Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 128Get this manual

Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 128

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INSP ADJ
CONTROL SYSTEM
Measuring steps: Start the engine and allow it to warm up for several minutes8 Attach the engine tachometer to the spark plug lead of cylinder #1 Engine tachometer: