2006 SD Johnson 4 Stroke 9.9-15HP Outboards Service Repair Manual P/N 5006590, Page 97Get this manual
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IGNITION SYSTEM TROUBLESHOOlNG
weak sparks Out of Spec
Check ignition coil resistance (Refer to page 99)Primay: 0.2O.4Q Seconday6.810.2 kQ
Replace the ignition coil