Need advice on changing the carburation and looking for crank case cover (R)
 

Hey so I'm new here and this is also my first bike so I don't know much about working on them yet. Apparently it is common for people to throw aftermarket pipes on these bikes without tuning the carburetor so I need some advice on that. It has 2 brothers slip ons on it and as far as I know everything else is stock. The previous owner dropped the bike and did a shitty job fixing the crank case cover so if anybody knows where I can get a decent used one that would be great