Yamaha Marine Outboards Factory Service / Repair/ Workshop Manual 225G 250B L250B, Page 51Get this manual
INSP ADJ
GENERAL
3Measure: Spark plug gap Out of specification RegapSpark plug gap 0.91.0 mm (0.0350.039 in)
4Tighten: Spark plug Spark plug 25 Nm (2.5 kgf, 18 ft lb)