Are the bars crooked in relationship to the triple clamp or is the triple clamp out of alignment with the front tire?
If the bars are crooked in relation to the triple clamp (a very common thing with CRs that have robber mounted handlebar mounts), loosen the handlebar clamps (both the pinch bolts that hold the handlebars and the nuts under the top triple clamp that hold the handlebar mounts to the top triple clamp).
Take the handlebar mounts out and see if you bent the threaded portion that goes through the rubber inserts. I have been able to fix crooked steering by making sure that both bolts were bent in the same direction. :)
If they aren't bent, they may have just twisted in the mounts and reinstalling them straight might fix your problem.
If the handlebars are in line with the top triple clamp but the triple clamp is out of alignment with the front wheel, loosen all 8 pinch bolts on the top and bottom triple clamps that hold the fork tubes. Wiggle the front end around until everything is straight. I usually do this standing in front of the bike, facing the bike, holding the front wheel between my knees while turning the handlebars. Be careful re-tightening the pinch bolts as they do not take very much torque...probably only 14-15 foot-lbs. I would suggest getting a service manual (not just the owner's manual) and use a torque wrench for this.
If the bars are bent themselves, it is a good time to consider Pro-Tapers.