Boss Bearing KTM-MC-1001-4H5-B-6 Main Crank Shaft Bearings and Seals Kit KTM 250 SX 1998-2002 Kit Includes: 2 Bearings and 2 Seals Bearings are prelubed and packaged with waterproof grease Our crank seals feature a sealing lip which is designed to reduce crank pin wear