Honda PIONEER SXS500M 2020 Owner's Manual page 153

Spark Plug
6. Discard the spark plug if there is apparent wear or if the insulator
is cracked or chipped.
7. Using a wire-type feeler gauge, check the spark plug gap. If
adjustment is necessary, bend the side electrode carefully.
The gap should be:
0.039 – 0.043 in (1.00 – 1.10 mm)
UNDER SEAT BACK CENTER
spark plug cap
146 Servicing Your Honda
spark plug gap
0.039 – 0.043 in
(1.00 – 1.10 mm)
side
electrode
center
electrode