outer diameter is what fits inside the casting on the engine block. The next ring with the tabs on it is where it mounts to the frame. That inner hole just floats around the axle and the only movement of the rubber should be between the outer diameter and that next ring that goes in the frame. The swing arm axle mounts to the frame and it doesn't actually contact the rubber mount at all under normal operation. That's why I consider it a myth that a sagging mount affects the swing arm. There is no physical connection.
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