Velocity stacks / Air filters

[Bryanj]

There are two connectors on the carbs and two on the tap join them up

[El__burro]

So i have one line from fuel tank that feeds 1-2 and the other 3-4..?

Thanks
El__burro

[hairygit]

Yes!

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[El__burro]

So in both positions the fuel tap sends fuel to both carbs every time?
Thanks

[hairygit]

That's exactly how it should work, although many years ago I had a 750K2, and for some reason the tap blocked internally and starved cylinders 3 and 4 of fuel, took ages to work out what was happening, tried new points, condensor, plugs, coil, hotwired the coils in case of a break in the loom. An expensive and long winded way to find out it was the fuel tap!

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[El__burro]

Fine, the cup arrived, although I have a leak (i guess at the cup washer) my issue is another.
Oil level. (for which I started a new post)

Thanks
El__burro

[El__burro]

Going back to the leaking fuel tap.
I've notice that the cup gasket has a tiny cut in it; although it has not split yet it does not serve its purpose.
I have an over spillage of fuel once the cup is full
I need to buy a new washer/gasket.
Can I use one for plumbing purposes or it has some particular properties or shape?

Thanks
el__burro

[Chris400F]

Bet you wish you hadn't cancelled the order for the seal you accidentally ordered now!
I think the seal is just an O-ring but you need to make sure it is suitable for use with fuel, which 'standard' plumbing ones may not be.
I have a box of assorted O-rings which say they are suitable for use with fuel oils and petrol.
The inner thread diameter of the bowl of a spare tap I have is approx. 23mm, and I have found an O-ring that fits that.
The ones I have might be a bit thicker than the original but I think they should do the job.
If you PM me your address I'll send you one of these O-rings so you can try it.
If your thread diameter is different then let me know and I'll see if I have a suitable size

[Chris400F]

PM received. O-ring is in the post.

[El__burro]

Chris the o seal just arrived many thanks.
Unfortunately it's too small.
The inner diameter of the cup is approximately 26mm.
Shame i didn't measure it before you sent it.

I owe you one.
Thanks
El__burro

[Chris400F]

No problem, it was worth a shot.
I have larger ones but they are a larger cross section than the one I sent so I think would be too thick.
I think any O-ring of a suitable material would do the job - it needs to fit inside the threaded portion where the bowl screws in so slightly larger than 26mm outside diameter.
Pity you didn't go for the bowl I came across and gave you the link for that came complete with a new seal, but that's the benefit of hindsight!.

[El__burro]

problem solved (I hope for the long term)
I went down to my diy store (b&q) and I found a set of 6 plumbing O ring washer 3 different sizes two each @ £1.38
Fitted on the cup i am not sure if they are fuel resistant but since I fitted it I have no leak.

hopefully Ive managed to save at least a fiver.

Regards
el__burro

[hairygit]

Here's hoping they are ethanol resistant, if they do fail, it'll leak that saved fiver faster than you can blink! Let us know if it's still okay in a month or so, if it works it'll be handy to know about easily available locally,as it always seems to be late on a Saturday things go wrong, with no bike shops open!

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[Chris400F]

How is your B&Q O ring lasting? Does it still seem to be resistant to fuel?

[El__burro]

so far, so good.