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 and seal designs are upgraded to the best and latest specs and designs. Contains right & left crankshaft bearings (contains outer seals for all 2-stroke engines). They feature Koyo & Nachi Bearings (precision Japanese crank bearings). All Balls seals are designed with a carbon/fluorocarbon sealing lip to reduce dry start friction & crank pin wear. Fits: Kawasaki KLF220 BAYOU 2WD 1988-2002 KLF250 BAYOU 2003-2011 KLF300A BAYOU 1986-1987 KLF300B BAYOU 1988-2005 KLR250 1984-2007 KLT200B 1983 KLT200C 1983-1984 KLT250C 1983-1985 KSF250 MOJAVE 1990-2004 KSF250 Mojave 1987-1989 Suzuki DR250 1982-1987 DR250S 1982-1989 DR400S 1979-1982 Yamaha TT350 1986-1998 TT350W (ADR) 2001 XT350 1985-1999 YFB250 TIMBERWOLF 2WD 1992-1994 YFB250FW TIMBERWOLF 4WD 1994 YFM250 BEAR TRACKER 2000-2004 YFM350 RAPTOR 2004-2007 2013 YFM350X WARRIOR 2WD 1990-1994