Thought I heard/read somwhere that the particular kit is a 2nd size
over for a cb 500 to make it 555 cc. I used it on my 550 cylinders and had a slight over bore done. The one piece oil rings suck IMO. I STILL haven't had the inspiration to tear the motor back down after finishing the bike a year ago to replace them. Oil drips out of #3 exhaust. I've heard good things about that kit and bad things too. Wishing I'd used Genuine Honda.
If you've got oil dripping out of your exhaust port mate, it's more than the usual 1 piece oil ring problem. The problem with 1 piece oil rings is that the gap (as the ring wears) opens slightly, and will allow an occasional "puff" of smoke, as that minute amount of oil makes it's way up past the compression rings and ignites with the fuel/air mix. With three piece rings, there's never a gap, as the three seperate rings "mesh". If you've got a problem like you've described, it's more likely a broken oil ring.
They are very brittle, I busted one just fitting it to the piston, but providing that your "piston to bore" gap is within tolerance, and you don't have an unusually large ring gap, the oil usage should be minimal. I've got one piece oil rings on my 836cc race engine, and haven't noticed any problems, although Steve K0 thought he saw a "whiff" of blue smoke when I backed it off from speed with the engine cold when I was still "breaking it in", on one occasion. Honda used 1 piece oil rings for many years before their technology evolved, and most older "big bore kits" with one piece oil rings were early OEM Honda twin pistons and rings. Cheers, Terry.
