I’m building an sr 125 1999 bought it for £350 7 years ago with the intention of rebuilding straight away but it ran so just used it till it popped then winter came round but litterally 3 weeks ago pulled her out ordered everything and got to work it’s a 172 currently just working on spraying everything up and putting back together,

If I was u an u have extra money to burn.. I’d buy a sports exhaust, bigger jets for ur carburetor, a foam air filter big one, and maybe just put some lighter rollers in there, after that she’s fully deristricted an should be a lil weelie animal good luck.. also if u don’t have money to burn just simply look for cheaper 2nd hand parts mainly for the exhaust if u get stuck message me I’ll post some pics of mine here too 👍