My steering is out of alignment.
I have to hold the bars off center to have the front wheel pointing straight.

The EX250 triple clamps are made of soft metal and usually bend in lowside crashes.

Since the bottom triple clamp is welded to the rod that goes through the steering head, they must move as a unit. The top and bottom clamp can twist relative to each other, but the act of twisting them actually bends the metal of the triple clamp.

The triple clamp is about 1/2" thick where the fork passes through. As the clamps become mis-aligned, the twisting action bends the metal where the fork passes through. If there were, say a ball joint where the forks passes through the clamps, they could swivel and not bent, but the clamp can only be straight when the top and bottom are perfectly alighned with both forks in the same plane as the steering head (like picture 1.) As soon as you twist one or both tubes, even a little, you are actually bending the triple clamp. Since the metal is springy, minor bends can be aleviated with a hammer or holding the wheel between your legs. Bigger crahses and bends will require a crow bar to resurect (like picture 2).

1. Slightly sticky suspension. Since the forks are slightly at odds with each other, they will not move as smoothly as if everyhting were aligned. Not too big a deal for street riding, but probably noticable on the track.
2. The bike will favor turning to one side or the other. Since the front wheel will be slightly out of alignment with the rear, the bike will turn better to one side. Again, may not be noticable, but still not ideal.
3. Finally, your fork bushings may wear out faster than they should due to additional forces placed on them.

1. Go to the hardare store and buy a piece of glass about 12" x 4".
2. Remove the front fairing and lower fairing on your bike.
3. Prop bike up so the front tire is about 2 inches off of the ground.
4. Slightly loosen the top and bottom bolts of the triple clamp where they secure the fork tubes in place.
5. Slightly loosen the axle bolt.
6. Then gently twist the wheel relative to the handlebars and re-tighten things when you think they're straight. Remember to check the height of your fork tubes above the triple clamp, as they will slide up when you loosen the bolts.
7. Now, place the glass across the silver part of the fork tubes, just above the black lower fork legs. If the forks are perfectly aligned the glass will sit flat against the tubes, if they are misaligned, the glass will rock back and forth. For small corrections you can leave th front wheel on and twist the bars while holding the wheel. If it is substantially twisted, remove the front wheel and fender, then get a BIG metal bar, or baseball bat and place it between the bottom of the fork tubes and twist left of right. That gives much more leverage than holding the wheel.
8. Repeat steps 6 and/or 7 until straight.

* I compiled this from several posts on the Ninja 250 Forum most of which were written by Doug Adler.