Denso 4129 U27FER9 Nickel Spark Plug

Denso spark plugs are 100% pre-fired to assure the highest quality possible. Machine rolled threads prevent seizing or cross threading during installation and removal. Purified alumina powder insulator provides exceptional strength and thermal conductivity. Five rib insulator prevents flashover. Copper-glass seal bonds center electrode and insulator for a gas-tight seal.

• Shell
• Thread Diameter10mm
• Thread Pitch1.0mm
• Seat TypeGasket
• Reach19mm (3/4")
• Hex Size18mm
• Terminal TypeThreaded Stud
• Overall HeightBantam
• Gap.035" (0.9mm)

• Center Electrode
• MaterialNickel
• TypeStandard
• Size2.5mm
• ProjectionNon-Projected

• Ground Electrode
• MaterialNickel
• TypeStandard
• Quantity1

• Specifications
• ResistorYes
• Resistor Value5k Ohm
• Heat Range27
• Torque SpecsCast Iron: 7-11 lb. ft. Aluminum: 7-11 lb. ft.

• Part Information
• BrandDenso
• Warranty12 Months
• Longevity20-30k Miles

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• 2006
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• 2004
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• 2003
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• 2002
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• 2001
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• 2000
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• 1999
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• 1998
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• 1997
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• 1996
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    • XR250R Base Verify fitment
• 1995
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• 1994
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    • CBR600F F2 Base Verify fitment
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• 1993
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• 1992
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• 1991
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• 1990
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• 1989
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    • NX250 Base Verify fitment
• 1988
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Non-Automotive

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