1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 46Get this manual
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ENGINE ASSEMBLY AND ADJUSTMENT 4-17 Important information 4-17 Piston!crankshaft 4-17 Oil seal housing 4-18 Cyl inder body 4-19 Cyl inder head Thermostat and thermostat cover 4-21 Exhaust covers 4-21