How to tell clutch wear?

[jjwithers]

I have about 4 or 5 used clutch assemblies sitting around. Some are /5, others are /6.
I'm putting together a R75/5 mostly from spare parts and trying not to spend money if I don't have to.

How can you tell how much life is left on a clutch? Can you gauge the thickness of the pressure plate?
If so, what is a good vs worn amount?
Or is it the general surface of the pressure plate being worn somehow?

Is it safe to reuse the spring, pressure plate and compression ring?

-josh

[Bamboo812]

Duane's got you covered there: http://w6rec.com/duane/bmw/clutch/

[equipo5]

Just received my new clutch spring for my R75 from Motorworks today. It is 1mm higher (18.5mm) than my old failing spring (17.5mm).
I couldnt measure the pressure and cover plates but from Duanes site I gather the smoother the more contact area.

cheers

[jagarra]

If you measure the disc thickness the minimum is 4.5mm.

[jjwithers]

Douph! I should have checked Duane's site first.

Thanks for the helpful info and measurements.

-Jj

[PAS]

I would put a straight edge across the pressure plate to see how flat it is.