1983 Yamaha 30EN Outboards Service Manual, Page 162Get this manual
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Maintenance specifications 1 Engine _ Item Cylinder headWarp limit Model _
B2.0 mm (0.08 in)3.0 mm (0 .12 in)
End gap (Installed) Side clearance
B2.0 mm (0.08 in)3.2 mm (0.13