i have a manual that came with the bike. the only mod i can tell that has been done is the uncorked muffler one. the air box lid was on it so i took that off. i was thinking it may not have the throttle stop mod done because it doesnt pull a wheelie in third gear like my old yz did. stll will in 1st and 2nd. its seems like it is as fast or almost as fast as the yz thoug. should it be faster since it has the wide ratio trans?