7. CYLINDER HEAD/VALVES ATV 300/250 Crankcase Breather Hose CYLINDER HEAD COVER REMOVAL Remove fuel tank. (Refer to the chapter 5) Disconnect the crankcase breather hose from the cylinder head cover. Remove the four bolts at the cylinder head cover, then remove the cylinder head cover. Cylinder Head Cover Bolts O-ring INSTALLATION Install a new cylinder head cover O-ring and install the cylinder head cover. Install and tighten the cylinder head cover bolts. Torque: 1 kgf-m ( 10 Nm, 7.2 lbf-ft) Be sure to install the O-ring into the groove properly. CAMSHAFT/CAMSHAFT Bolt 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. Tensioner Screw Turn the cam chain tensioner screw clockwise to tighten it. 7-4