Then this is the adapter you need

Protection for the lower body

Two -layer foam design - stops both large and small particles effectively

this helps prevent the pedal shaft from being bent around in a collision

Double layers of leather on shoulders

PRO CIRCUIT Works Expansion Chamber Steel Kawasaki KX250 PK04250 kawasaki-kx-80-std-wheels-17-14--kx80f--80-1985-esi1959818 Then this is the adapterThe Original Pro Circuit Works Pipe Offers Unparalled Performance and Power for Every Two Stroke Application. INCREASED HORSEPOWER AND TORQUE GAINS Will Quickly Be Noticed Across The Entire RPM Range. The Unplated, Oiled Metal Finish Requires Some Maintenance, But Really Gives Your Bike That "Works Look". Features Include: Stamped AKDQ High Quality Carbon Steel Construction Hand Welded and Pounded Seamsreinforced Mounting Brackets and Stinger Note: