[mister c]

My son (the cheapskate) fitted a cheap non o ring chain on his CBF600, it lasted 1000 miles before it snapped on the M6 at 80MPH.
The original Honda chain gave him 16000 miles with no problems. He's now splashed out on a decent O ring chain & sprocket kit and has had no problems since.
Did you fit the new chain onto old sprockets? That will make the chain deteriorate faster than normal.