2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 443Get this manual
ELECTRICAL ('04'05) Read the Connect timing light to the spark plug wiremanufacturer's instructions for timing light IDLE SPEED: 1,600 100 rpm operation
The ignition timing is correct if the "F" mark on the flywheel aligns with the index mark on the left crankcase cover
INDEX MARK