That's a very early engine number but the gearbox date seems a little late in comparison. The oi tank looks right and the TT would have had a huge, knee-cracking pancake filter. The front mudguard stay is right for an early HS too. As Simon says the real incongruity is the frame with a front sidecar...

As I remember the discussion that followed the 'unveiling' of the orange KHA there was considerable scepticism over the claimed provenance of the bike. The bike in the Cheval article is an interesting collection of parts. With the knobbly tyres and lights I wonder if it was a privateer's ISDT-type m...

I'd assumed for some reason you were fitting new, club rods.

It will be well worthwhile fitting new rods if there is any doubt about the ones
currently fitted. If one lets go it will wreck the engine.

Whilst still in preaching mode, the oil ways ought to be 'clinically clean' too.

You should find all the information you need and more here:

http://www.arielownersmcc.com/members_o ... ooklet.pdf
http://www.arielownersmcc.com/members_o ... 0sheet.pdf

The one shown in Pete's picture - the 'real thing' - can jam in the cable attachment at the butterfly end and allow the butterfly to remain partly open, another good reason for relocating the ignition switch in the headlamp where it is less difficult to reach. I've threaded a small washer over the n...

The bracket is 1024A-37 and the spring 6492A-37.

I've had the butterfly in the Solex freeze in the part-open position. I survived and moved the
ignition switch from its inaccessible position under the seat and set it up in the headlamp
where it remains to this day.

Yes, I always use them and for no better reason than that's what Ariel did.

Valve spring cup washer, Halite, 580-34 and seemingly available from
Draganfly and possibly others too such as the spares scheme.

For what it's worth 375 monoblocs without the threaded inlet were fitted to Arrows and Leaders
with the 376 fitted to Sports Arrows.

Thanks for the information and pictures. The front brake assembly from the Square 4 is clever design and well engineered. Do you know how the wheel spindle is arranged for the BSA brake? We had an attempt at that but the wheel spindle finished with a horrible step at one side which looked like a dis...