Please help 87?88?89? LT250r

[Sledhead]

I thought I had an 87 LT250R because of the VIN #'s, Then I recieved a diffrent 87 cylinder that is diff then the original one I have. The intake is larger and the bottem of the sleeve is diff. So now I don't know if this is the original motor. How can I tell what year the motor is. The motor numbers are J 109-105043. It is the power valve motor. Please help I want this back together asap. Would it be possible to have the 87 lower end and someone put the 88 up cylinder on???

[oldschoolzuk]

87 88 89 90 are the same and have the same style intake.91-92 have different frames but the same intake.so 87 has its own cylinder head 88-92 have the smaller 6 bolt style cylinder.

[quadster]

85-86 dont have power valve , reeds in cylinder and the swingarms and frames are different.87-92 bottomend motor are the same. 87 clyinder is different from 88-92(has bigger intake and 5 bolts instead of 6) All the heads have 6 stud holes, i think the 87 is cut different though. 85-87 axels have 24 splines 88-92 have 26.87-90 frames are same 91-92 have different swingarm linkage. Yes, you can put an 88-92 cylinder on 87-92 bottom end. You will need the different intake .
Scott

[Sledhead]

Yeah this cylinder definatly has a larger intake. I wish I new what year the lower end was just to be sure.

[Sledhead]

Can you tell the lower ends year by the case numbers?? If so does anyone know???