NGK XR4IX 7189 Spark Plug

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Rating

3.8 / 5 Overall
NGK	XR4IX
Brand	Code
4.0 / 5 Materials
Copper	Iridium
Ground electrode	Center electrode
3.5 / 5 Design
Standard	Fine Wire
Ground type	Center type

Specifications

1mm (.039")	4
Gap	Heat range
⌀14mm	1.25mm
Thread diameter	Thread pitch
9.5mm (3/8")	21mm (13/16")
Reach	Hex size
Gasket	Solid
Seat	Terminal
1	Non-Projected
Ground count	Projection

Cross-reference and alternatives

Cross-reference (1)

Alternative spark plugs found in cross-reference docs provided by manufacturers

AP86

Copper-Platinum

3.2/ 5

.035"9.5mm, ⌀14x1.25HR 6

Same specs (1)

Products that have identical characteristics that impact interchangability

XR4

Copper

3.1/ 5

.039"9.5mm, ⌀14x1.25HR 4

One step colder (2)

Colder spark plugs with same characteristics for moderately tuned engines (75–100 hp increase)

XR5IX

Copper-Iridium

-

3.8/ 5

.039"9.5mm, ⌀14x1.25HR 5

XR5

Copper

3.1/ 5

.039"9.5mm, ⌀14x1.25HR 5