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! Mounting O-RING IS INCLUDED. THIS FITS KAWASAKI: - 2003 to 2004 ZX636 - B1,B2 - (NINJA ZX-6R) - 2005 ZX636 - C1 - (NINJA ZX-6R) - 2006 ZX636 - C6F, D6F - (NINJA ZX-6R) - 2013 ZX636 - EDF, FDF - (NINJA ZX-6R ABS) 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 MOMENTARILY 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.