Either 3BA or 4BA, can't remember which. Sorry that's tank badge retaining screws. Didn't read the post properly.

If you have Facebook, there is also a group called "Ariel Motorcycle group", where you will find a lot of members also in it. There's a lot of information in the "Files" section on the left hand side of the page.

Just an observation. Shouldn't your tank mounting rubbers be the other way around? i.e.thicker one to the top to support the tank on the frame lug?

I'll second that one. I sent off my speedo from my square 4 (which wasn't working), and he emailed me back to say it wasn't actually the right speedo for the bike. He re-calibrated it for the bike, and reconditioned it, and I had it back as new a week later. Excellent job.

Hi Stewart - if you're not against sane upgrades; - strongly suggest an Iron Horse alternator - 12v 300W - then you can see, be seen & fit heated grips, an en suite closet & whatever takes your fancy... recommend you do NOT use cheaper alternatives to the Iron Horse device... Have Kirby Row...

Viton rubber sheet is available. Cut a new ring of this using the original cork one as a template. Viton rubber is resistant to ethanol, whereas cork will eventually disintegrate in contact with ethanol in fuel. Google it.

Don't know if this is any use to you, but have a look at it anyway..

I wouldn't fit a full fairing to a Square 4. They tend to run hot as it is, and the reduction in air flow over the engine would possibly be detrimental.

Looks like the oil delivery pipe from the bottom of a Square 4 oil tank.

https://www.tankcareproducts.co.uk/ I used their products on my Sq4 tank, which had previously been sealed with a product called Petseal, which wasn't compatible with the ethanol in modern fuels. They do a Petseal remover, and various de-rusters and chemical cleaners and de-waterers for use prior to...