NGK NGK Iridium IX Spark Plug P/N:6747
NGK 6664 spark plug for the 1979 Honda Accord 4-cylinder 1.8L and other vehicles fires the spark that ignites the air-fuel mixture in each cylinder. This NGK Iridium IX spark plug is recommended for modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs.
Hard starting, a rough idle or a misfire can mean a plug is worn. These signs alone do not prove the plug is at fault, since a weak ignition coil can cause them too. This listing is one plug, and the engine takes one per cylinder.
NGK spark plugs with this number are listed for a wide range of makes and models, including the 2006-2018 KTM 250 XC-W 249cc and the 2006-2018 KTM 300 XC-W 293cc. If your vehicle is not named here, search the "Vehicles it fits" section on this page for your model, year and engine.
Fit and size
Build and materials
Interchange: BR7EIX
This part cross-references / interchanges with the following part numbers:
Is NGK 6664 a Honda Accord spark plug for the 1979 model with the 4-cylinder 1.8L engine?
Yes. NGK 6664 fits the 1979 Honda Accord 4-cylinder 1.8L, which takes four, one per cylinder. For other vehicles, look them up in the "Vehicles it fits" section.
Is this among the NGK spark plugs with a copper core?
Yes. NGK 6664 has a solid copper core of 98% pure copper, with a fine wire 0.6 mm iridium tip on the center electrode.
What size are NGK iridium spark plugs like the 6664?
The NGK 6664 has an M14 - 1.25 thread. Its fine wire iridium tip on the center electrode measures 0.6 mm.
Is BR7EIX the same plug as this one among the NGK R spark plugs?
Yes. BR7EIX is the second NGK number for this plug, so 6664 and BR7EIX are the same Iridium IX spark plug.
What does the tapered cut ground electrode do on this spark plug?
Its reduced quenching design is built to give the NGK 6664 outstanding ignitability, improved acceleration, fuel efficiency and durability.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.