Hey, I ride an 07 yz450f. Everything in the carb is stock except for a 48 pilot jet. FMF Speed Ti Slip on. What would I have to change to ride in the winter? I'm thinking of doing some ice racing, I went out and watched and it looks wicked fast, 5th gear wide open straights. I would set it up for about -15C. Altitude 1600ft. I want to order the new jets so I will have them for winter, I know it's sad, the nights are already cooling off. Also, does anyone have a line on studded tires? Thanks.