11/16" (18mm) deep well socket
NGK Plug DPR8EA9
Spark plugs use SAE and not Metric. The one that fits it is the one that fits it.
18MM
5/8"
Get a spark plug socket and wrench that fits the plug body and remove it by turning counter-clockwise.
18 mm
The CR9EH-9 spark plug needs a 16mm or 5/8" socket.
dpr8ea9 is a resistor plug dp8ean is non resistor.
most 50cc 4 stroke takes 5/8
18 mm spark plug socket
You will need either a spark plug wrench or socket that fits the plug. The socket will need to be not only the right size, it will need to be deep enough to allow the socket to engage the nut built into the plug. Be careful not to force the plug if it is seized as breaking it off leads to major projects. Most plugs unscrew easily.
5/8 inch spark plug socket.5/8 inch spark plug socket.