Join Date: Jan 2007
Location: Derby, Vermont, USA
Seen it happen to both street and dirt bikes, last time was two weeks ago on a clip that I put on myself. The kid crashed on his way home, laid the bike down in gravel and clip came off (dirt bike, brand new chain.)
I must say I have never had this happen with a DID or Regina chain. Their clips seem to be more spring like, and seat positively.
My best recommendation is rivet your chain. The next best is to apply some RTV over the masterlink/clip.
Unless your alignment is really off (uncommon), or your chain is too tight(common). then these need to be addressed.
2006 749S (resurrected)
1995 900SSSP/track bike
2001 750SS/"rain bike"
2005 CR85R (for sale, still)