Hello again. I did have a manual for the CS50 scooter somewhere, when I find it you can have it. As I remember the cs engines are the ones to avoid, the reason being that they have a very complex and power draining mechanical auto gearbox, the scooter was an allmighty flop and then the belt drive variomatic scooters took over. The CP50 is I think of the latter. In our old Bamby we ditched the CS50 for a CP80, this was the belt type and was a terrific little engine and whats more it just bolted trait in, all the mounting holes were the same as the CS engines. The cars performance doubled in power, if you could find one it would be a good unit to use in a cursor.