Pulled the transmission out of my 1985 K100RT today. The clutch splines have never been lubed so I thought it was probably about time.
Looking at the clutch plate it measires 5mm across the friction surfaces. The Haynes manual says 4.5mm is the wear limit but mine is nearly on the rivet heads.
Wondering how thick a new one is ?
Really I'm just wondering if I should just replace the plate so it's good for another 30 years.

ShedBob wrote:Wondering how thick a new one is ?

5,5 mm.

You're in there now, so renew it. Also do the engine output shaft seals and live happily ever after :-)

+1 to ReneZ. 

As a licensed mechanic I used to do a lot on cars. My rule of thumb was that if the engine and gearbox were separated, unless I had certain knowledge of a new clutch being put in recently, I put in a new one.

I haven't had my K apart that far yet, but when I do, I'll be doing what ReneZ has suggested.

Bill

Yeah I'd pretty much decided to put a new plate in anyway as it's such an awful job to get in there.
Don't want to do it again in a hurry.

ShedBob wrote:Don't want to do it again in a hurry.

Exactly why I always changed it.  

It's not only the plate thickness that's important. How are the splines??

Splines are good Rene.
Alternator shaft seal is away though.