1983-1985 Original Honda ATC 200X Shop Manual, Page 55Get this manual
CYLINDER HEADVALVES CAM SPROCKET
Remove the crankshaft hole cap and timing hole cap from the left crankcase coverTurn the crankshaft to bring the piston to T.O.Cof the compression strokeRemove the cam sprocket bolts, and remove the sprocket
CAM SPROCKET BOLTS CAM CHAIN
Remove the camshaftNOTE: Suspend the cam chain with piece of wire to prevent it from falling into the crankcase