Ensure smooth bottom-end rotation and reliable crankcase sealing with the ProX Crankshaft Bearing & Seal Kit (Part No. 23.CBS63001). Manufactured to strict OEM specifications using high-grade components from trusted industry suppliers, this comprehensive kit includes everything needed to refresh your main bearings and oil seals during a top or bottom-end overhaul.
Designed to handle high operating temperatures and extreme RPMs, the premium bearings minimize friction and radial play, while the matched rubber oil seals prevent primary compression leaks and keep gear oil out of your crank chambers under aggressive riding conditions.
Vehicle Fitment
| Make | Model | Year Range | Specific Years |
| KTM | 250 SX / 250 EXC / 300 EXC | 1997–2003 | 1997, 1998, 1999, 2000, 2001, 2002, 2003 |
Kit Contents:
- High-Precision Crankshaft Main Bearings
- Match-Spec Crankshaft Oil Seals
TSO Tip
When splitting the cases to replace main bearings, thoroughly clean and heat the crankcase halves evenly to a moderate temperature (around 100°C) to allow smooth drop-in installation without side-loading or damaging the bearing bores. Always apply fresh two-stroke oil or assembly lube to the bearing rollers and seal lips prior to buttoning up the engine.
