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Members: 664 | Total Threads: 50,905 | Total Posts: 519,138 Currently Active Users: 1,333 (0 active members) Please welcome our newest member, nellie691 |
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08-03-2019, 09:15 PM | #16 |
Registered User
Join Date: Dec 2010
Location: Leeds, West-Yorks
Bike: S4Rs
Posts: 497
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I’ve had poly ones on mine for a few years. Made by AFAM.
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08-03-2019, 10:17 PM | #17 |
You Are What You Is
Join Date: May 2005
Location: A Foward Location
Bike: S4r
Posts: 1,948
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My bushes came in a sleeve
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09-03-2019, 01:21 PM | #18 |
Lord of the Rings
Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,935
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I had a long chat with my chartered engineer friend this morning about altering the SSSA poly bushes to fit the Brembo wheel. To cut a long CV short, he has worked with Peter Williams, Lotus and the MOD among others, so he knows what he's talking about.
We came to the conclusion that cutting the poly bushes or altering their dims and surface is fraught with difficulty and brings uncertainty about their performance. Think about it.. Altering the volume of the shock absorbent material, alters it's shock absorbing property, by virtue of how much of it is left to absorb the shocks. Altering the wheel is also a very unknown quantity, without inspecting and measuring one in detail... Anyone on here willing to have a wheel machined out to try??.. I thought not. As far as I'm concerned this is too problematic a venture to bother with, given the high mileages that the originals put in and their relative cheapness compared to a conversion. We agreed that the standard bush material is very long lived and does not usually deteriorate by hardening. The time to worry is when visible disintegration is seen. Since the problem is in the play that seems to develop in the pin/bush interface. the cheapest solution suggested is to knurl the pins to take up the fit. It would only be necessary to knurl a short length of each pin. this could be done multiple times on different areas of the pin each time... I think we would be looking at well over 100,000 miles service out of the same bushes and pins here... My kind of fix...
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09-03-2019, 01:45 PM | #19 |
Registered User
Join Date: Jul 2014
Location: Norwich
Bike: Other Ducati
Posts: 109
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MZ's will do loads of miles, the rubber Cush drive (albeit managing lower output) suffer compression and shrinkage over time. I simply place a strip of thinnest steel shim every other pole and that takes up slack. That's what I'm generally doing with the SS.
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09-03-2019, 02:23 PM | #20 |
Too much time on my hands member
Join Date: Jan 2013
Location: Shipbourne
Bike: M900
Posts: 1,422
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[I]"Since the problem is in the play that seems to develop in the pin/bush interface. the cheapest solution suggested is to knurl the pins to take up the fit.
It would only be necessary to knurl a short length of each pin. this could be done multiple times on different areas of the pin each time... I think we would be looking at well over 100,000 miles service out of the same bushes and pins here... My kind of fix... " I think knurling will increase the wear as there will be fewer points/areas of contact with much higher load on those points - I would have them plated - anything that will take up the slack - copper / zinc / nickel / chrome. so long as the metal is harder than the rubber it should stay where it is put |
09-03-2019, 08:52 PM | #21 |
Silver Member
Join Date: Jul 2006
Location: Poole
Bike: M900ie
Posts: 503
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Interesting re; correcting wear of standard set up, but the later ploymer type cush drive bush/pins do offer the potential to loose a fair bit of rotating weight over the old type cush drive, with those heavy pins. Bitza.
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10-03-2019, 10:54 AM | #22 |
Registered User
Join Date: Sep 2012
Location: gloucester
Bike: M900ie
Posts: 133
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The recomendation is Silicone Grease I believe. Is this so?
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