Join Date: Feb 2006
Location: Milwaukee, WI
Bikes: 2006 Kona Jake, 2005 Giant Lite Xtracycle, 2004 Trek L200, 1997 Specialized RockHopper FS, 1989 Trek 950
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Noticed this post in the forum header. Is this a Truvativ crank? I have a Jake, and had a similar problem. The left crank eventually came loose, and wouldn't stay tight after I cranked it down. Research "truvativ loose crank" in mechanics forum and google, and you'll find a consistent theme:
The crank and spline wasn't properly installed. Seems its not the mechanics, but the manufacturer didn't provide specific instructions that the crank arm needed to be seated to a certain level and visually verified in addition to torque.
I called the LBS I got mine from, and they said they'd seen a lot of them and that they'd order a new left crank arm (under warranty) right away as mine is probably damaged. If you get yours in quick, it might be an easy fix for them, but one I wouldn't try myself without the service bulletin.
Hope this helps.
Nothing says "in good times and in bad" like a good pair of fenders