2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 299Get this manual
CRANKCASETRANSMISSIONCRANKSHAFTBALANCER- '05) Remove the lock washer, balancer weight, balancer B"nmE GEARrDR7vENGEARdrive and driven gearsB -" "
BALANCER WEIGHT LOCK WASHER Remove the sunk key from the balancer shaft