Fuel tank breather blocked - SV650.org

11-07-19, 02:54 PM

Hey all, the fuel tank breather in the petrol cap is blocked on my 07 sv650. Ive taken the petrol cap apart and cleaned everythong twice but no joy. Any ideas if im missing something stupid?

glang · 11-07-19, 05:34 PM

First, what makes you think its blocked?

11-07-19, 05:37 PM

Well, bike runs fine from startup for 10 mins or so. Then the tickover ggets rough and the engine starts to surge. If you then open the petrol cap it suddenly runs fine. So i presume thars the breather valve. Happy to be corrected though!

glang · 11-07-19, 05:55 PM

Do you have an inrush of air or difficulty in opening the cap when its doing this?

glang · 11-07-19, 06:14 PM

From the manual it looks like theres an air vent hose that runs from the filler and comes out the underside of the tank so maybe this is kinked or blocked....

11-07-19, 06:49 PM

Ah, is there now? Good spot, I'll have a look at it. Thank you.

11-07-19, 07:26 PM

Yet again, members of this forum are so helpful.

Sent from my iPad using Tapatalk

11-07-19, 07:29 PM

I'll say, and fast too! Very much appreciated

mrplasid · 13-07-19, 08:48 PM

That's not a breather it's a drain for the filler hole

mrplasid · 13-07-19, 09:01 PM

Ithink there should be a hole small hole in the fuel cap to equalise pressure, perhaps thats blocked

11-07-19, 02:54 PM	#1
orangebud Guest Posts: n/a	Fuel tank breather blocked Hey all, the fuel tank breather in the petrol cap is blocked on my 07 sv650. Ive taken the petrol cap apart and cleaned everythong twice but no joy. Any ideas if im missing something stupid?

11-07-19, 05:34 PM	#2
glang Member Join Date: Oct 2007 Posts: 600	Re: Fuel tank breather blocked First, what makes you think its blocked?

11-07-19, 05:37 PM	#3
orangebud Guest Posts: n/a	Re: Fuel tank breather blocked Well, bike runs fine from startup for 10 mins or so. Then the tickover ggets rough and the engine starts to surge. If you then open the petrol cap it suddenly runs fine. So i presume thars the breather valve. Happy to be corrected though!

11-07-19, 05:55 PM	#4
glang Member Join Date: Oct 2007 Posts: 600	Re: Fuel tank breather blocked Do you have an inrush of air or difficulty in opening the cap when its doing this?

11-07-19, 06:14 PM	#5
glang Member Join Date: Oct 2007 Posts: 600	Re: Fuel tank breather blocked From the manual it looks like theres an air vent hose that runs from the filler and comes out the underside of the tank so maybe this is kinked or blocked....

11-07-19, 06:49 PM	#6
orangebud Guest Posts: n/a	Re: Fuel tank breather blocked Ah, is there now? Good spot, I'll have a look at it. Thank you.

11-07-19, 07:26 PM	#7
Othen Guest Posts: n/a	Re: Fuel tank breather blocked Yet again, members of this forum are so helpful. Sent from my iPad using Tapatalk

11-07-19, 07:29 PM	#8
orangebud Guest Posts: n/a	Re: Fuel tank breather blocked I'll say, and fast too! Very much appreciated

13-07-19, 08:48 PM	#9
mrplasid Junior Member Join Date: Oct 2016 Posts: 19	Re: Fuel tank breather blocked That's not a breather it's a drain for the filler hole

13-07-19, 09:01 PM	#10
mrplasid Junior Member Join Date: Oct 2016 Posts: 19	Re: Fuel tank breather blocked Ithink there should be a hole small hole in the fuel cap to equalise pressure, perhaps thats blocked

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