ZZR Whistling fuel tank?

[Wonko The Sane]

Just wanting to check if this is normal or not.

On a hot day, such as today, my fuel tank whistles slightly while the bike is parked, it sometimes does it after a long run.

It's only noticeable if I'm in a quiet area such my back garden where the bike lives.

I know it's the tank venting as it warms and air pressure changes, just wanting to check if it was normal or if it means a vent is blocked somewhere?

[ws4936]

Sounds normal to me.
Be concerned if the whistling changes to a tune you recognise, like "Happy Birthday" or something like that.
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If everything seems under control, you're just not going fast enough.

[SteveZZR]

If you attach a clean pipe to the breather on the back of the tank and blow with the cap open does the air come through?

I had a squeal type noise from my tank and it turned out I'd cocked up putting the breather back in and caught it under the seat so a blocked breather could cause this.

Does it sounds like pressure is being released when you open the cap after it's been 'whistling' ?

[Carvel]

My old GpShed used to do it after a run. It's nothing to worry about.
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[Pete.]

Shouldn't be that much volume moving through the breather so if it's whistling check it's not partially blocked.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[_mjs_]

I've noticed my ZZR does something similar... thought it was my ears ringing at first
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Previous Bikes: 2006 Honda XR125L > 2003 Yamaha DT125R > 1996 Honda CB500
Current bikes: 1997 Kawasaki ZZR 600 E5 > 2006 Honda Varadero XL125V

[johnsmith222]

mine does the same. I wouldn't worry about it as it's normal.

[RealNinja]

Very normal for ZX7R's too. In fact if you open the tank while it's doing it you'll get a 'ppffffffssshhhh' noise.
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[-Matt-]

My ZX6 does it, on hot days mainly like today, sun heating tank and making contents expand and gas release i've always figured

[hedgehugger]

My Ninja 250R used to whistle like a kettle @ the petrol station, at traffic lights, in fact anywhere it was hot and sunny and I was stopped it whistled. Annoyed the tits off me!!

Parting words from the guy we bought it off was... it's got that classic Kawasaki whistle...


I just like to think of my ex-Ninja250R whistling away under the woman I sold it to

[Ed Case]

My ER6F does it all the time, just expansion and contraction of fuel and tank.

[sgtcalle]

i also noticed my zzr doing this yesterday
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CBR600F '02
Manchester

[-Matt-]

Seems kawasakis like to play a tune is the conclusion from this thread

Add that to the kawasaki 'tick' and you have a marching band almost

[BigDan1190]

My Z1000 does it too

[-Matt-]

I propose with gather out re-fueled kawasaki's in hot weather and record an album

[SteveZZR]

[Wonko The Sane]

Not sure, when is the tick heard? might be something else I'd been wondering about.

My induction noise at 6000 rpm sounds like a jet engine spooling up

I have a vibration noise (presumed to be fairing / dash surround) at 5200 rpm

[hedgehugger]

Ok, so it seems a lot of Kawasakis whistle.
The ninja250 was black, don't know if colour makes a difference. I also have an er6 in silver that has never whistled.

[-Matt-]

Silver bikes prefer to sing, but only around christmas time

[Rogerborg]

GPZ500S and GPz305 both did it.
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[Irn-Bru]

My KLE also does it Kawasaki trait?
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KTM 990 SMT & Suzuki DR-Z 400 SM

[Hetzer]

My ZRX doesn't (at least that I've heard).
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[-Matt-]

I did notice one time when i took my ZX6's tank off - stupidly putting it upside down on the floor fuel trickled very slowly out of the cap - would it be expected to do that or is it perhaps a very slightly poor seal or something around the tank cap area, maybe common and causing the whistling

[BigDan1190]

Mine seems to do it more when lower on fuel on a hot day.

I don't remember my old GPZ500s doing it...

Definately appears to be a Kwak thing

[Wonko The Sane]