1986-1987 Honda TRX350 FourTrax 4X4, 1987-1989 TRX350D Foreman 4X4 Service Manual, Page 82Get this manual
CYLINDER HEADVALVES Realign the "T" mark with index mark and recheck the cam sprocket timing marks
Fill the oil pocket in the cylinder head with fresh oil
Remove the cam chain tensioner seating bott and washer from the tensionerTurn the tensioner shaft clockwise with small screwdriver to retract the tensioner, and hold it in the fully retracted position