A few of my buddies are looking to get bikes. They really wanted 2 strokes until they went to the dealer and found out no one makes them (just like i told them) They dont know if they should get a 250f or 450f. Neither of them have experience on a big bike. And i have no experience on a 250f. Can they keep up with a 450 just doing trails and riding pits? How much weight difference is there between 250f and 450f??? Thanks!