Whilst on the subject of clutches...

[equipo5]

Mr clutch only takes up on the last mm of letting out the clutch lever. There is plenty of slack in the cable. I think I have made the mistake of not replacing the clutch spring as well when I replaced the disk recently. Am I right in thinking a new clutch spring is the solution here?

Cheers
Ian

[Bamboo812]

brain fart

[Airbear]

... and it may well be the diaphragm spring as you suggest. Did you happen to measure its height when you were in there? The original one in mine was a couple of millimetres below spec and the effect was a heavy feeling clutch with hardly any grip in reserve. A new spring from Motobins made a lot of difference.

[equipo5]

New spring it is. No measurements made at the time but thanks for the second opinion. I have a habit of buying the wrong parts.

Cheers
Ian

[ME 109]

Did the clutch lever function ok before installing the new friction plate?
Where did you get the friction plate from?
These clutches are quite sensitive to friction plate thickness.

If the clutch lever function was ok before installing the new plate, it should have been better with a new disc, not worse.
Maybe the new friction plate is the issue?

[Duane Ausherman]

You could use the website with an article just for your questions. It is my website. I think that it answers all of your questions with photos. Of course, some like to use wrenches and doing a job more than once is certainly OK, even good practice.

Go to http://w6rec.com/duane/bmw/clutch/ for more clutch information than you will ever want.

[Rob]

^
+1

[equipo5]

Thanks for all your input.
That was really helpful. I did my reading and pulled the clutch out today. The new (OEM) friction disk replaced an oil contaminated disk, both about 6mm. I had a feeling it had a bit more left in it previously but not 100% sure, I was just getting it on the road.

The pressure spring height is less than 18.5mm (Haynes min. for /5) at 17.5. But 17.5mm is in spec for r100's up to 1980 which is what I suspect is available from the retailers. the fingers look worn (see pic), as the worn one in Duane's web page, and unfortunately the pressure and cover plates have the rings of Saturn on them but I will see if I can get away with just a new heavy duty spring a this stage.

Thanks and Cheers

[SteveD]

Good stuff Ian.

It begs the question, when the clutch is out, what are the critical points of inspection and measurement to decide what to replace.



If it's all out but the clutch had been working fine, what are the data points that force a decision to spend more money?

Did you wanna ride to the Classic racing at PI this Sunday? It's a great spectacle.

[equipo5]

I cleaned up the spacers a little (with a file) in the hope to buy a little contact. Never know your luck.
Classic racing this weekend! - What a bugger, cant go, but thanks. (Didn't see it advertised but I did see Broadford classic racing weekend coming up Easter.)
cheers