My sxf 250 will cold start on first kick but usually when i ride it feels like a 35% of overall power(soo not much) throttle not opening and or bike doesnt feel powerful at all It feels like a dirty carb or like running out of gas for a sec. Sometimes it dies after 2-3hrs of use(not continuos hrs)and only starts when colder. Also,kick start feels pretty soft or low. I only checked the following: -carb cleaned -valve adjustment Thanks for your time !!!