1983 Yamaha 30EN Outboards Service Manual, Page 160Get this manual
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APPENDICES SPECIFICATIONS
4,500 5,500 rmin 22.1 kW (30 hp)5,500 rmin 13 Qh (2 .86 Imp galh, 3.43 US galh) 2-Stroke 496 cm (cc) (30 .27 cin) 72 61 mm (2.83 2.4 in) 7.0: Reed valve Schniirle Prope