2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 189Get this manual
CRANKSHAFT AND OIL PUMP CRANKSHAFT REMOVAL 1.Remove: Crakshaft seal 1
NOTE: Mark note of the pasition of each crankshaft seal so that they can be installed in the correct place and in the correct direction2.Remove: Crankshaft Use crankcase separating tool 1Crankcase separating tool: PNYU-01135-A, 90890-01135