Cush Drive Bushes

Flip · 16-05-2018, 07:57 PM

Okay good UKMOC folk just a quickie question for you....

What sort of age/mileage are people replacing the Cush Drive Bushes on your Monsters?

Mr Gazza · 16-05-2018, 08:05 PM

Not yet at 34000, but I have got some visible radial play on the sprocket, so maybe I will soon need pins and bushes?

Flip · 16-05-2018, 08:14 PM

Yes I've got a little play that sounds slightly metallic more like pin wear rather than cushioned movement if that makes sense?

So would change both while I'm doing it.

Mr Gazza · 16-05-2018, 08:32 PM

Yep. Same here. A metallic click when I jiggle the sprocket. So the pins are probably no longer a good fit in the bush's metal sleeves.
I'd be happy just changing the pins if that did the trick as I've heard that the bushes can be little scallywags to get out!!

Flip · 16-05-2018, 09:02 PM

Yes have seen they can be a nuisance to remove but surely the rubber will have hardened over the years and therefore will not really be cushioning anymore so just replacing the pins will exaggerate the harshness?

Mr Gazza · 16-05-2018, 09:14 PM

That's probably a good point, but I can't think that having the play in the metal parts is a good thing? Hard rubber or not.

The real McCoy would be polyurethane bushes if they do those bobbins in that material.
It's so much better that the "Rubber"! that is used in bushes of that kind.
I put Powerflex Polyurethane anti roll bar bushes in my Alfa and they made a great handling car even better...

I so need another Alfa..

Luddite · 16-05-2018, 10:00 PM

Quote:

Originally Posted by Mr Gazza

The real McCoy would be polyurethane bushes if they do those bobbins in that material.

Something like these, Mr Gazza?

https://www.ebay.co.uk/itm/New-Cush-...-/272984478887

Pricey mind you...

Mr Gazza · 17-05-2018, 04:35 PM

Nice find Luddite. Probably worth the extra, though not sure what standard ones cost.

Unfortunately those particular ones won't fit an old skool Monster, but if something like that is made for the old models in polyurethane, that does away with the metal to metal contact, I would go for it.

I believe everything in their blurb except one thing.

"25% less weight than OEM units!!! Provides smoother power transfer during hard acceleration and improves overall feel.
Unlike the stock rubber Ducati cush drives, these new ULTRALIGHT Hyper FLEX Polyurethane Cush Drive inserts have been engineered to give longer lasting performance, while withstanding contaminates that often destroy rubber. Polyurethane expands once compressed which in turn provides zero slop when under torque while also offering high durability. Compatible with all Ducati OEM and Aftermarket sprockets for singe side swing-arm."

How can something expand when compressed?

Flip · 17-05-2018, 07:05 PM

Quote:

Originally Posted by Luddite

Pricey mind you...

Quote:

Originally Posted by Mr Gazza

Nice find Luddite. Probably worth the extra, though not sure what standard ones cost.

Unfortunately those particular ones won't fit an old skool Monster

The price of those isn't too much different from the originals which are about £70 a set but I don't think they list them for the early bikes only the models that have a kind of cush drive/sprocket carrier it seems.

Not sure how much the pins are yet but will probably give MR a call tomorrow so will keep you all posted.

16-05-2018, 07:57 PM	#1
Flip Registered User Join Date: Mar 2010 Location: Beachtown Bike: M900 Posts: 2,188	Cush Drive Bushes Okay good UKMOC folk just a quickie question for you.... What sort of age/mileage are people replacing the Cush Drive Bushes on your Monsters? __________________ You're perfect, yes, it's true- But without me you're only you!

16-05-2018, 08:05 PM	#2
Mr Gazza Lord of the Rings Join Date: May 2013 Location: Norwich Bike: M900sie Posts: 5,806	Not yet at 34000, but I have got some visible radial play on the sprocket, so maybe I will soon need pins and bushes? __________________

16-05-2018, 08:14 PM	#3
Flip Registered User Join Date: Mar 2010 Location: Beachtown Bike: M900 Posts: 2,188	Yes I've got a little play that sounds slightly metallic more like pin wear rather than cushioned movement if that makes sense? So would change both while I'm doing it. __________________ You're perfect, yes, it's true- But without me you're only you!

16-05-2018, 08:32 PM	#4
Mr Gazza Lord of the Rings Join Date: May 2013 Location: Norwich Bike: M900sie Posts: 5,806	Yep. Same here. A metallic click when I jiggle the sprocket. So the pins are probably no longer a good fit in the bush's metal sleeves. I'd be happy just changing the pins if that did the trick as I've heard that the bushes can be little scallywags to get out!! __________________

16-05-2018, 09:02 PM	#5
Flip Registered User Join Date: Mar 2010 Location: Beachtown Bike: M900 Posts: 2,188	Yes have seen they can be a nuisance to remove but surely the rubber will have hardened over the years and therefore will not really be cushioning anymore so just replacing the pins will exaggerate the harshness? __________________ You're perfect, yes, it's true- But without me you're only you!

16-05-2018, 09:14 PM	#6
Mr Gazza Lord of the Rings Join Date: May 2013 Location: Norwich Bike: M900sie Posts: 5,806	That's probably a good point, but I can't think that having the play in the metal parts is a good thing? Hard rubber or not. The real McCoy would be polyurethane bushes if they do those bobbins in that material. It's so much better that the "Rubber"! that is used in bushes of that kind. I put Powerflex Polyurethane anti roll bar bushes in my Alfa and they made a great handling car even better... I so need another Alfa.. __________________

17-05-2018, 04:35 PM	#8
Mr Gazza Lord of the Rings Join Date: May 2013 Location: Norwich Bike: M900sie Posts: 5,806	Nice find Luddite. Probably worth the extra, though not sure what standard ones cost. Unfortunately those particular ones won't fit an old skool Monster, but if something like that is made for the old models in polyurethane, that does away with the metal to metal contact, I would go for it. I believe everything in their blurb except one thing. "25% less weight than OEM units!!! Provides smoother power transfer during hard acceleration and improves overall feel. Unlike the stock rubber Ducati cush drives, these new ULTRALIGHT Hyper FLEX Polyurethane Cush Drive inserts have been engineered to give longer lasting performance, while withstanding contaminates that often destroy rubber. Polyurethane expands once compressed which in turn provides zero slop when under torque while also offering high durability. Compatible with all Ducati OEM and Aftermarket sprockets for singe side swing-arm." How can something expand when compressed? __________________