SOHC.co.uk Forums > CB350/400

Clutch basket cushion rubbers

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ka-ja:
Amongst other things, he used to do a fair few bits for 400/4 road racers, here is the web site
                                     ttr400.com

ttr400:
Update on the clutch damper rubbers.

Yes i am always busy:) Plus it has not been at the top of my list.

I have tested many different materials and most have not held up. (tested by heating up engine oil). i have also bought cush rubber kits on the market for modern off road bikes etc and some of them also did not hold up to testing. the best material so far has been Viton.

Unfortunately being down here in Darkest Africa  no one suppliers this in the correct thickness, i just had a quote last month for the min qty of 1 sq metre at a cost of around GBP2500-3000 with import duties etc. so definitely won't be making any $'s from this.

As I am now getting a few emails for these kits. i have managed to find some Viton in smaller qty's. (but still have to import it). plus i also need some for my own bikes. when the material gets here i will do a few kits.

Couple of years ago i made some using Ertacetal, much harder with no give, so does not really act as a damper, but worked fine. (not tested for big mileage) would not be happy supplying these to paying customers. if anybody would like a set free of charge to try, (just cover postage) let me know and i'll put some in production for next month.

Yes i still do many parts for racers and road 400's. plus a few new parts that are not yet on my website.

Kevin

vehmulski:
Thanks for update Kevin,

Viton seemed to be the way to go so I have ordered a small sheet (200mm x 200mm) of correct thickness (10mm) and will have a go at fabricating one set to try. I,ll feed back on results.

Thanks all for input on this.

Mike

Clem2112:
I bought a set of the 'prototype' dampers from ttr400 about 4 years ago.
Still have the jiffy bag in the garage with S.A. stamps on it !
Since my bike has had so little use since I will have to strip the clutch again to take a peek !!
From memory the elastomer used was a blue moulded shape to match the original type.
My clutch needed rebuilding in any case as one of the rivet heads had sheared off.

vehmulski:
My original ones are black in colour, don't know the material Honda used or obtained in production.
As I have not been able able to find any "off the shelf" items suitable, I'm currently working on having a die and punch fly press tool made from gauge plate to be able to fabricate some new ones from "Viton" sheet. I will feed back on success when iv'e tried some.

Regards
Mike

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