2005 Polaris Sportsman 400/500 Service Manual, Page 81Get this manual
ENGINE to specificationsReplace spring if either measurement is out of specification indicatorA
5Remove valve sealsCAUTION: Replace seals whenever the cylinder head is disassembledHardened, cracked or worn valve seals will cause excessive oil consumption and carbon buildup
3Check end of valve stem for flaring, pitting, wear or damage (A)4Inspect split keeper groove for wear or flaring of the keeper seat area (B)NOTE: The valves cannot be re-faced or end groundThey must be replaced if worn, bent, or damaged