I have a 99 400ex,just had it rebuilt,rode it for about 6 hours,and the timming chain came off the crank gear.So my question is,what do I line up to get it back in time.Had local shop do the rebuild,and don't want to take it back.Is there somewhere on the site that has it.thanks.

 

Simply putting it back on will not fix the problem and it's not worth trashing a topend over. I'm surprised you didnt drop a valve when it came off. The chain doesnt just "jump" off unless there is a problem. May have just been a worn out chain, but be sure to check over the tensioner assembly to.
As for the chain you have, it came off and isn't something you want to reuse once it pops off. Replace it with one for a CRF450.