Old Dog said:
I know that with the aftermarket 4.7 Clarke Tank on mine it's hard to turn the bars all the way to the lock, making it a bit of a bitch to engage. I decided to start using caliper locks instead of fighting with it.
I have a Clarke 4.7 gallon tank on my XR650L and haven't had any problem engaging the steering lock.
Actually, when I got the bike last December I was unable to engage the steering lock with the key that I had been given. Apparently it was a copy made at a hardware store or something. So I went to the local locksmith (Bay Lock And Key in Dublin) and asked if he could make me a better key. He used a special tool to cut a new key, not a grinder, and made a new key that was way better than my "original".
So now, I turn the steering all the way to the left, push down a little on the key, turn it counter-clockwise some more, and it locks the steering with no problem (unless I try to use that one old original key).