classic motorcycle forum

When you say 'loosen off' with vibration, does your inner workings of the cap have the spring action to it,
such that when you snug down the wing nut/bar, it feels like it sort-of locks down, and then shouldn't move.

Also, my cap has more of a fibre type ring seal to it.
I've seen it said these should be boiled up before use, the moisture then makes them fuel-proof.

But maybe we haven't experienced panther type vibrations, so who knows !!?

Welcome aboard.
Cheers.

The top pic looks to be a Villiers, late 1950s ?, someone who knows them should be able to narrow it down.
The 3rd pic down is a Burman CP, probably AJS or Matchless or maybe Ariel, late 40s or early 50s likely, the numbers would narrow it down.
The other 2 I'll leave for someone more familiar with them.

All of them should have numbers/identifying marks...
Folks will always be looking for these as spares, although they are unlikely to make anyone a fortune....

That triangular area just under the fuel tank region is also quite short - unlike most vintage frames that had a long flat fuel tank aperture..
That marks it as late 20s very early 30s = early saddle tank design  ??
It looks familar, but I can't think what off...

Are there any threaded holes that you can determine if they are cycle thread or metric ?
Don't think its AJS, although there are features that look similar - as did many other makes.

200cc would have been an odd engine size then, 350 or 500cc would have been more common,
and are often tough to tell apart.

There are some odd features on that bike that don't really look BSA,
the forks, rocker gear, clutch and back sprocket look more like other brands. ?
The bike could of course be an amalgam, race bikes often used what was to hand...

What country is this likely to be, that often helps tracking down the rider - J Owens in this case

Tried your Yamahahaha dealer ?
Yamaha would likely have sourced the panniers from a known supplier,
if you can track them down....

A lot of those panner types you can get replacement locks and keys for, for not a vast outlay.
Example of givi replacements, to replace the earlier (simpler) key types.
https://i.ebayimg.com/images/g/rTEAAOSwgb1cMB8m/s-l1600.jpg

When you wave your mouse over the blank icon, it does say classic motorcycle forum index....

Good question though - maybe we could have a competition designing an icon ?

And if one exhaust is still sootier than the other, and there is no mechanical reason for this (oil burning, rings, valve guide etc),
then it might well be worth checking the float level in each carb.
And also the throttle synchronisation, if one cylinder is doing more than its share of the work...