Honda WT20X Owner's Manual page 27

3. Spark plug service
Recommended spark plug:
BPR6ES (NGK)
W20EPR-U (DENSO)
To ensure proper engine operation, the spark plug must be properly
gapped and free of deposits.
The muffler becomes very hot during operation and remains hot for a
while after stopping the engine. Be careful not to touch the muffler
while it is hot.
1. Disconnect the spark plug cap, and remove any dirt from around the
spark the spark plug area.
2. Remove the spark plug with the proper size spark plug wrench.
MUFFLER
3. Visually inspect the spark plug. Replace the spark plug if there is
apparent wear, or if the insulator is cracked or chipped. Clean the
spark plug with a wire brush if it is to be reused.
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SPARK PLUG WRENCH