2000-2003 Honda TRX350 Rancher factory service manual, Page 57Get this manual
MAINTENANCE Rotate the crankshaft using the recoil starter knob to align the T'' mark on the flywheel with the index mark on the rear crankcase coverMake sure the piston is at TDC (Top Dead Center) on the compression strokeThis position can be obtained by confirming that there is slack in the rocker armIf there is no slack, rotate the crankshaft one full turn and match up the T'' mark again
INDEX MARK
W hen checking the clearance, slide the eeler gauge rom the inside out in the direction of the arrow
Check the clearance of all valves by inserting feeler gauge between the adjusting screw and valve stemVALVE CLEARANCE: INEX: 0.15 mm (0.006 in)