Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 149Get this manual
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DIRECT FUEL INJECTION
End Gap Top Ring Middle Ring Bottom Ring
0.0059 0.0098 in(0.15 0.25 mm) 0.0059 0.0098 in(0.15 0.25 mm) 0.0039 0.014 in(0.10 0.35 mm) 0.010 in(0.25 mm)