Okay, I assume you have this type of link:
Don't use it, it's bullcock, the little doo daah pings off because it gets knocked off by the cogs on the cassette (hapened to me, it sucks) then the chain falls apart when you're riding.
Don't use this either:
It's weak.
What you want to use is them lil' bitches that you have to bend slightly to get on, they really are good (the BMX type ones anyway), I'va had one for 6 months, no problem except getting it off, but anyway I reccomend either not running a split link at all or running one of those links I just decribed (cant find a pic sorry).