6. CYLINDER HEAD/VALVES People GT 125i Measure the I.D. of each valve rocker arm. Service Limits: IN: 10.1 mm EX: 10.1 mm Measure each rocker arm shaft O.D. Service Limits: IN: 9.9 mm EX: 9.9 mm Measure arm to shaft clearance. Replace as a set if out of specification. Service limits: 0.1 mm ASSEMBLY Rocker Arm Shafts Apply engine oil to the rocker arms and rocker arm shafts. Install the rocker arms and shafts into the camshaft holder. · Install the exhaust valve rocker arm shaft on the "EX" side of the camshaft holder and the exhaust rocker arm shaft is shorter. · Clean the intake valve rocker arm shaft off any grease before installation. · Align the cutout on the exhaust valve rocker arm shaft with the bolt of the camshaft holder. 6-7