Go to a reputable Triumph vintage parts dealer and see what they offer as a replacement chain that meets OEM specs. Then go to that chain manuf's website and look up the specs.
I remember Froggy, Morris. I did not know until now that he died at 16. How said is that. The fact that he died riding a motorscooter makes him a kindred spirit.
Ok : 76' T140. I replaced the stock 20 teeth front sprocket and the 47 teeth rear sprocket. On the old ones, I could use the 106 links chain. On the new sprockets, no way and it took a brand new 107 links chain to make it work. The manual is wrong for that year, and it does take indeed 107 links to install a chain, yes the one with the weird half link.
A chain with an odd number of links needs the 'cranked' link.
But, you never answered your own question:
What type of chain fit without clearance problems hitting the crankcase?
'Uber' by any chance?
Just a regular 530 chain, really. I ended up not using the 106 links RK-M chain I first bought, but a 107 links Diamond chain from raber's in San Jose, CA.
