7. CYLINDER HEAD/VALVES MXU 300/250 Install the camshaft dowel pins and holder. Install the washers and nuts and tighten the nuts. · Apply engine oil to the threads of the cylinder head nuts. · Diagonally tighten the cylinder head nuts in 23 times. Torque: Cam shaft hold nut (Apply engine oil to threads): 2.5 kgf-m (25 Nm, 18 lbf-ft) 2. Turn the cam chain tensioner screw counter-clockwise to release it. Apply engine oil to a new O-ring and install it. Tighten the cam chain tensioner cap bolt. Be sure to install the O-ring into the groove properly. 3. Adjust the valve clearance. (Refer to the "VALVE CLEARANCE" section in the chapter 3) 7-9