Honda EW170 Owner's Manual page 29

Spark plug service
Recommended spark plug: BR-4HS(NGK)
W14FR-U(ND)
To ensure proper engine operation, the spark plug must be properly gapped
and free of deposits.
1. Remove the spark plug cover.
2. Clean any dirt from around the spark plug base.
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3. Remove the spark plug cap.
SPARK PLUG COVER
PLUG'CAP
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