my 02 cr250 has been boggin, down low very bad. when i get on the throttle it sputters and hesitates up until i get into the higher rpm range then it runs perfect. im running a NGK BR8EG gapped at 29 - 32, running 40:1 oil/ gas mix. what would be the best thing to do to try and get the bike to have more power down low, and be more responsive down low instead of hesitating. here is a vid of the bike to show what i mean about hesitation down low.