1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 133Get this manual

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POWER LOSS

Fuel tank Fuel is deteriorated or dirty Fuel hoses Leakage, Bent, Kinked, Flattened, Broken Fuel filter .Clogged Fuel pump .Worn or broken, Gasket is cracked and leaky Carburet

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