1996-2006 Yamaha 115-140HP Outboards Service Manuals, Page 217Get this manual

1996-2006 Yamaha 115-140HP Outboards Service Manuals, Page 217

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Idle speed: 750 50 rmin

Measuring steps: Start the engine and allow it to warm up for few minutes Attach the tachometer to the high tension lead of the cylinder #