Hi Chris,
Looks like your Centenary is in quite good condition.
Carburettor is a single lever type (that’s the name in the book of Villiers engines) and will be either 1” or 1 1/8” which were the lightweight and middleweight respectively. Parts for the mower bodies are scarce. Most engine parts are able to be sourced from the UK but frame parts are mainly a case of finding a donor or fabrication. Engine is a mk xic and looks to be from 4/47 based on the flywheel markings.
Manuals are uncommon for these machines. There is a book called The Villiers Engine by B.E Browning that is a pretty good source though.
With starting, the taper needle is set for rich, throttle opened up a little - usually about 1/4 way on the throttle lever which will make the slide sit so that it is open a fraction. Use the tickler liberally and then give it a spin over. Be careful with the crank handle as they can bite if the engine backfires.
Hope this helps.
Kind regards,
Sir Chook
