MS660 Tank breather leaking fuel

[Karlitos]

Hi all, One of my MS660s is an older model and has the older 'flapper' style tank breather valve. It appears to be intact but any time the saw is tilted with the pull start side facing down, quite a bit of fuel is leaking from the breather.... is this a common problem? Do the flapper valves stop working after a bit even if they are still in one piece?

 

I've attached a couple of pics fyi

 

[Wonky]

Looks like your missing somthing,  I’ve got a 026 like that, I just haven't worked out  which bit fits it. I thought it was one bit and when I got it it didn’t fit

let me looky at the ipl yours maybe more simple,, 

[Wonky]

You can see from my screen shot, from L&s what you need, yes that orange duckbill thing can leak and I would change it if you were ordering parts.. although there is a different newer type breather #3 and the grommet #2  in the pic, if it will fit yours I’ve no  idea 

and you can see a lot of things out of stock,,?

Edited April 29, 2020 by Wonky
Out of stock?

[Karlitos]

Thanks for that - I had wondered the same - thankfully I also have a newer model 660 so I was able to compare the two. Unfortunately it looks like they are not 'swappable' due to the older model having a different mount for the breather valve. (see pic attached)

 

Sometimes rubber components like that can look ok but not work properly - I need to place an order anyway, so I'll add on a couple of them and see if it fixes it. I'll let you know if that sorts it.?

[Karlitos]

And just to clarify - in my original pictures, I had removed the filter, connector and tank vent so that it was clear what items I was referring to. (items 4,5 and 6 in the parts diagram you loaded on)

 

Thanks

[AngrySquirrel]

Having similar issues on my 044 that has that orangey/red rubber duckie thing and ordered that but was wondering if that other part which don't list for 044 was an upgrade item 3 on yours but another number for mine but looks similar just don't have nozzle as mine vents upward

[Karlitos]

Yes, if the mounting is similar to the 660, then it seems that the new style vent won't fit - it has a different mount on the tank itself. I've ordered new flapper valve for mine so hopefully that sorts it?

[Karlitos]

Hey Guys, just a small update - eventually the new flapper valve arrived and I swapped it for the old one. This has fixed the problem and it doesn't leak at all now.

 

It seems that even if the valve looks visually ok, it can deteriorate to the extent that it doesn't function properly any more.

[Stubby]

11 minutes ago, Karlitos said:

Hey Guys, just a small update - eventually the new flapper valve arrived and I swapped it for the old one. This has fixed the problem and it doesn't leak at all now.

 

It seems that even if the valve looks visually ok, it can deteriorate to the extent that it doesn't function properly any more.

Boom ! ?