get a 19 kx450 , apparently a big change , even if you add electric start weight of 5 lbs it will still be lighter then porky yam. i get to ride just about every mx bike that comes out , i noticed that the yz 450 and 250f of late with the air box up front feel wide and have the annoying air box noise straight at your face , in my own personal shootout , i put them in last place .