Pre unit c series identification

PRE- UNIT C MODELS	249cc 63mm x 80mm C10 SV, C11,C12 OHV

1945	C10, C11 introduced 3 speed, rigid frame, girder forks 19" wheels for C10, 20" for C11, 51/2 front brake, 21/2 gallon tank, dynamo lighting.

April 1946	Telescopic forks speedometer in tank.

1948	C11 De Luxe special finish, C11 drip feed under carburettor added.

1949	Larger dynamo, no drip shield, light alloy cylinder head on C10.

1951	Neater handlebar layout with horn button on front brake mounting, C11+ C11 De Luxe new cylinder barrel, all models plunger frame and 4 speed box optional extras.

September 1951	C11 De Luxe discontinued.

1952	C10 - C11 improved 51/2" brakes, 19" x 3.00 tyres on both, C11 finish as De Luxe.

1953	Boxed in rear number plate, new improved tail light with reflector, speedometer on front forks, under-slung pilot light, dual seat option.

November 1953	BC10.2588 Engine BC10. 2584 Frame, BC10S.4524 Frame, BC10S.4.7328 Frame C10 discontinued.
	BC11.11723 Engine BC10. 2584 Frame, BC10S.4524 Frame, BC10S.4.7328 Frame C11 discontinued.

1954	C10L introduced engine similar to before but fitted with AC generator and built in contact breaker, new welded plunger frame, Bantam D3 type front forks with cowl. C11G introduced engine similar to C11 but fitted with AC generator and built in contact breaker, cowled front forks, 3 speed rigid. Plunger and 4 speed box optional extras.

September 1954	C10L monobloc carburettor, pancake type rectifier. C11G rigid discontinued, monobloc carburettor, pilot light into headlamp, 7" front brake, steering head lock.

November 1955	BC11G.24000 Engine BC11S.19036 Frame C11G discontinued.
	C10L, 4 speeds, 51/2" front brake, steering head lock, hydraulic damping in front forks, modified cylinder head with fins, twin switches for lights and ignition.
	C12 introduced, C11G engine in swinging arm frame, 4 speed box, full width brakes 7" front, 51/2" rear, 21/2 gallon tank, switch panel on right side of machine.

October 1957	BC10L.10935 Engine DC10S.39071 Frame C10L discontinued.

August 1958	EC12.23032 frame C12 discontinued.