6. CYLINDER HEAD/VALVES STRYKER 125/150 Install the camshaft holder, washers and cylinder head nuts on the cylinder head. Tighten the four cylinder head nuts and two Nut Washer bolts. Torque: Cylinder head nut: 2.0kg-m · Apply engine oil to the threads of the cylinder head nuts. · Diagonally tighten the cylinder head nuts in 23 times. Camshaft Holder Adjust the valve clearance. Turn the cam chain tensioner screw counter-clockwise to release it. Cam Chain Tensioner Screw Apply engine oil to a new O-ring and install it. Tighten the cam chain tensioner cap screw. O-ring Be sure to install the O-ring into the groove properly. 6-17