1993-2000 Honda TRX300EX Service Manual, Page 47Get this manual
Maint enance Turn the crankshaft counterclockwise, align the "T" mark on the flywheel with he index mark on the left crankcase coverMake sure the piston at TDC (Top Dead Center) of the compression stroke by moving the rocker armsIf the exhaust rocker arm is tight, turn the crankshaft counterclockwise one full urn (360) and make sure that the ''T'' mark on the left crankcase cover(1) "T" MARK
(2) INDEX MARK
Inspect the intaka and exhaust valve clearance by inserting the feeler gauge between the adjusting screw and valve st emV alve Clearance:
(1) FEELER GAUGE
INEX: O100.02 mm (O.004O.OOO8 in)