2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 269Get this manual

2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 269

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TRBL SHTG Symptom Low compression pressure

Check and adjust the throttle cable(s)Check the gaskets, spacer, and intake manifold (carburetor to cylinder head)
3-8 3-9 4-12 5-34