I had a Clarke 3.3 gallon YZF tank on my bike for a while, the one that a lot of people here use on their WR's with the YZF style seat. I sold it to a guy (thanks to TT) yesterday and when he put it on his bike today he said there is a gas leak around the petcock. He took it back off and flipped the o-ring over and it still leaked, but not as bad. I never had any problem when the tank was on my bike. His bike is an '02 yzf426 so it seems odd that the 0-ring seal would be bad already, but I guess it is possible. Has anyone else had a problem with that?