Honda CBR 600RR Forum banner

1 - 9 of 9 Posts

·
Registered
Joined
·
212 Posts
Discussion Starter #1
Hello, a couple of days ago my mechanic had my valve clearance checked.
Since then i noticed every time i try to open the tank cap after some miles of riding that a vacuum is generated.

I never had this problem before and i know this should not happen. Is there a tube that allows air to flow in the tank or there is a valve in the cap of the tank ? What should i check ?
 

·
Registered
Joined
·
8,768 Posts
Hello, a couple of days ago my mechanic had my valve clearance checked.
Since then i noticed every time i try to open the tank cap after some miles of riding that a vacuum is generated.

I never had this problem before and i know this should not happen. Is there a tube that allows air to flow in the tank or there is a valve in the cap of the tank ? What should i check ?
there are two tubes coming off your tank (under it)

you will need to remove the tank cover, and pull back the fuel tank to get to them

one of them is kinked and preventing the vent form working properly.
 

·
Registered
Joined
·
2,429 Posts
there are two tubes coming off your tank (under it)

you will need to remove the tank cover, and pull back the fuel tank to get to them

one of them is kinked and preventing the vent form working properly.
Make sure you get that fix before your tank gets sucked in


Sent from my Motorcycle iPhone app
 

·
Registered
Joined
·
212 Posts
Discussion Starter #4 (Edited)
Is there maybe a diagram to understand which tube you mean ?
I remember that there is a big one on the left side but it does not go in the tank but it goes straight up to the tank cap if i am not mistaken.

Furthermore, as i drove like 1000km since then, could something get damaged by this ?
 

·
Registered
Joined
·
8,768 Posts
just pull the tank back, you cant miss it

you have id'ed one of the two already ;)

and not likely, BUT if its allowed to pull sufficient vaccume, it WILL crush your tank like a soda can, happened to a member on here last year.
 

·
Registered
Joined
·
212 Posts
Discussion Starter #6
I checked the service manual today and saw that there is also a sensor there, writing also a procedure. To be honest i did not understand what are those steps.

Could be something wrong with the sensor ?

 

·
Registered
Joined
·
541 Posts
Thats the MAP sensor Unless you having other problems with the bike since the work was done forget about that.

There are three rubber pipes that are supposed to exit the lower fairing/ bellypan right infront of the kickstand. Two bigger pipes and one small one.
The two bigger pipes are what you need to check one is for the filler overflow (Not the problem) the other is the tank vent. Trace the two pipes upto the tank making sure theyre not pinched or kinked anywhere.
 

·
Registered
Joined
·
212 Posts
Discussion Starter #9
Ok , i believe its fixed. The vacuum hose was kinked.
I just hope that this did not cause any problems to the pump.
 
1 - 9 of 9 Posts
Top