2006-2009 Honda TRX250EX/TRX250X Service Manual, Page 62Get this manual
MAINTENANCE Check the following and replace if necessary (recommended spark plug: page 4-21 insulator for damage electrodes for wear burning condition, coloration;dark to light brown indicates good condition- excessive lightness indicates malfunctioning ignition system or lean mixture- wet or black sooty deposit indicates over-rich mixture
INSULATOR
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 carefullySPARK PLUG GAP: 0.80.9 mm (0.030.04 inl
To prevem damage !O the cylinder head, hand tighten Ihe spark plug before using wrench 0 tighten to the specified