kx 125 free mods?

hey everybody i personally own a wr 250f and am starting to learn about the free easy mods that can be done. And i was wondering if there were any simple mods that i could do for my brothers bike. Yea i know it fast enough stock lol but i want to go faster because i ride it some also lol. It is a real fun bike. I like mine and his equal though different plus for both you know. Wll thanks people if i can get any hints. O yea his year is a '03 kx 125 in almost perfect condition barely anything wrong with it.

not much you can do with those, If it has a snorkel on the airbox remove that otherwise ?????

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