There are a number of issues fitting a concentric to a Mk 1. The stud centres are 1 7/8" not 2" and there is precious little room either. Ariel did fit an Amal to some US export models - a model 275/154R which was laid on its side. The more-or-less continuous suction from a 4 causes proble...

I'm with Guy. My Mk 1 was transformed from a pleasant old friend into a twitching neurotic simply by swapping the Solex for a Concentric when the petrol union threads stripped on the Solex. The slide hangs up from time to time too so make sure you can reach the ignition switch. If I'd been on the ba...

I too have 'mixed and matched' over the years and not noticed any difference, in either vibration or acceleration. The flywheels were changed in 1954 but whether it was to suit the different mechanical properties of the new PRF frame I know not. The death of flywheels comes when the mainshafts or cr...

I like the idea of a scrambler with pillion footrests. I might have done better with
a pillion to tell me what I was doing wrong . . .

W/NG perhaps?

Red Hunter was the sporty model OH, NG & VH. The De-Luxe OG, NG & VG models had 'proper' mudguards &c. I'm not sure when Red Hunter was first used but it was well before WW2. When the De-Luxe models disappeared from the market the Red Hunter name seems to have been kept on, except, brief...

Apart from the irritation of the return ball valve holding off its seat and subsequently having to drain the magneto in over 50 years I've never felt the need to replace a pump. The engines don't seem to need a lot of oil, except in the timing case for the cam and they don't wet-sump either. My BSA ...

An interesting browse of the Knowledge Base. The 1954 sales brochure uses the term 'Hunter' not 'Red Hunter' but in the 1955 brochure the models have become 'Red Hunter' once again. Neither of them mention bench testing but both the 1954 and 1955 Competitions brochures mention a certificate of perfo...

By 1954 which is when Johnny's was manufactured there had only been the NH for a few years the NG having disappeared in 1950 and in 1954 the NH got the new cast iron wheel to suit the new PRF frame. I had a 1954 350 for a number of years and it was a very nice machine to ride too. I think the 1954/5...

Johnny,

https://www.draganfly.co.uk/data/pdf/not_all_ariel.pdf is not a bad place to start.

I've just had another look at the ebay photos. The field stand lug is hidden behind the electric
horn to which it is probably fixed.