i am 245lbs. and 6ft. i ride a yz450 with a racetech suspention. the thing rides perfect on the trail but i will be doing alot of track riding soon. i want the best setting so i am not bottoming. a buddy said that i need to get some nitrogen pumped into the forks and shock. I don't know so i hope i catch an expert on the site today... the guy i bought the bike from was a desert guy and never really rode track. he is also about 20lbs. lighter. please assist.