I'm 17 and i have a 1989 cr 125 and the bottom end blew up, so there for i need a new bottom end ive done countless hours of research and cant find anything ive searched forums all over and cant find help! But i would appriciate it if someone who Knows anything about putting a 2002 bottom end in a 1989 bike? That is my ultimate question!. and any advice would be great! Thank you!