I'm looking to get my seven year old son a TTR50 for Christmas. He won't be racing it but he will be riding it pretty hard. He races mx and will be using it for pit riding (where allowed) and some aggressive yard riding. I will ride it too but probably not on a track. What mods do you guys recommend right from the start? Bars, HF Air Filter, Pegs, HD Springs, tires, etc. I'm not interested in a big bore kit yet. They are just too expensive right now.