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