Will, I have carried out the flashing / repolarization treatment as you suggested. Fired up and now I am a little confused on what I am seeing. Get the engine revs right and I am showing zero on the ammeter. Above or below that and the ammeter is oscillating between charge and discharge First of all...

Agree a huge surprise. Unfortunately I have a continuation log book so can't update on that. SW6 is 5 miles away from Balham so its a least in the right area, maybe a deal was struck at the time.

Thanks Paul,
I can support your comments as the photo shows the sellers nameplate it was sold by Taylor Matterson 81/83 Bedford Hill, Balam SW12 London.
Distance from Earls Court to Balham is 5 miles.

To clarify, in-situ means the bike is complete not already dismantled. So just trying to do what I can without removing the dynamo. Changes well I just fitted an DVR2 electronic regulator kit, should have run the bike up first with the original regulator fitted but didn't as it did work. Ive treble ...

Roger many thanks for the confirmation. My Square 4 engine is numbered PL105.

Ariel engine crankcase designation numbers were updated most years of manufacture, to quote a couple VH 1955 LC, 1956 MB and so on.

During a discussion I was advised that the engine serial numbers all started at 100.

Is this a myth or reality?

Hi My dynamo is in need of an overhaul as there's no charge. I would like to inspect clean / replace the brushes first of all, but I cannot see anyway of removing the chrome end cover without removing the primary chaincase to gain access. Am I missing something here? Drags charging notes suggest its...

Attached pics of the flywheel numbers which are far from clear. Educated guesses of what else it could be? VG5.jpg VG6.jpg VG7.jpg Also close ups of the bearing pins and their engagement in the flywheels which are between 4 / 5 mm 3/16 inch. VG8.jpg VG9.jpg Couple of pointers here. I have the 1 15/1...

Paul, Will post photos of both wheel designations in the morning.

John, they are steel not cast iron as confirmed when the O/ diameters were skimmed. Secondly their designation A7 / 343S will suggest the period 1933 / 1935 a period of supply of steel flywheels. That,s why I mentioned the relaxation of the taper fit. Sounds like youve done these before - what clear...