7. CYLINDER HEAD/VALVES MXU 300/250 CAMSHAFT INSPECTION Camshaft Bearings 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 (replace if below): IN : 34.15 mm (1.366 in) EX: 34.05mm (1.362 in) If any defects are found, replace the camshaft with a new one, then inspect lubrication system. INSTALLATION Dowel Pins Reverse the "CAMSHAFT REMOVAL" procedures. Note the following points: 1. Turn the flywheel so that the "T" mark on the flywheel aligns with the index mark on the crankcase. Keep the round hole on the camshaft gear facing up and align the punch marks on the camshaft gear with the cylinder head surface (Position the intake and exhaust cam lobes down.) and install the camshaft onto the cylinder head. (Refer to the "VALVE CLEARANCE" section in the chapter 3) 7-8