All the bikes that I have bought recently needed jet changes because of the very lean settings to meet EPA emission requirement including my 2005 Yamaha XT225, 2010 DF250RTB, 2009 Qlink XF200, 2008 Pitster Pro Classic 125. Usually just a simple increase of a size or two is needed. Not a big deal and I would not worry about nonsense statements such as
"I re-jetted the carb and put on a performance exhaust translates into I beat the snot out of it and now I want to unload it with its half life kicked out of it."