Both my 2007 and now my 2013 do this. Pretty sure it's normal.

 

Mine does this too, But If I don't fill it up to the top, It helps.
So try not filling it past the bottom of the neck.

 

My 07 never did this but my 13 does. Just fill it up the way you normally do, then at your first stop open and close the cap. Or just do as Old Dude said...your choice.

 

Fuel expands as it gets warmer and it also evaporates which causes pressure in the tank and it squeezes out through the cap. Both my '08s do it too.

 

You should hear a ninja 25o. Whistles like crazy.

 

Every bike I know of does that. What's really funny is when you are a new bike owner and you are trying to figure out what that weird 'whistle' is, what's causing it, if it means something is wrong et all. In retrospect, I remember spending a lot of time trying to figure that out. LOL. Good memories of being a nub.

 

My '04 250 did it, my '09 ex650r did it, and my '06 636 does it. Don't worry about it man :thumbup

 

I've seen pics & heard stories of tanks being damaged from expansion & contraction.

So it's not necessarily something to ignore.

 

Yes gas expands & evaporates, More so on hot days, try not to park your bike in the sun.

As I said in my first post, filling it to high makes it worse, as your not leaving much room for the expansion, & I think maybe blocking the vent line.??

I never fill past the bottom of the neck, Unless I'm on a road trip & know I'm going to run it out before it can expand.

Also when opening the cap to vent as someone suggested, be very careful, do this slowly, & watch where you put your face.


& if your parking it in the sun, opening the cap to vent it will only help for a short while & you will need to do it again.

So best you can do is not fill to far, & park in the shade.

 

Well thanks for the help

 

Completely normal !!!! ... it's just pressure escaping . Not to worry .

 

Haven't experienced this on my '02. But hey...

 

I had this problem with my 250. I just used. Drill to open the rubber vent and the problem was solved. It was a big problem because I would be driving down the highway and the pressure lock would kill my motor. Scary but I worked it out.

 

Yeah my 2022 does the same thing thought the fuel pump was running as it sounds the same.

 

Did you have to bring up an 8 year old thread to prove a point?

 

Wtf does it make a shit of difference to you for? Someone make you read my reply or what? And yeah these are 8 years old champ just saying they still have not fixed that problem if that's ok with you if not scroll on next time slick.

 

My gas cap squeals except it’s the thread on style cap, and it sounds like I’m cross threading it each time. There’s a vent tube under the tanks if you ever lifted it up you will find the hoses get pinched or flattened if not routed properly. 8 years or not, it was definitely a random post!


Sent from my iPhone using Tapatalk