2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 75Get this manual

SPARK PLUG INSPECTION IGNITION TIMING CHECK
INSP ADJ

6.Measure: Plug gap Use wire gauge or feeler gaugeOut of specification RegapSpark plug gap: 0.60.7 mm (0.0240.028 in) 7.Tighten: Spark plug

18 Nm (1.8 kg, 13 ft lb)

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives