7. CYLINDER HEAD/VALVES MXU 250R/300R 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) Check the stop plate spring for damage. Replace the stop plate assembly with a new one if the spring is damage. Spring Rocker Arms Stop Plate 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. Rocker Arm Shafts 7-7