NGK 9786 Spark Plug Wire Set

NGK Spark Plug Wire Set for OE-Style Ignition Service

NGK Spark Plug Wire Set 9786 is a specific-fit ignition wire set built for select Ford and Mazda applications. It uses blue silicone insulation, a 7.00 mm outside diameter, and a magnetic variable-pitch core with noise suppression to support stable spark delivery and reduced electrical interference.

Key Features

• Specific-fit spark plug wire set for confirmed vehicle applications
• Blue silicone insulation for heat resistance and durability
• 7.00 mm insulation outside diameter
• Mag (Var. Pitch) core material for ignition performance
• Noise suppression type: Yes
• NGK part number 9786 / RC-ZX19

Product Details

As part of the NGK Spark Plug Wire Set line, this ignition component reflects NGK’s long-standing OE-focused approach to replacement parts. NGK develops ignition products for domestic and import vehicles, with manufacturing and distribution support in North America and globally. Part number 9786 is intended for direct replacement use on select applications, including 1994-1997 Ford Aspire, 1990-1995 Mazda 323, 1990-1994 Mazda Protege, and 1992-1993 Mazda MX-3. It also fits 1990-1991 Mazda 323 SOHC applications. This part cross-references DENSO Auto Parts 671-4211 for the same application.

What This Wire Set Helps Address

• Misfires caused by worn or damaged ignition wires
• Hard starting related to weak spark transfer
• Rough idle from inconsistent ignition output
• Radio-frequency interference in the ignition system
• Heat-related wire breakdown on aging vehicles

Installation Notes and Tips

Verify engine configuration before installation, especially on Mazda 323 SOHC applications. Route the wires to match the original layout and keep them separated from hot exhaust components and sharp edges. Confirm each lead is fully seated at the coil and spark plug ends to maintain proper ignition contact. For best results, replace wires during routine ignition service when plugs or other ignition components show wear.

Quality Assurance

NGK is known for OE-level ignition engineering and broad vehicle coverage across domestic and import platforms. This wire set is manufactured to meet durability and operational performance expectations for replacement ignition service.