1983 Yamaha 30EN Outboards Service Manual, Page 162Get this manual
Maintenance specifications 1Engine _ Item Cylinder headWarp limit Model _
30ESN30ELN
0.1 mm (0.0039 in)
Lines indicate straightedge measurement
CylinderBore size Taper limit Out of round limit PistonPiston size Measuring pointPiston clearance Oversize 1st 2nd Offset Pi ston ring: Sectional sketch
72 mm (2 .83 in) 0.08 mm (0.003 in) .05 mm (0.002 in) 72 mm (2.83 in) 10 mm (0.39 in) 0.06 0.065 mm (0 .0024 72 .25 mm (2.84 in) 72 .50 mm (2.85 in)