I run an 04 450 but it aint stock
-15/24ish in high gear. I have 13,14,15 fronts and 24-28 rears. The track we run on is a touch bigger than 1/4mile @1430'
-I use the Mikuni round pulse pump with two outlets. One to the carb and the other back to the tank with a restrictor pill in it. I used 1/4" aluminum round bar and drilled a 1/8" hole in it. The pulse I get from the intake runner in the head.
-The Wendle Pogie cover mod is the best way I have seen to use a kart starter on a 450, but that is Honda only.
-I don't think people flip their nerfs, I think they just flip the side panel up on the nerf or remove it.
Good Luck and have fun!