Glad you got the brake drag issue fixed up ,even better it didn't cost anything hah! Yeah man the 17 toof sprocket is a "must have" ,they really respond well to that change ,along with a carb and pipe and you've got those done as well so you should be good to go ,from here on out it's just a question of deciding what you like to do with it most and setting it up for that ,and maybe some appearance pieces if you are into that .
Such a sweet find for $400 and it doesn't seem to have had any major issues at all ,just needed some tunin and tinkerin !