guys i have a 09 kx250f with 75.3 hours on it from when i bought it brand new. everything is OEM and i havent touched the motor. i have checked the vlaves every 10 hours and they have not moved from factory specs, i know this casue i keep record of them when i check them. the carb is all stock too. i have only added a uni ait filter. im soon gwtting another job, maybe 2 for a short period of time till summer, then ill only ahve 1. but i am planning on sending my motor out somewhere to get modded. im looken for the low end power, simular to a 450 but not that much. im looking to get SS valves/springs. im thinking a big bore kit but not sure who does good work. i dont wanna go to big on the bore tho. maybe 30cc at the most. BTW i do harescrambles/woods riding.