i have had a kehin carb on all my gasgas's what i have had since 04 and every single bike i have had with a kehin on it has improved all my bikes no end its improves it on the bottom end middrange and top end and my 07 gasser at the moment is absoletly awesome with it on, trust me i know!!!
i dont know how my dad does it but if he told me he would have 2 shoot me!!