Weird problem. My mtb makes this clicking noise at the same spot when i pedal. It sounds like its coming from the crank but if i backpedal it goes away for about 5 minutes and then comes back. Is it a locked up link on the chain? It's making me crazy. Any help would be appreciated. Thanks.
Probably not a link of the chain. It really can be anything, but I bet it is on the crank arms, bottom bracket or even the crankset in itself. You should take your bike to a trusted mechanic, clearly explain your issue and make him ride your bike and feel the noise. It is probably something loose or a bit out of place.
If it were a locked up link on the chain, you would not hear the sound on every rotation but only when the link came around again.
I had this exact problem last week. Ended up removing the crank, unthreading the bottom bracket and cleaning everything up. I also re-torqued the bolts on the chainring. Lucky for me the sound went away.
As others have suggested, check the pedals and bottom bracket. Make sure everything is torqued correctly and clean.