6. CYLINDER HEAD/VALVES STRYKER 125/150 CAMSHAFT REMOVAL Cylinder Head Cover Remove the five cylinder head cover bolts. Remove the cylinder head cover. Inspect the cylinder head cover O-ring for wear or damage and replace if necessary. bolt Remove the cam chain tensioner cap screw O-ring and the O-ring. Turn the cam chain tensioner screw Tensioner Screw clockwise to tighten it. 6-4