2003-2004 GP1300R WaveRunner Service Manual, Page 51Get this manual
INSP ADJ
POWER UNIT
4Tighten: Spark plugs
Spark plug: 25 (2.5 kgf m, 18 ft lb)
NOTE: Before installing spark plug, clean the gasket surface and spark plug surfaceAlso, it is suggested to apply thin coat of anti-seize compound to the spark plug threads to prevent thread seizure If torque wrench is not available, good estimate of the correct tightening torque for new spark plug is to first finger tighten the spark plug and then tighten it another 14 to 12 of turn b