I recently purchased a 2006 CRF70 bone stock with about 5 hrs total on the bike. I got it for a steal at 800.00. I was wondering if a few of you could help me out with the beginnings of many mods to come. I want to put a FMF exhaust and new air filter on it . I was wondring if that will require me to do anything to the carb or not. Will I need to rejet it or anything else that I might be overlooking. This bike is gonna start out as my nine year olds first bike til she learns, then it will be turned into my toy. Thanks for the help.