Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 452Get this manual
IGNITION SYSTEM (2)To install the spark plug cap or high tension code, turn it clockwise until it is tightened2Measure: Spark plug cap resistance Out of specification ReplaceSpark plug cap resistance: 4.3: Measured value
3Measure: Ignition coil resistance Primary Out of specification ReplaceSecondary Out of specification ReplaceIgnition coil resistance Secondary Primary A