2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 220Get this manual
WATER PUMP
WATER PUMP DISASSEMBLY 1.Remove: Rubber damper holder Rubber damper (from the impeller, with thin, flathead screwdriver) NOTE: Do not scratch the impeller shaft2.Remove: Water pump seal NOTE: Tap out the water pump seal from the inside of the water pump housing2 Water pump housing