Product Overview 

The unique layout of the boxer engine places the spark plugs in extremely tight, recessed locations, often requiring engine support or specialized procedures for access. This HKS kit is a streamlined, cleverly designed solution that provides the precise reach, articulation, and socket engagement needed to remove and install spark plugs directly, saving significant time and hassle.

Product Highlights

🔧 Engine-Specific, SST-Free Design
Designed from the ground up for the FA20/FA24 engine’s spark plug wells. The included plug socket and extension bars provide the exact length and configuration to reach the plugs without requiring you to use an engine support bar or follow the factory’s more invasive SST procedure.

🔄 Modular Extension System for Tight Spaces
The kit includes three extension bars (two 32mm, one 50mm) that can be combined or used individually. The connection points feature a specially calibrated locking ball mechanism that is easy to engage and disengage even when working by feel in confined spaces, yet holds securely during use.

⚙️ Dual-Drive Flexibility for Maximum Access
The rear of the plug socket is machined with a 17mm hex shape, allowing you to turn it with either a standard 3/8″ drive ratchet or a simple open-end wrench. This dual functionality is crucial for navigating around engine mounts, hoses, and other obstacles where a standard ratchet cannot fit.

🏁 Quality Construction with HKS Branding
Tools are made from durable steel to withstand professional use. Clean HKS lettering is engraved on the components, signifying the tool’s performance-oriented heritage and quality.

Technical Specifications

• Product Name: Spark Plug Wrench Set for FA20/FA24

• Compatibility: Engines: Subaru/Toyota FA20 & FA24 horizontally opposed engines (GR86/BRZ, etc.).

• Drive Size: 3/8″ (9.5mm) square drive.

• Kit Contents:

  • Spark Plug Socket: 1

  • Extension Bars: 32mm (x2), 50mm (x1)

• Key Feature: 17mm hex on socket rear for wrench access.

Performance Philosophy

• Goal: To empower owners and technicians to perform critical spark plug service quickly, correctly, and without unnecessary complexity. The focus is on practical problem-solving, precision fitment, and time savings for a notoriously difficult job.

• Focus: An essential specialized tool for the boxer engine owner. This is not a generic toolkit addition; it is a single-purpose solution that pays for itself by enabling a proper DIY service or streamlining a professional technician’s workflow.

Usage & Installation Notes

• 🔧 Procedure & Tips

  1. Attach the plug socket directly to the spark plug in the well.

  2. Connect the appropriate combination of extension bars to reach the socket.

  3. Use a 3/8″ ratchet on the extension or a 17mm wrench on the socket’s hex to break the plug loose.

  4. Note: The locking ball is intentionally designed to be weaker to aid disassembly in tight spaces. The plug socket may occasionally stay on the spark plug when removing the extensions. If this happens, use a different extension bar to retrieve the socket.

How to use

Remove the plug