7. CYLINDER HEAD/VALVES ATV 300/250 Camshaft Holder CAMSHAFT HOLDER INSPECTION Inspect the camshaft holder for wear or damage. Inspect the rocker arm shaft for blue discoloration or grooves. If any defects are found, replace the rocker arm shaft with a new one, then inspect lubrication system. Rocker Arm Shafts Rocker Arm Bore Inspect the rocker arm bore, cam lobe contact surface and adjuster surface for wear/pitting/scratches/blue discoloration. If any defects are found, replace the rocker arm shaft with a new one, then inspect lubrication system. Contact Surface Adjuster Surface Measure each rocker arm shaft O.D. Measure the I.D. of each valve rocker arm. Measure arm to shaft clearance. Replace as a set if out of specification. Service limits: 0.1 mm (0.004 in) 7-6