i have a 2002 cr250 and i am going to the cinders this weekend.... Stock main jet is 380. i currently run a 390. How many sizes do you think i will need to go down for the cinders. will i HAVE to change the pilot jet too.? ive heard you can get away with just the main.. I will only be ridding there one day and want to be as dialed as i can befor i get there so i CAN RIDE!! thanks alot!!! help!