Join Date: Mar 2007
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You are on the right track...checking the grip/throttle tube interface is a good place to start. Try removing the grip and see if the throttle frees up. Make sure the throttle tube is intact and there is no grit, old grease, or dirt in between the tube and the handlebar. Make sure the bar end is not binding the grip/throttle tube. Also, make sure the ends of the cables, where they fit into the throttle tube, are not frayed or gooked up with old grease or dirt. If that doesn't work, take off the control housing and check the action of the cables...does the spring snap back without the housing and tube in place? If the cables are still not freed up, I would carefully inspect the cable sheath for damage...esp. near the steering stem. Also, check the routing (esp. considering it was "crashed") and make sure it's not binding...check with the bars all the way left and all the way right. If it's still not working right, try lubing the cables.
If still no joy at this point, you will need to get access to where the cables connect to the throttle bodies. You're going to need access to check the return spring and/or to replace the cables, so just deal with it..heh ;). Anyway, check the action of the return spring and at that point, you will know if it's the cables or the spring or something else gone awry in the throttle bodies.
Have fun and let us know how it turns out....or I guess take it to a shop.