hissing gas tank

[wikeke]

Just noticed that my gas tank hisses (08 ninja)...now i've done a little searching around, and found that kawi's are known for it
(read somewhere that most fuel injected bikes do it)

From all I've read, the hissing is usually noticeable after a ride...or if the temperature outside is hot...
(something about heat from the engine expands the gas, building pressure in the tank)

But I haven't ridden the bike this season (broken wrist). I got a pre-season tune up about a month ago, and she's been sitting there ever since.
It was not warm at all today (btw, the bike was not in any sunlight, it was in the garage all day)

I came home after work, and went over to the bike to see how she was doing...and that's when I heard a very low hiss coming from the gas cap.

I opened and closed the gas cap...and the hissing went away...but, it came back a few moments later.
After a second time of opening and closing the cap, the hissing stopped.

Anybody, have any insight on this "non-ridden, cold temperature gas tank hissing" ?

[kamikaze]

It did it on my 2010 for the 1.5 years I owned it. My friends made fun of it. Get used to it.

[Dr.Manhattan]

It's pretty much normal for the 250 Ninjas, sounds like a whale or dolphin call lol.

[Sushii]

Its normal.

[Cha0s00100]

It's pretty much normal for the 250 Ninjas, sounds like a whale or dolphin call lol.

This is why my Blue 09 Ninja was called Shamu ;P

[Garvarg]

Yes this can happen even without running the bike. Temperature changes from night to day can be enough to cause the gas in the tank to contract and expand. There is a pressure relief valve under the gas cap, its just a small rubbery thing and when dirt, wax and stuff get it dirty it will squeal instead of working quietly. Take a can of compressed air and spray around the underside of the gas cap and this will often get rid of the problem.
This happens to my bike whenever I overfill the tank.

[boooya]

It did it on my 2010 for the 1.5 years I owned it. My friends made fun of it. Get used to it.

That would be me
pool little thing sounds like its crying lol.

[wikeke]

thanks for the responses...

yeah everything I've read so far says it's 'normal' after a ride or in hot weather....I just didn't find anything about hissing coming from a cold bike that's been parked for so long.

btw it's a zx 6r...and the hiss was very low (had to put my ear right next to the gas cap to really notice)...nothing like a whale or dolphin call.

[Jay72]

My 2011 Ninja did it all winter sitting in my garage...there is a Ninja 250 forum that has a fix for it if you wish but it really isn't a big deal.

Edit: Damn sorry I missed the zx 6r part sorry.

[kickstartt]

my '06 zx6r hisses too, its normal

[kamikaze]

thanks for the responses...

yeah everything I've read so far says it's 'normal' after a ride or in hot weather....I just didn't find anything about hissing coming from a cold bike that's been parked for so long.

btw it's a zx 6r...and the hiss was very low (had to put my ear right next to the gas cap to really notice)...nothing like a whale or dolphin call.

tbh, this is the first i've heard of a zx6r doing it, but since it's still a kawi it doesn't surprise me that it does it.

[dontgiveajack]

When you say hiss, do you mean a 'wheezing' or whistling? Mine makes a faint, high pitched wheezing noise. Found out its normal on the 250.

I read on a forum about drilling some holes somewhere to help vent the air build up and quote: "no more gayest sound in the world!".

but who cares. just pretend it's your bike calling to be ridden

[killerkeith]

That would be me
pool little thing sounds like its crying lol.

I'd cry too if I was a bike designed for a life of abuse.

[dragonrider]

My 2009 ninja 250 hisses like no tomorrow. I kinda like it

[C-Note]

Screw what everyone says!

Step 1. Buy a new gas tank.

Step 2. When it hisses, repeat step 1.

Lol. It's normal. Don't worry about it.

[chiller]

if its a kawi and sounds like a bit like a fax machine that's normal ... :P

[kiwi]

goddam mother****en snakes in your fuel tank!

[wonderings]

Not normal, your bike is close to EXPLODING. If you give me $50, I will safely destroy it, in an environmentally friendly way.

[djbordie]

Just noticed that my gas tank hisses (08 ninja)...now i've done a little searching around, and found that kawi's are known for it
(read somewhere that most fuel injected bikes do it)

From all I've read, the hissing is usually noticeable after a ride...or if the temperature outside is hot...
(something about heat from the engine expands the gas, building pressure in the tank)

But I haven't ridden the bike this season (broken wrist). I got a pre-season tune up about a month ago, and she's been sitting there ever since.
It was not warm at all today (btw, the bike was not in any sunlight, it was in the garage all day)

I came home after work, and went over to the bike to see how she was doing...and that's when I heard a very low hiss coming from the gas cap.

I opened and closed the gas cap...and the hissing went away...but, it came back a few moments later.
After a second time of opening and closing the cap, the hissing stopped.

Anybody, have any insight on this "non-ridden, cold temperature gas tank hissing" ?

means its soon to implode.