Hi Gizmo The first 3 pictures the mower is a KX-D Picture 4 and 6 are a KX-C this one was only made for 1 year Picture 5 is a KX-A All the above mowers have a EC-B engine and from the engine number I can date the mower The EC-B engine 2hp at 3000rpm. 9 cu ins (150cc) Bore x Stroke 2 1/2" x 1 7/8" Thanks for the pictures Ian