how can i fix my Peugeot speedfight 2 ?

I took off the variator cover off and had a look for the restrictor which It didn't have one so I put the cover back on and when I started it it made a grinding noise so I took it off and finally got it into a certain way where it starts proberly and the kick start works but it takes off very slowly and sounds like its going to bog out... Have I done any thing wrong ?