THIS IS A NEW AFTERMARKET TIMING CAM CHAIN TENSIONER MANUAL ADJUSTER. NEW READY TO INSTALL. VERY SIMPLE DESIGN. EASY TO USE. COMES WITH GASKET MOUNTING INSTRUCTIONS. - THIS IS ON HAND, IN STOCK. WE CAN SHIP NOW!! WE SHIP VERY FAST! THIS FITS HONDA: - 1987 to 1990 CBR600F - HURRICANE 600 / CBR600 F1 - 1991 to 1994 CBR600F2 - HURRICANE 600 / CBR600 F2 WANT TO KNOW IF THIS WILL FIT YOUR BIKE? FEEL FREE TO ASK. REPLACE THAT OLD AUTOMATIC TENSIONER THAT WILL EVENTUALLY FAIL YOU. THESE 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. A MANUAL CAM CHAIN TENSIONER IS A MUST FOR ANY KIND OF PERFORMANCE RIDING. THESE MANUAL TENSIONERS ARE CNC MACHINED FROM BILLET ALLOY TO EXACT TOLERANCES FOR PERFECT FIT.