All Balls Racing Crankshaft Bearing Kit (24-1061)Contains right and left crankshaft bearings (contains outer seals for all 2 stroke engines). Either Koyo or Nachi Bearings (precision Japanese crank bearings)Reduce crank pin wear with our crank seals! Our seals are designed with a carbon fluorocarbon sealing lip to reduce "dry start" friction Quality design and construction of every All Balls piece meets the toughest standards and conditions from daily commuting to full on racing, all older bearing