If your clutch pads are partly bare metal, they are used up.
Your pulley might be extremely small, therefore you get a higher top speed but a lower acceleration. What size is it. Do please measure; inches or cm's is fine.
Also, your piston rings might be fried/used up...
How fast can you start the Ciao? Does it take only one meter (3 feet+-) or do you need to run a whole football field before it starts?
Jets are right? Check the sparkplug for the correct jet settings, if you know how and what method that is.
Post a pic, hehe, I love pics...