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post #1 of 22 (permalink) Old 07-18-2019, 02:48 AM Thread Starter
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Clutch rebound rubbers

Hi All, Regarding clutch rebound rubbers are T150 part # T4324 (57-4324) the exact same size as # 57-1723 rebound rubbers that would be fitted to twins?

Some sellers are selling them as the same, but were they? Or is the 57-4324 just slightly larger & firmer?

Thanks,
Don

Last edited by TR7RVMan; 07-18-2019 at 02:48 AM. Reason: changed sentence
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post #2 of 22 (permalink) Old 07-18-2019, 07:04 AM
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Don..I don't know but I'm not convinced any of the repop cush drive rubbers are the correct quality..

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Last edited by Truckedup; 07-18-2019 at 07:18 AM.
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post #3 of 22 (permalink) Old 07-18-2019, 09:44 AM
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I'm sure just about every owner would welcome an answer on this, it's a moot point. Many a rubber (excuse the pun) I've fitted has turned to mush in no time. Seems someone may be making these at home from god knows what as OME. A thought that did occur was why has no one got round to these in Viton type material, it's available in 50 to 80 shore, that must cover the OEM range, perhaps better.?
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post #4 of 22 (permalink) Old 07-18-2019, 11:14 AM
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These Neoprene ‘rubbers’ have been resilient for me.

I should imagine the twin needs stronger rubbers than the triple as the power pulses are lumpier and less even.

http://www.britcycle.com/Products/571722etc.htm


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post #5 of 22 (permalink) Old 07-18-2019, 11:40 AM
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What about urethane?

https://www.ebay.com/itm/Triumph-T12....c100005.m1851

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post #6 of 22 (permalink) Old 07-18-2019, 05:37 PM
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Hi Don,

Quote:
Originally Posted by TR7RVMan View Post
are T150 part # T4324 (57-4324) the exact same size as # 57-1723 rebound rubbers that would be fitted to twins?
57-4324 from a German seller:-



... unfortunately, I can't find a similarly-dimensioned picture of 57-1723 but, if you have any, you could measure?

Two things suggest they weren't originally the same:-

. the twins used 57-1723 (and 57-1722) before the first triples right up to the very last (twins);

. the very first triples' had higher cush rubber part numbers, succeeding triples had even higher part numbers (including T4324/57-4324); if 57-1723 had worked, why wouldn't Triumph or NVT have used them?

Also bear in mind 57-4324 rubbers aren't just "rebound" on a triple, they're the same on the 'other' ("Drive"?) side too.

Hth.

Regards,

Stuart

Last edited by StuartMac; 07-18-2019 at 05:49 PM.
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post #7 of 22 (permalink) Old 07-18-2019, 06:07 PM
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I have had a few sets and found some to need a lot of force to fit and others fit without much leverage at all. Very variable but all work OK. They tend to break up in 3 years, often just 3 rubbers of one shape of the 6 Obviously a different rubber mix by the maker at the time. I have a fairly hard set in at the moment and it works well. The next set is already fitted into a clutch centre ready to fit and are the softer rubber. I expect them to work just as well as any other.

Now,where did that bit fall off ?
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post #8 of 22 (permalink) Old 07-19-2019, 01:52 AM Thread Starter
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Hi Stuart, That's what I suspected. I got the larger ones from Rabers a few years ago as they said some guys think they work better. I tried to install them, but the fit was too tight. The main problem was too long on the long ways. I got the normal ones too so I'd have choices.

I now believe the stiffer large ones are Triple buffers. They measure 17.3x25.9mm measured like the illustration you sent.

The twin ones I just bought 57-1723 UK made measure 16.8x25.3mm long.

The new UK made I just got are the same as the ones I put in last time. Very easy to install.

When removing them they were not very mushy like the rubber was heavily deteriorated, but were soft. I could very easily remove with pocket screw driver & push back in with just fingers without compressing anything.

I can force the larger rebound in but it's a real fight & the rubber bulges so much as to possibly interfere with the side plate clamping tightly so that's not right. Too tight.

My thought is to grind the too large rubber shorter & maybe profile a bit closer to the 57-1723 UK made ones.

Or get the red set from Canada. Have grand kids over for a few days so not much time to work on bike. I'll try to fool around with bike some more tomorrow night.

Really I'm putting perfume on a pig as the spider & rear cover are worn out. I just kind of want to see what happens. I filed the grooving out of slots last time & they are grooved again in 7k miles so maybe they do wear faster after you file them. I need a complete clutch of course. Long term I want to try to get another 5-10k miles out of motor, then complete overhaul with low compression pistons, all bearings, guides etc. The winter of 2021.

Stuart, thanks again for the info. Another mystery solved.
Don
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post #9 of 22 (permalink) Old 07-19-2019, 12:08 PM
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Recalling the efficiency of the cam sprung arrangement on the rigid frame models, has anyone ever come up with a better substitute than the rubber cushions?
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post #10 of 22 (permalink) Old 07-20-2019, 03:16 AM Thread Starter
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Hi Freakmaster, Many of the Harleys had the spring cush hub on crank & worked very well. Maybe rubbers are lighter & cheaper??

Many bikes have the cush hub in rear wheel. Those use rubbers. I believe modern Bonnie has that. Lots of Japanese do also.

The rear hub cush works good, but the rubbers go bad there too.
Don
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