[Fairly Dim]

When I arrived at work this morning and turned off my '03 ZX6R, it was making a strange high pitched whistling noise - it sounded like it was coming from the petrol tank. The bike was quite hot, but not too hot. It carried on for a minute or so and then stopped. Any ideas? Is this normal? Help!!!

 

[swjohnsey]

Yep, that's normal. It is coming from the tank vent that equalizes pressure in the tank. It is most noticeable on hot days.

 

[Miami636]

Yeah, thats why when filling up your gas tank do not cap it off. The pressure builds and you could end up with a lap of gas.

 

[Blue636]

It's called the "breather"... it's normal and nothing to worry about.

 

[Fairly Dim]

Thank you for that - it's reassuring I'm not about to blow up!!!
FD