Bottom bracket is ticking Recently my 2008 Devinci mountain bike sounds like it's ticking when I push down on my left pedal on a usual rotation.  

When I turn the bike over and go through rotations, I can't get it to tick.

When I put my left crank all the way down &amp; jump a little on the left pedal, I don't get the ticking.  Only when I'm spinning.  

The ticking isn't 100% consistent, but probably about 80-90% of the rotations have this tick.

I took it to my LBS, but they just said it was a bent chainring tooth - which it wasn't.

Does this sound like this is definitely the bottom bracket?

Thanks.

Update: I took it into my LBS to get the BB taken out &amp; cleaned.  The tech said he couldn't find anything wrong with it, but did hear the ticking.  He greased &amp; lubed anything that moved, and the sound lessened quite a bit.  I haven't had a good long ride on the bike since, so I haven't verified if the sound has gone away.

Final update: Went for a good ride &amp; didn't hear the ticking, so it was likely the BB.
Bottom bracket noise is a frequent problem, and often hard to diagnose.

First and foremost, check the tightness of the crank bolts.  (Your LBS should have done this when they checked out the bike.)  A loose crank bolt can be the cause of BB noise, and failure to tend to the problem immediately (if not sooner) can result in irreparable damage to the crank arm.

After that there are a number of possible causes.  On a non-derailleur bike the chain may simply be too tight.  On a derailleur bike the chain may have a frozen link.  There may be a bent chainring tooth, or a deformed chain link.

Rarely, the problem can be due to bearing problems within the BB, but much more often with BB cartridges the cups have worked slightly loose and the cartridge is sliding back and forth in the housing (harmless and easily fixed).

On bikes with loose bearings (vs a cartridge) in the bottom bracket a loose cup can allow the crank to actually tilt slightly, such that the chain hangs up on the sprocket.  (This is easily diagnosed by simply grabbing the crank and shaking it -- there should be no bearing play detected.)

And pedal bearings seem (to me) to go out with aggravating frequency.

Then, of course, there's the "trick" knee or ankle that clicks sometimes.