1988-1994 Honda TRX300 Fourtrax, 1988, 1990-1994 TRX300FW Fourtrax Service Manual, Page 42Get this manual
MAINTENANCE
V ALVE CLEARANCE
NOTE Inspect and adjust the valve clearance while the engine is cold (below 35C95F)
Remove the fuel tank (page 4-3) Remove the intake and exhaust valve adjusting hole covers
Remove the timing hole capTRX300: Remove the crankshaft hole capTRX300FW: Remove the reduction shaft cap
TRX300: Rotate the crankshaft clockwise TRX300FW: Rotate the starter reduction shaft counterclockwiseAlign the "T" mark on the rotor with the index markThe piston must be at TDC on the compression stroke