Denso 4184 W14FPR-U Nickel U-Groove Spark Plug

Denso U-Groove spark plugs feature a u-shaped groove in the ground electrode, giving the flame a groove to grow in, resulting in less flame dissipation and a larger flame front for a more complete combustion. This translates to better fuel efficiency and improved throttle response. Machine rolled threads prevent seizing or cross threading during installation and removal. 100% pre-fired to assure the highest quality possible. 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 Diameter14mm
• Thread Pitch1.25mm
• Seat TypeGasket
• Reach12.7mm (1/2")
• Hex Size13/16" (21mm)
• Terminal TypeRemovable Nut
• Overall HeightJIS
• Gap.028" (0.7mm)

• Center Electrode
• MaterialNickel
• TypeStandard
• Size2.5mm
• ProjectionProjected

• Ground Electrode
• MaterialNickel
• TypeU-Groove
• Quantity1

• Specifications
• ResistorYes
• Resistor Value5k Ohm
• Heat Range14
• Torque SpecsCast Iron: 26-30 lb. ft. Aluminum: 15-22 lb. ft.

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

Automotive

• 1963
  • Oldsmobile
    • Cutlass Base Verify fitment
    • Jetfire Base Verify fitment
• 1962
  • Oldsmobile
    • F85 Base Verify fitment
    • F85 Deluxe Verify fitment
    • Jetfire Base Verify fitment

Powersports

• 2006
  • Kawasaki
    • KDX50 Base Verify fitment
    • KFX50 Base Verify fitment
• 2005
  • Kawasaki
    • KDX50 Base Verify fitment
    • KFX50 Base Verify fitment
  • Suzuki
    • JR50 Base Verify fitment
    • LT-A50 QuadMaster Base Verify fitment
• 2004
  • Kawasaki
    • KDX50 Base Verify fitment
    • KFX50 Base Verify fitment
  • Suzuki
    • JR50 Base Verify fitment
    • LT-A50 QuadMaster Base Verify fitment
• 2003
  • Kawasaki
    • KDX50 Base Verify fitment
  • Suzuki
    • JR50 Base Verify fitment
    • LT-A50 QuadMaster Base Verify fitment
• 2002
  • Suzuki
    • JR50 Base Verify fitment
    • LT-A50 QuadMaster Base Verify fitment
• 2001
  • Suzuki
    • JR50 Base Verify fitment
• 2000
  • Suzuki
    • JR50 Base Verify fitment
• 1999
  • Suzuki
    • JR50 Base Verify fitment
• 1998
  • Suzuki
    • JR50 Base Verify fitment
• 1997
  • Suzuki
    • JR50 Base Verify fitment
• 1996
  • Suzuki
    • JR50 Base Verify fitment
• 1995
  • Suzuki
    • JR50 Base Verify fitment
• 1994
  • Suzuki
    • JR50 Base Verify fitment
• 1986
  • Suzuki
    • FA50 Base Verify fitment
• 1983
  • Honda
    • NC50 Base Verify fitment
• 1982
  • Honda
    • NC50 Base Verify fitment

Commercial & Industrial

• Pumps
  • Yamaha
    • YP 30 GK 4-Stroke Verify fitment
    • YP 30 GN 4-Stroke Verify fitment
    • YS524T Verify fitment
• Generators
  • Fuji Robin
    • RGX 370 Verify fitment
    • RGX 480 Verify fitment
  • Honda
    • EBK-Series Verify fitment
    • EB-Series Verify fitment
    • EM-Series Verify fitment
    • EMS-Series Verify fitment
    • E-Series Verify fitment
    • ES-Series Verify fitment
    • ET-Series Verify fitment
    • EV-Series Verify fitment
    • EX-Series Verify fitment
  • Kawasaki
    • GA 1800A Verify fitment
    • GA 2300A Verify fitment
    • GA 2300AS Verify fitment
    • GA 3200A Verify fitment
  • MQ Power
    • Robin EY-40DS Verify fitment
  • Yamaha
    • EF-Series Verify fitment

Lawn & Garden

• Concrete Saws
  • Elite
    • Robin Verify fitment
    • Onan OHV Verify fitment
  • Ditch Devil
    • Robin Verify fitment
    • Onan OHV Verify fitment
• Outdoor Power Equipment
  • Honda
    • H 45514 H EGX 360 KI Verify fitment
• Snow Thrower
  • Yamaha
    • YS 624 4-Stroke Verify fitment
    • YS 828 4-Stroke Verify fitment
    • YS524W Verify fitment
    • YS624W Verify fitment
    • YS828T Verify fitment
    • YS828W Verify fitment
• Mowers
  • Gravely
    • Robin 1-Cylinder Verify fitment