Here's one.
If you have a 748/9**, check your bike carefully after riding over what British councils humourously refer to as "re-surfacing". Where they put down lots of loose chippings.
The chipping fly up and can rest in the recesses in the bottom yolk, next to the lock-stops. As they're tarry and sticky, they tend to stay there.
It's quite easy for them to jam in there against the lock-stop, so that the normal "limited lock" can easily become "no bloody lock at all"!
Not too funny the next time you come to a T-junction!
[Edited on 10-7-2004 by moto748]