1998 Yamaha 25J, 30D, 25X, 30X outboards Factory Service Manual, Page 160Get this manual
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IGNITION SYSTEM
W (10P) BBW BY W
C arg coil Pulser coil DI nit gin sto itch Ig nitio coils ark plu gs
or 25J H, 25J25J30D H, 30D30D H, 30D xce pt for 25J25J30D30