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Re: The new clutch

Thanks for the input folks. Another stripdown looms. Thank goodness I've got the spring compressor tool.:face_with_rolling_eyes:

Re: The new clutch

I've improved things a bit but it's a bodge.
There's bad scarring on the contact area of the clutch basket where it contacts the fibre clutch plate. Probable corrosion in storage? I hadn't thought this would be an issue. But perhaps this is causing the drag? I've put 2 fibre plates in before the metal plate to hopefully reduce friction. I think this may have helped.
The basket from the old clutch is in reasonable condition & perhaps I'll try fitting this.

Re: The new clutch

Bob did you try Ian's suggestion of leaving one steel and one fiber plate out of the stack?

I'm currently fitting a Bonny clutch to my special for no other real reason than it's "cush" hub. I've ran this bike for 6000 miles on a standard M20 single spring clutch with two plate removed..... It's far more powerful than an M20.

I also run my WM20 (600cc) with the two plates removed.

I can't really think how the friction plates can hang up? More likely the steels if they are worn or a poor fit?? Ron

DSCF3240

email (option): ronpier@talk21.com

Re: The new clutch

Ron
Yes, I tried leaving out the two plates. It made no difference to the drag. I agree that it'd be hard for the plates to hang up but it was all I could think of. In fact I can see them moving when the handlebar lever's pulled in. I'll try the basket from the old clutch tomorrow & see what happens. Other than that I haven't a clue.
Incidentally, my pushrod was way too long to work with the 2 plates removed. Can you remember what length pushrod you use? Mine's about 12 13/16" though the bearing surface would be a bit less because of indentations at each end.

Re: The new clutch

Well I just prepared a new push rod for the Bonny clutch and the old one is still on the bench. It's 12 5/8".

Ron

email (option): ronpier@talk21.com

Re: The new clutch

Thanks Ron.

Re: The new clutch

The standard length for a WDM20 clutch pushrod is 12.740"-12.750", so nominally 12 3/4".

On that basis Ron's 12 5/8" would be about right with two plates removed as the thickness of one fibre plate (.093") and one steel plate (.048") is .141" ..Ian

email (option): ian@wright52.plus.com

Re: The new clutch

Well, I seem to've fixed things simply by fitting the spring from the old clutch. I know springs can be variable. I'd looked at the new spring & as accurately as I could measure it seemed true, not so it seems. But I find it hard to believe the new spring could be so bad as to cause that much drag. Repeating, I could pull the handlebar lever in & the clutch simply didn't work.
I've put all the plates in to fit the pushrod, I'll sort a shorter one & try taking out the 2 plates.

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