Question about 2004 Yamaha FZ6
All gas tanks have a vent to let air in to replace the gas as you use it, ussually in the cap. Most have a one-way valve so air can get in but gas can't get out, you found out why when the bike went horizontal. But if the gas gets hot, it builds a bit of pressure and your vent is leaking slightly. That's the whistle you hear and why the fuel spilled. A new cap should fix it.
Posted on Nov 10, 2008
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