The rings will take some time to break in, but my guess is you got a problem if its smoking that bad. Generally when i have put new rings in and started a fresh engine i let it idle for 15-20 mins before going any faster than idle, during that first run time it will intermittently smoke a little bit. Then i shut it off let it cool, double check the torque on the studs to make sure the gaskets are seating well that first heat cycle, then i start it up again and take it for an easy spin, varying throttle and speed, but no wide open throttle or heavy loading on the engine yet. Gotta break em in right.
If your getting that much smoke you might have to pull it back apart and see whats up! If you didn't replace the valve stem seals you should, but thats probably not the cause of the smoking your getting now.
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1984 Honda ATC200ES "Big Red"
1982 ATC200E "Hondie"
1988 TRX300FW "Project Quad" Still in progress....