I have an early 850 that had been standing for a few years and on its the first proper run the clutch was slipping quite badly. There are 5 bronze clutch plates. The plates are 3mm thick and the friction pads 3.55mm. What is the limit of the thickness of the friction part? The edges in the pictures look a bit raggy but overall they seem to be good enough condition to me. In case I need to replace them I've had a look in the usual places and I couldn't find these bronze plates for sale. Could I replace them with ordinary 3mm plates?
Definitely no expert, but my…
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Aldi have rattle cans under…
Aldi have rattle cans under the heading brake cleaner, excellent for your purpose and it will save you having to purge your dishwasher should you be **** enough to go down that avenue.
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They look to be these after…
They look to be these after-market plates:
https://www.rgmnorton.co.uk/buy/bronze-clutch-conversion-with-5-hi-torque-bronze-plates_855.htm
although well chewed up.
850s have 5x3.2mm friction plates + 4x2mm steel plates + 6mm pressure plate (next to spring).
750s have 4x3.6mm plates. So maybe the PO has been experimenting.
Wash everything with petrol and reassemble - it should work for a while.
The stack (i.e. total of all plates) height should be be between 29.5mm and 30mm , see https://atlanticgreen.com/clutchpak.htm
Then you can play around from there to get it the way you want.
If you search on here you will find lots of information on the Commando clutch and its issues, alternative plates, choice of oil etc..
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Definitely no expert, but my two pence:
If the plates are oily or greasy, the hot program of the dishwasher will do wonders.
As long as there's (consistent) friction material height, would the thickness really matter?
Could the springs just have lost some of their power during time?
One thing you don't mention is if the plates are flat.
Good luck!
Tim