A crankshaft end seal forms an air tight seal between the crankshaft and the crankcase. Because an air leak in your crankcase can cause damage to an engine, it is imperative that your crankshaft end seals are working properly and are not causing any leaks.
2001 Ultra 150
2002 1200 STX-R
2002 Ultra 150
2003 1200 STX-R
2003 Ultra 150
2004 1200 STX-R
2004 Ultra 150
2005 1200 STX-R
2005 Ultra 150