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Rubber dampers

Modern 961 Norton Commando Motorcycles

Rubber dampers

Postby Raphi » Thu May 12, 2016 1:14 pm

Following picture shows the third set of rubber dampers and I have to change them again now with 18'000+ miles on the clock.
Image
Does anybody know about similar problems and how to prevent this?
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Re: Rubber dampers

Postby TonyA » Thu May 12, 2016 8:29 pm

I have not seen this yet .. This would be a good question for the factory. Maybe a misalignment .? We should ask Richard-7 if his Dad had the cush drive rubbers go out . His bike had enough miles to ask.

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Re: Rubber dampers

Postby Britfan60 » Fri May 13, 2016 5:57 am

That is new to me. What are the symptoms?
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Re: Rubber dampers

Postby richard-7 » Fri May 13, 2016 7:58 am

First time I've heard of this. sorry.
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Re: Rubber dampers

Postby DBono » Fri May 13, 2016 10:19 am

I had this issue on mine at around 4,000 miles. Was replaced under warranty within a couple of weeks as new wheels were located in SoCal. Got new wheel and tire.

Was told by the factory that some productions of the dampers were not up to spec for rubber quality.

I noticed the issue on my bike as small pieces of rubber were visible protruding from the space between the wheel and spacer.
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Re: Rubber dampers

Postby Britfan60 » Fri May 13, 2016 10:28 am

What were the handling symptoms? A shimmy? Vibrations?
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Re: Rubber dampers

Postby Raphi » Fri May 13, 2016 10:39 am

You notice it when holding the rear wheel with one hand and moving the drive sprocket back and forth. If you notice a backlash you can estimate the grade of ware of the dampers.
When driving you can feel during acceleration a certain jerkiness of the bike...
I hope I could explain.
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Re: Rubber dampers

Postby Raphi » Fri May 13, 2016 10:41 am

DBono wrote:I had this issue on mine at around 4,000 miles. Was replaced under warranty within a couple of weeks as new wheels were located in SoCal. Got new wheel and tire.

Was told by the factory that some productions of the dampers were not up to spec for rubber quality.

I noticed the issue on my bike as small pieces of rubber were visible protruding from the space between the wheel and spacer.

How many miles you did with the new dampers by now?
I hope, I have now good quality ones ...
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Re: Rubber dampers

Postby richard-7 » Fri May 13, 2016 10:58 am

I'll check the bikes at home for this and report back. Thanks for the heads up. This is great info.. :mrgreen:
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Re: Rubber dampers

Postby TonyA » Fri May 13, 2016 11:17 am

DBono wrote:I had this issue on mine at around 4,000 miles. Was replaced under warranty within a couple of weeks as new wheels were located in SoCal. Got new wheel and tire.

Was told by the factory that some productions of the dampers were not up to spec for rubber quality.

I noticed the issue on my bike as small pieces of rubber were visible protruding from the space between the wheel and spacer.


Hello Dbono , Nice to see you back on the forum . How many miles have you done on the new cush drive rubbers and are they still good ? Thanks , Tony

Oh I see same question by Raphi...

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Re: Rubber dampers

Postby DBono » Fri May 13, 2016 3:31 pm

I've got about 7,000 miles (3,000 miles more) and no issues since.
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Re: Rubber dampers

Postby Raphi » Sat May 14, 2016 4:02 am

DBono wrote:I've got about 7,000 miles (3,000 miles more) and no issues since.


Maybe I had a bad second set when changed first time at about 12'000 miles. That is to say this second set (stock dampers from Norton) lasted less then 4'000 miles and looked even worse than the ones in above picture when changed. The ones in above picture were thus the third set of dampers and I made a bit more than 2'000 miles with them. This last set was not from Norton, but a prototype from SBN. Now I let mount stock dampers again and hope they last longer...
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Re: Rubber dampers

Postby TonyA » Sat May 14, 2016 5:20 am

I have never had mine off yet. If they last at least 20,000 miles this will be equal to a Xring chain and sprockets life.? Or what can you expect to get out of a chain and sprockets these days with good maintenance ? Then replacing them with a new chain and sprockets doesn't seem so bad. BUT if the sprocket carrier stubs do not insert deep enough into the rubber damper this will keep happening. I think the rubber dampers should be twice as long as they are with a correspondingly longer sprocket carrier stubs to work in them. That engine makes a lot of torque and give them a workout. And I suspect if the bike is ridden gently they will last longer .. This cries for an upgrade !!! Especially for those with a heavy right wrist....

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Re: Rubber dampers

Postby TonyA » Sat May 14, 2016 5:37 am

Hello Raphi , Is it possible that the sprocket carrier stubs are not fully engaged into the rubber dampers ? For example is the bearing in the wheel hub not fully driven into the hub ? This might cause the sprocket carrier not to fully engage the buffers. ?

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Re: Rubber dampers

Postby richard-7 » Sat May 14, 2016 6:58 am

Just checked SE107 with 15,000 miles. Little bit sloppy. Nothing too bad. Thanks for the heads up on this issue.
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