THIS IS A NEW AFTERMARKET TIMING CAM CHAIN TENSIONER MANUAL ADJUSTER. NEW READY TO INSTALL. VERY SIMPLE DESIGN. EASY TO USE. - THIS IS ON HAND, IN STOCK. WE CAN SHIP NOW!! WE SHIP VERY FAST! -AN O-RING IS INCLUDED. THIS FITS KAWASAKI: - 2004 to 2023 KX250F / KX250X This one is Black. We do have red, blue, green, Silver also. Just let us know if you want another color. REPLACE THAT OLD AUTOMATIC TENSIONER THAT WILL EVENTUALLY FAIL YOU. THIS MANUAL CAM CHAIN TENSIONERS ARE DESIGNED TO REPLACE THE AUTOMATIC AND HYDRAULIC TENSIONERS ON HIGH PERFORMANCE ENGINES. THE AUTOMATIC ADJUSTERS CAN BACK OUT WHEN THE THROTTLE IS CLOSED SUDDENLY AT HIGH RPM. THIS ALLOWS THE CAMS TO GO MOMENTARELY OUT OF TIME, AND CAN RESULT IN BENT VALVES AND SERIOUS ENGINE DAMAGE. HYDRAULIC TENSIONERS HAVE A TENDENCY TO PUT TOO MUCH TENSION ON THE CHAIN GUIDE UNDER HIGH RPM (HIGH OIL PRESSURE CONDITIONS), RESULTING IN PREMATURE WEAR. BOTH PROBLEMS CAN BE ELIMINATED WITH THE INSTALLATION OF THIS MANUAL TENSIONER. NO MATER WHAT THE ENGINE DOES, THE CAM CHAIN TENSION WILL REMAIN CONSTANT. ATHISMANUAL CAM CHAIN TENSIONER IS A MUST FOR ANY KIND OF PERFORMANCE RIDING. THIS MANUAL TENSIONERS ARE CNC MACHINED FROM BILLET ALLOY TO EXACT TOLERANCES FOR PERFECT FIT.