Honda TRX400EX FOURTRAX 1999, Service Manual

Page: 41 / 263

MAINTENANCE
Check the insulator for cracks or damage, and the
electrodes for wear, fouling or discoloration. Replace
the plug i f necessary (recommended spark plug:
page 3-1).
Clean the spark plug electrodes with a wire type
brush or special plug cleaner.
Check the gap between the center and side electrodes
with a wire-type feeler gauge. If necessary, adjust the
gap by bending the side electrode carefully.
SPARK PLUG G A P
0.6
-
0.7 mm (0.024
-
0.028
in)
CAUTION:
To prevent damage to the cylinder head, hand-tighten
the spark plug before using a wench to tighten to the
specified torque.
Reinstall the spark plug i n the cylinder head and
hand tighten, then torque to specification.
TORQUE 18
13
Connect the spark plug
VALVE CLEARANCE
NOTE:
Inspect and adjust the valve clearance while the
engine is cold (below
Remove the following:
- fuel tank and heat protector (page
- timing hole cap and crankshaft hole cap
- valve adjusting hole caps.
CENTER ELECTRODE
\
INSULATOR
S
IDE
3-7