The plain plates are of three different thicknesses, oh joy. I used only the two thicker ones. I must have put my Burman clutch in a safe place, because I can't find it, but I think it had five friction plates, and needed six plain plates. Or maybe it was four/five. I bought everything I needed (plates, bearings, springs) from VOC Spares. Basically you fill the drum up with alternate friction and plain plates, starting and ending with plain. (Hopefully they are also plane...) The last plain plate should sit just below the top of the drum, so that on full lift (although 20 thou is enough if all the plates are flat) the last one can't escape the slots. Two plain plates together matters nought, because they are both splined to the centre, and act as one extra thick one.
I have no plans to buy a "modern" clutch, there's nothing wrong with a Burman that new plates won't fix. It is basically the same as a BSA clutch - or a Honda, Suzuki, Kawasaki, Ducati...
I have a Burman gearbox booklet (includes clutch details) as a pdf file. Send your email address to sunbeam42@live.co.uk and I'll send you a copy. What you DO need to do is make sure yours is the Vincent version, with 5 springs, and not one of the superficially similar variations with four or even three.
I have no plans to buy a "modern" clutch, there's nothing wrong with a Burman that new plates won't fix. It is basically the same as a BSA clutch - or a Honda, Suzuki, Kawasaki, Ducati...
I have a Burman gearbox booklet (includes clutch details) as a pdf file. Send your email address to sunbeam42@live.co.uk and I'll send you a copy. What you DO need to do is make sure yours is the Vincent version, with 5 springs, and not one of the superficially similar variations with four or even three.