Rivet master link is PITA first time. But it does not need to be opened until replacing it.
Important to find hollow master link, solid need a more expensive tool. I bought one for both kind of links 2013 and has not used it again until last week when my other bike got a new chain.
I remove front sprocket with chain on and slide it backwards which is enough slack to lift it from rear sprocket for removal of rear wheel. I have done it with 4-1 as well as stock 4-4 exhaust.
No problem to pull engine and back again.
I often think about the old o-ring chain with clip master link. Much easier.
The chain I have on my K6, strongest 530 DC chain has stretched just a little after 15.000km. Equivalent with D.I.D 530ZVM-X which is overkill for a stock CB750. Maybe for a heavily modified too
The old o-ring chain D.I.D 50HDS from the 80's stretched a lot after 5000km. I had to adjust during longer tourings. I snapped one on Autobahn during heavy acceleration gearing down gears because of too much slack.
I'm sure all chains are much better today.
