I didn't know that.
And I like that.. It brings back good and bad memories.
The first moped I ever rode was a Solex (probably '69').. I had a mini-bike with a lawn-mower engine in it, and my grandfather said he had a Solex that didn't work and I told him I might be able to fix it (at 12 years old).. I think he thought that was funny.
I took apart the 'carburetor' (about the size of a dog whistle) and it was gummed almost solid with stuff the consistency of thick vaseline.. cleaned it out.. ran great.. rode it to a friends house to show him..I was surprised it went 30 mph..
rode back for a 10 mile round trip..and called my Grandfather and told him I fixed it and he could pick it up..DOH!.. he came over and I think he was embarassed that a 12 year old fixed something that he didn't figure out.. and he loaded it up and took it.. I don't think he even wanted it.. and I probably could have kept it if I had asked to.
I would say it performed as good as my now modified Honda PA50 30 years later.
With probably a better chassis tires and suspension.