read the manual?!
Had an XT550 a while ago and sold it w/ the owners manual and shop manual. Six months later I run into the guy, who says "You ripped me off! Every time I check the oil it's a quart down and when I put a quart in, it blows oil out the breather tube!".
Me: "Uh, did you check the owner's manual for the proper way to check the oil?"
Him: "WTF! I know how to check the oil!!"
So I explain it to him. Looks dumbfounded, turns and walks away, shaking his head.
Moral: You can give them the manual, but that doesn't mean they're going to read it!