GENUINE MOTORCYCLES G400C, Owner'S Manual, Page: 39 / 74

Spark Plug
Remove the spark plug cap, then remove the spark plug with a
socket wrench. Visually check whether there is damage to the
spark plug insulator or electrodes. If damage has occurred, replace
the spark plug. Check the spark plug electrode gap with a plug
gauge. Spark plug electrode gap 0.6 -0.7mm. Carefully adjust
t h e electrode gap.
Carefully remove any accumulated carbon and c o n t a m i n a n t s
with a spark plug cleaner or soft wire brush. Ensure the spark
plug washer is in good condition.
Insert the spark plug, hand-tighten the spark plug first, and then
tighten it with a socket wrench. Replace the spark plug cap.
Timing phase
The timing should be verified when the vehicle is new or
there is any question about the timing phase.
Remove the eyehole cover on the left and the upper
eyehole cover.
Turn the crankshaft pulley Counterclockwise to align
the scale line “ I ” with the indication mark “ ” on the
front-left cover.
Caution
At this point, the piston must be at top dead center
on the compression stroke rather than the exhaust
stroke.
Remove the cam phase sensor on the right of the
cylinder head, and check whether the boss of the driven
sprocket is in the center of the cam phase sensor hole.
Use a small reflective mirror if necessary to help
observation.
Upon completion of inspection, mount the cam
phase sensor, eyehole cover and upper eyehole cover.
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