Segway Villain SX10 Owner's Manual page 69

Removal of Air filter housing assembly
The air filter housing assembly needs to be removed during engine maintenance,
and the spark plug and oil filling port are below
Remove the rear Cargo Bed
Loosen the M6×35 bolts fixing the air filter housing assembly with a tool, and
remove the bolts and bushings.
At this time, the air filter housing assembly and the air filter inlet pipe joint can be
turned up backwards, the spark plug is located below, and the spark plug can be
replaced.
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