2005-2011 Honda FourTrax Foreman TRX500 FE/FPE/FM/FPM/TM Service Manual, Page 416Get this manual
IGNITION SYSTEM The ignition timing is correct if theF" mark on the flywheel aligns with the index mark on the rear crankcase cover at idleIncrease the engine speed and make sure the "F" mark begins to move
Coat new D-ring with engine oil and install it onto the timing hole capInstall the timing hole cap and tighten it