2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 476Get this manual
IGNITION SYSTEM (After '05)
IGNITION COIL
REMOVALINSTALLATION
Remove the right front fender (page 3-6)Remove the spark plug cap from the spark plugDisconnect the primary wire connectorRemove the bolts, ground terminal and ignition coilInstallation is in the reverse order of removal
ICM (IGNITION CONTROL MODULE)
REMOVALINSTALLATION
Remove the top cover (page 3-5)Disconnect the ICM 4P, 8P and 6P black connectorsRemove the ICM from the holderInstallation is in the reverse order of removal