i know u can interchange a atc 250r fly wheeel with cr 250r flywheel but wut year does it have to be? and i'm putting a 87 crank in my 85 250r but the base bolts arent long enough with the spacer plate, wut years cr 250 bolts can i use?

 

I think what you need is a 250r long stud kit to go with the spacer plate

http://www.nacsracing.com/htmlcatalo...t-for-250r.htm