An absolute necessity for installing adjustable cams everything is solid built well and easy to use if you know what your doing, the only thing that could be better is the price
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ALL BIKES HAVE MARKS ON THE GEARS AND TWO OR THREE BOLTS HOLD THE GEAR ON TO THE CAM. SO THE CAM IS INDEXED BY THE BOLTS. THE ONLY ONE THAT I KNOW THAT DOESN'T IS YZF250 AND YZF450. THEY HAVE TO BE INDEXED AND THEN PRESSED ON. SO NO MARKS ON THE CAM JUST THE GEAR. IF YOU ARE BUYING FOR A YAMAHA BUY WITH NEW GEARS INSTALL BUY CAM MANUFACTURE. UNLESS YOU FULLY UNDERSTAND THE PRINCIPLES HOW TO DEGREE A CAM IN AND HAVE TOOLS TO DO IT.