2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 204Get this manual
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Electrical systems NOTE: The ignition spark can also be checked using the "Stationary test" of the Yamaha Diagnostic System
Spark plug wire resistance: #1: 4.510.7 #2: 3.38.0 #3: 3.78.9 #4: 4.31