Denso 4184 Spark Plug

Overview

Denso 4184 is a conventional spark plug built around a U-groove ground electrode design for improved ignitability and more efficient combustion. It uses a 5,000-ohm resistor, a copper core center electrode, and nickel electrode materials for dependable secondary ignition performance.

Key Features

• U-groove ground electrode design for stronger spark exposure
• 5000 resistance for stable ignition performance
• Copper core center electrode with nickel tip material
• Standard ground configuration with a 0.7 pre-gap
• Flat seat, 14.00 mm thread diameter, and 12.70 mm reach

Detailed Description

This Denso spark plug is engineered for engines that call for a flat-seat plug with a 14 mm thread and 12.70 mm reach. The U-Groove Conventional line focuses on ignitability, and the U-groove ground electrode helps expose the spark kernel more effectively for cleaner combustion and efficient engine operation. Denso 4184 is a direct fit for a range of small-displacement Kawasaki, Suzuki, and Honda applications, and it also cross-references DENSO Auto Parts W14FPR-U for the same application.

Compatible With 2003-2006 Kawasaki KDX50, 2004-2006 Kawasaki KFX50, 1994-2005 Suzuki JR50, 2002-2005 Suzuki LT-A50 QuadMaster, 1986 Suzuki FA50, 1982-1983 Honda NC50, 1963 Oldsmobile Cutlass, 1962-1963 Oldsmobile Jetfire, and 1962 Oldsmobile F85. Use Denso 4184 when replacing a worn plug on these applications and when the engine requires the listed thread, reach, seat, and heat range specifications.

Common Uses

• Restoring weak or inconsistent spark
• Addressing fouling from worn electrodes
• Replacing a plug with the wrong heat range or reach
• Correcting misfire concerns tied to ignition wear
• Maintaining efficient combustion in small engines and classic applications

Installation Notes

Verify thread diameter, reach, seat type, and pre-gap before installation. Confirm the engine specification against the vehicle application and set the gap to the required value if needed. Inspect the ignition system, plug wire, and coil condition during service to avoid repeat misfire issues.

Quality Assurance

Denso is known for OE-level ignition engineering, and the U-Groove Conventional line is built to deliver consistent spark exposure and reliable combustion performance. Part number 4184 is manufactured to match the listed application requirements.