1999-2002 TRX400EX Fourtrax Service Manual, Page 94Get this manual
CYLINDER HEADVALVE
CYLINDER HEAD REMOVALI DISASSEMBLY
Remove the following:exhaustsystem (page26)carburetor(page5-3)cylinder head cover and camshaft (page 7-3)sparkplug Removethe four cap nuts and washers, being careful notto drop them into the crankcaseDo not strike the Remove the cylinder headcylinder head too hardRemove the gasket and dowel pins
Remove the three bolts and the carburetor insulator from the cylinder headRemove the O-ring from the carburetor insulator