2009 Yamaha F40 Outboard Service Manual, Page 182Get this manual

2009 Yamaha F40 Outboard Service Manual, Page 182

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Power unit (check and adjustment) Pulser coil air gap a: 0.351.35 mm (0.0140.053 in)

Checking the valve clearance
Measure the valve clearances when the engine is coldDo not turn the