This used secondary carburetor throttle valve / slide fits:

1983-1984 XR500R

1983-1987 Honda XL600R

1985-1987 XR600R

This used carburetor slide is in good condition

Please see photos to view item condition 

If you rebuild or restore any type of machine you know how important it is to use genuine / original factory parts when possible. A repair or restoration is intended to return that project to as close to original as possible, right down to the secondary carburetor throttle valve / slide.

If there's even a chance you'll need this/these replacement part(s) in the future you'd better get them NOW!. Keep this in mind,  replacement parts are always good to have. When you decide to sell your Honda, including a few extra replacement parts always sweetens the deal for both buyer and seller.