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Messages - Ratty

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British Bikes / Re: Hello, and what is the score with leaking 'wing nut' fuel tank caps?
« on: February 27, 2019, 10:52:31 PM »
Quote from: john.k on February 26, 2019, 11:01:20 AM
My M100 from 1946 does have a shallow groove formed into the neck,right where it joins a flanged hole into the tank shell..........and it does grip tightly and pull down as the wingnut is turned,

Thanks John. Hmmm, wonder if a little gentle metalwork would give the wedges some purchase...

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British Bikes / Re: Hello, and what is the score with leaking 'wing nut' fuel tank caps?
« on: February 25, 2019, 08:01:14 PM »
Thanks  all for your replies, and apologies for the delay in replying.

Yes, it's the type that has the 3 'wedges' that expand into the neck of the tank (it's a new reproduction tank by the way, so shouldn't be worn, but may be oversized I guess). It seems like the vibration from the motor allows the wedges to slip, and the cap works it's way up from the flat fit it has when locked down, obviously angling towards the rear hinge.

As an aside, the tank filler neck is completely smooth from top to bottom. I wondered if on an original tank there would have been a groove for the wedges to sit in, or a ring for them to sit below? The seal I have is definitely of a slim rubber type, so I may try cork or fibre, to see if this will fill the gap.

Thanks again guys...

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British Bikes / Hello, and what is the score with leaking 'wing nut' fuel tank caps?
« on: February 13, 2019, 08:28:56 PM »
Hi all, and thanks for letting me join your most excellent looking forum! I fully intend to get involved and offer as much to the forum as I may take from it, so huge apologies for being on the latter end of this from the start, but;

How do you get a good seal on a 'wing-nut' type fuel filler cap? I have a breathed on M100 Panther, and I love it to bits, but the filler cap leaks like a !"£%^% with anything more than half a tank. Partly I can put this downtown vibration, but they can't have been this bad when new, so what have you all done to get a sealable filler?

I've made sure the hinge is angled right, so the cap fits flat to the filler neck, but it still loosens with vibration. Do I need a better rubber gasket? Or is this just an incurable problem that will only be resolved with a different tank cap?

All input gratefully received 😉

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