it is fairly easy they split top to bottom and then u can pick ur crank right up go to www.babbittsonline.com and serch banshee case or crank and a thing should come up showing how everything goes together/apart but u also kno that u should replace your crank seals and i would use the yamaseal or whatever its called .... inbetween the cases when u put them together the crank case has to be air tight