1998-2004 Honda Foreman 450 factory service manual, Page 70Get this manual
MAINTENANCE REUSING SPARK PLUG Clean the spark plug electrodes with wire brush or special plug cleanerCheck the gap between the center and side electrodes with wire-type feeler gaugeIf necessary, adjust the gap by bending the side electrode carefully
SPARK PLUG GAP: 0.80.9 mm (0.030.04 in) CAUTION:
To prevent damage to the cylinder head, handtighten the spark plug before using wrench to tighten to the specified torque
Reinstall the spark plug in the cylinder head and hand tighten, then torque to specification
TORQUE: 18 Nm 11.8 kgfom13 IbMt)
REPLACING SPARK PLUG
Set the plug gap to specification with wire-type feeler gauge (see above)