7. CYLINDER HEAD/VALVES (Mongoose/KXR 90) Mongoose/KXR 90/50 Bolts CYLINDER HEAD COVER REMOVAL Remove fuel tank. (Refer to the chapter 5) Disconnect the oil recycle tube at the cylinder head cover. Remove the four bolts at the cylinder head cover, then remove the cylinder head cover. Cylinder Head Cover INSTALLATION Install a new cylinder head cover O-ring and install the cylinder head cover. Install and tighten the cylinder head cover bolts. Torque: 0.81.2kgf-m Be sure to install the O-ring into the groove properly. O-ring Bolt CAMSHAFT/CAMSHAFT HOLDER REMOVAL Remove the cylinder head cover. (Refer to the "CYLINDER HEAD COVER REMOVAL") Remove the cam chain tensioner cap, bolt and the O-ring. Turn the cam chain tensioner screw Tensioner Cap Tensioner Screw clockwise to tighten it. Turn the cooling fan clockwise so that the "T" mark on the flywheel aligns with the index mark on the crankcase to bring the round hole on the camshaft gear facing up to the top dead center on the compression stroke. Round Hole Punch Marks 7-4