Segway SGW570F-A3 Manual page 158

MAINTENANCE
The spark plug is located under the cushion, please refer to
page 108 for removing the cushion.
1. Remove the ignition coil fixing bolts;
2. Take out the ignition coil;
3. The spark plug is located below the ignition coil. Use
tool to turn the spark plug cap 1/4 and remove it from
the spark plug.
4. Rotate the spark plug counterclockwise and remove it.
5. Inspect the spark plug
Spark plug normal status: The electrode part is grayish
white, grayish yellow or light brown, and the electrode gap is
about 0.6-0.8mm.
Spark plug to be replaced: The spark plug appears electrode
ablation, carbon deposition, clearance is too large, at this
time the spark plug should be replaced.
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