1999-2004 Honda TRX400EX FourTrax Service Manual, Page 89Get this manual
CYLINDER HEADVALVE Remove the upper engine hanger nut, bolt and spacersNUT-
Remove the timing hole cap, crankshaft hole cap and valve adjusting hole caps (page 3-71,
The crankshaff should be turned only counterclockwiseThis must be done to prevent the onewaydecornpressorsystern functioning
Rotate the crankshaft counterclockwise and align the "T" mark on the flywheel with the index notch in the left crankcase coverMake sure that the piston is TDC (Top Dead Center) on the compression strokeThe rocker arms should be looseIf the rocker arms are tight, rotate the crankshaft counterclockwise one full turn and realign the "T" mark with the index notch.1