I currently own a yz426 (the red crowd boos!!!) and am looking to switch to a xr650r (the red crowd cheers!!). I rode a 2001 xr650r today that was completly stock. I liked the better ability of this bike to chug along with the kids but was very surprized at the lack of power for a 650. What honest gains are acheived by doing the power up modifications? Will it lose its ability to chug along without stalling. My 426 is also bone stock, its faster than I would ever need (though I enjoy that) but isnt much good for the slow stuff. Thanks for any/all help or advise!