69D5G11 5-32987654321CrankcaseRemoving the oil seal housing1. Remove the oil seal housing 1.Removing the crankcase1. Remove the crankcase bolts in thesequence shown.NOTE:Insert a flat-head screw driver between thepry tabs to pry off the crankcase.Removing the crankshaft assembly1. Remove the crankshaft assembly and oilseal housing.Checking the cylinder bore1. Measure the cylinder bore (D1 — D 6) atmeasuring points a, b, and c, and indirection d (D1, D3, D5 ), which is parallelto the crankshaft, and direction e (D 2,D4, D 6), which is at a right angle to thecrankshaft.a: 10.0 mm (0.39 in) from the cylinder head topsurfaceb: 5.0 mm (0.20 in) above the exhaust portupper edgec: 5.0 mm (0.20 in) below the scavenging portlower edge69D5033069D5036069D50350169D50340Cylinder bore diameter (D1 — D6 ):72.000 — 72.020mm(2.8346 — 2.8354 in)Cylinder gauge 1:90890-06759