I see that the singles had 530 chains but the twins only 520 so I'm guessing that width is limited. Has anyone done it?
Or make the ring up from Toolox 44 at 45HRc just normally workable on a lathe, is it available on the other side of the pond?I put a 520 O ring on mine. Not a big issue for width. I have had rings made from SAE 8620 steel and case hardened .020 deep with a 2.500 bore in 18, 19, 21, and 22T. I can then take an original counter shaft sprocket and re ring the splined hub. Both my A twin and the TTR (and my post war bikes) have been done this way. There are some of these sprockets with a documented 20,000 miles on them. I think I could even put a big fat 530 O ring in there and not touch anything.
Bill, It might sound a bit bizarre, but have you tried putting the bike on the rear stand and fitting an old worn-out length of 530 chain to establish what/where clearance issues you might have? Some rag or maybe rubber wedged to one side - and then the other - against the sprockets will move the chain over each way while you rotate the rear wheel by hand....
Peter B