Honda EM50is Owner's Manual page 49

4.SPARK PLUG SERVICE
RECOMMENDED SPARK PLUG:
EM50is: BPR5ES (NGK)
W16EPR-U (DENSO)
EM65is: BPR6ES (NGK)
W20EPR-U (DENSO)
To ensure proper engine operation, the spark plug must be properly
gapped and free of deposits.
1.Loosen the cover screw and remove the spark plug inspection cover.
SPARK PLUG INSPECTION COVER
COVER SCREW
2.Disconnect the spark plug cap, and remove any dirt from around the
spark plug area.
3.Remove the spark plug with a spark plug wrench.
SPARK PLUG WRENCH
SPARK PLUG CAP
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