7. CYLINDER HEAD/VALVES ATV 300/250 CAMSHAFT HOLDER ASSEMBLY Reverse the "CAMSHAFT HOLDER DISASSEMBLY" procedures. Align the cross cutout on the exhaust valve rocker arm shaft with the bolt of the camshaft holder. Camshaft Bearings CAMSHAFT INSPECTION Check each camshaft bearing for play or damage. Replace the camshaft assembly with a new one if the bearings are noisy or have excessive play. Inspect camshaft lobes for pitting/scratches/blue discoloration. Measure the cam lobe height. Service Limits: IN : 34.15 mm (1.366 in) EX: 34.05 mm (1.362 in) If any defects are found, replace the camshaft with a new one, then inspect lubrication system. 7-7