One more question.
Is it a good idea to leave out 2 plates (a steel and a friction) on your single spring M20 clutch ?
I want to give it a try, maybe it helps in my endless struggle with false neutrals.

Aloha,

Make sure the clutch rollers are 1/4" x 1/4". I was sold longer ones and the clutch did not work, tried every possible remedy before it dawned on me while I was calmly looking out a train window what the real problem was.

Best regards,

Simon

I had the same problem as you. First the rollers in the clutch basket were the wrong size, original spring was not straight. Bought a NOS one and had the same problem...

Then I bought this:

https://www.thb-support.nl/product/bsa-m20-koppeling-centrale-veer-vervangings-set-15-4311-15/

Works perfect! I can pull the clutchlever with one finger.

Or get a complete kit with modern kevlar plates:

https://www.thb-support.nl/product/bsa-m20-complete-kevlar-koppelingsset/

It's not a modern bike, feel the pedal as you move it. Get pressure on the lever until you feel it engage.

Mark

email (option): pes.sales@btconnect.com

Yes, leaving out two plates is a good idea as it allows more room for the plates to seperate but has no adverse effect on the operation of the unit...Note that original fibre plates are .093" thick when new...Many pattern plates are too thick by quite a margin..In that case removing two plates will restore the plate 'pile' to the original height but won't provide any more clearance than the standard set up....Ian