2008-2010 Kawasaki KFX450R Factory Service Manual, Page 265Get this manual
CRANKSHAFTTRANSMISSION 9-17 Crankcase
output shaft with new one Replace the O-ring [A] on theshaft while expanding the O-ring on the Installby the handoutput -ring engine oil to the O-ring Apply engine oil to the outside surface of the collar [B]Apply Insert the collar with the oil groove end [C] facing inside