7. CYLINDER HEAD/VALVES (Mongoose/KXR 90) Mongoose/KXR 90/50 INSTALLATION Dowel Pins Reverse the "CAMSHAFT REMOVAL" procedures. Note the following points: 1. Turn the flywheel so that the "T" mark on the flywheel aligns with the index mark on the crankcase. Keep the round hole on the camshaft gear facing up and align the punch marks on the camshaft gear with the cylinder head surface (Position the intake and exhaust cam lobes down.) and install the camshaft onto the cylinder head. (Refer to the "VALVE CLEARANCE" section in the chapter 3) Install the camshaft dowel pins and holder. · Apply engine oil to the threads of the cylinder head nuts. · Diagonally tighten the cylinder head nuts in 23 times. · Position the camshaft holder "EX" mark on the exhaust valve side. Torque: Cam shaft hold nut: 1.82.2kgf-m Apply engine oil to threads 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) 7-8