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Probably 30 plus years ago I restored a ‘74 450 Desmo
I’m almost sure I cut new 3 hole tap seals from sheet of fuel proof material ? (Not viton, the other stuff that I can’t recall the name of)
Anyway both taps leaked, flooded the carb, and drained into the sump. Obviously the float needle and seat needs replacing also.
I see there are various sizes of these round seals.
I measure the old ones at just under 14mm.
13mm ones are available in Viton.
Wondering if the old 14mm ones have stretched? and should be 13mm

Graeme

G'day Graeme,

Not sure of your specific taps, any images, please?

The Oldani's fitted to my '74 450 MKIII, with the square body, the seals were crisp. Replaced using Viton sheet, can't remember the thickness, with the seals cut using a wad punch and the 3 small holes cut using multi eyelet punch pliers, used by leather workers.

I can go and dig out details, but will need a wee bit of time.

Our early summer, just outside Perth, Scotland, is a bit cool, with fresh snow on the hills down to 1,500 feet and a cool northerly breeze! You'll be on the run in to autumn now.

Good health, BillR

I did the same for the "sugar cube" taps on my Guzzi last year. It took a couple of attempts to get the holes in the right places but all good now.
Borrowed the punches from a friend, with the Viton sheet from his stock too.

Thank you gentlemen,
Yes they are the small square chrome plated taps used on lots of ‘70’s Italian bikes.
My question is, what is the diameter of the viton
My old ones are 13.8mm (may have been squashed over the years.)
Closest I can find is 13mm OD, or much larger like 17mm
Possibly best to wait until I get the 13mm ones and see how they fit.
Here is a pic from the internet as mine are dismantled

https://www.ebay.co.uk/itm/254514338429

Is this any good to you? I've just bought some of these for my TS175 project. They seem to fit fine, but I haven't tried them out with liquid in the tank yet.

I bought these…… work perfectly… and you get a spare!