I know not all will be interested in my 50cc plastic cart but for those who are:-  (how many of you are there?)
I bought a Super Comtesse from the French Alps recently.  I already have one.  When this one arrived I was surprised to find it in very good condition with 875km on the clock.
I had a tinker and soon found out why it had been abandoned.  The decompression cable was tight giving no real compression.
There were quite a few odds and ends of spares with it.  The type of things you might want to change if you were trying to identify a problem.  Spare carb, new coils, spare barrel and piston, and other bits and pieces including a new 17 tooth sprocket.
I got it running and it sounded really sweet.  Driving it about the garden, it went well but not very fast at all (speedo wasn't working so 875km?).
I was puzzled by the new 17 tooth sprocket.
Looking underneath the final sprocket on my car was 24 teeth.  I looked at my other Comtesse and it had 17 - quite a difference from 24.  
A quick swap and I was getting nearly 30km/hr (speedo fixed - French glue type grease in the speedo, cable and gear).
For all lucky Comtesse owners, check the final drive sprocket.  I can only assume that the 24 tooth was an option for carrying very heavy passengers or quick trips to the summit of Mont Blanc!
I have one leaking rear brake cylinder - any one know what car these came from - 2CV?