Fuel tank breather NC29

[cbr400rrn]

Could anyone tell me or have any pics on where on earth the fuel tank breather is as i think the tank isnt letting air in to stop it pressurising. Its difficult to open the fuel tank cap when the bikes been run.
There are no other issues with the bike yet, but it is a pain in the arse trying to fill up at petrol stations and not being able to get the tank open.

[leopard_pagan]

it has no pipe outlet as it breathes through the cap, mine hisses at me in summer when i move the bike after being sat in the sun. it does have an over spill which is under the tank in to a rubber cup.

get a pipe cleaner and clean all round the cap..

[cbr400rrn]

When i say difficult to open we are talking 10 minutes of turn key and cap pops up slightly but i'm unable to just lift it up, i know it breathes through the cap but just wondered if anyone has come across it before and could point me in the right direction if you know what i mean.
How does it breath through the cap is what i would like to know

[tanuki]

there is a hole in it.

[Davez29]

Is it the vacumn stopping the cap from opening or could it just be the side catches? Sounds like it is to me if its popping up slightly. Open your cap, put a rag around the cap, spray with wd40 into the moving parts of the cap, inside and out, side catches, lock and hinge, push the catches in with your fingers to gain better access, turn the key also. My guess is, it will work after this.

[cbr400rrn]

there is a hole in it.

Cheers

It isn't the catches as i have cleaned them all and sprayed a little oil in there, they move freely and the key turns without a problem.

[Davez29]

It isn't the catches as i have cleaned them all and sprayed a little oil in there, they move freely and the key turns without a problem.

Very surprised hearing this, main reason being I just had that very problem last month, the catches were just gripping the edges, had to spray quite a bit to get them working fully. But I bow out gracfully and allow you find the answer.

[cbr400rrn]

It isn't the catches as i have cleaned them all and sprayed a little oil in there, they move freely and the key turns without a problem.

Very surprised hearing this, main reason being I just had that very problem last month, the catches were just gripping the edges, had to spray quite a bit to get them working fully. But I bow out gracfully and allow you find the answer.

No need to bow out my good man, thankyou for coming up with that idea. It will help if someone else has a problem like this and finds your post as theres not much regarding the Nc29 fuel tank issues yet.

[tanuki]

I had a broblem with a tank breather years ago on a GSXR, if your tank is presurising you will hear it hiss as soon as you turn the key, I dont think that is the cause of your sticky fuel cap as if your tank was presurising the fuel would stop flowing.

[cbr400rrn]

Hmm going to have to take it off and have a fiddle around with it me thinks.
Thanks very much