1986-1990 Yamaha YZ490 1992-1993 WR500 complete bottom end motor. this bottom end has bad crank bearings. this item is not plug and play, the cases will need to be split and have the crankshaft rebuilt. transmission and clutch work fantastic, but the crank went out on me, still spins, but not good. i think its bad crank bearings, but was running great previously. good stator, with good spark. good wire harness. cases are in good shape, no cracks or repairs, but does have a small amount of chain rub on the drive shaft left case, nothing to worry about, but please view all pictures. clutch cover has a small crack as shown in the picture, and has been JB weld repaired. i would recommend a new clutch cover, but this one does not leak any oil.