1987 Honda Fourtrax TRX 250X Service Manual, Page 74Get this manual
CYLINDER HEADVALVES Install the cam chain over the cam sprocket with the punch mark on the cam sprocket facing upInstall the cam sprocket onto the shoulder of the camshaft
Position the cam lobes downReinstall the cam chain with the timing marks on the cam sprocket aligning with the cylinder head upper surface
Tighten the cam sprocket bolt to the specified torque