1996-2006 Yamaha 115-140HP Outboards Service Manuals, Page 75Get this manual

1996-2006 Yamaha 115-140HP Outboards Service Manuals, Page 75

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CYLINDER, PISTON AND CRANKSHAFT
Do not scratch on the components such as combustion chamber, exhaust manifold and pistonUse round scraper for carbon deposit removal
Cylinder head 1 Inspect