Koyo crankshaft special for crank applications. Koyo developed -9T cages which have a black appearance. These have a special coating that provides increased strength and aids lubrication under severe conditions normally found in 2 stroke motorcycles.
They also have special heat treated inner or outer rings to double bearing life by hardened resistance to wear from insufficient or contaminated lubrication.
Used to replace Yamaha 93306-30633-00
Product Code: KOY9111
