Product Overview

This S-R6A12 is supplied for engine overhaul and top-end rebuild projects on MWM TCG 2020 and C-A-T CG 170 gas engines. Plants ordering for a scheduled E40/E50 service or a full top-end overhaul typically replace the complete plug set at once rather than one unit at a time.

For overhaul planning, three things matter: correct part number, consistent quality across the set, and availability when the unit is open. We keep this plug in stock, and every piece is gauge-checked so the set you install behaves uniformly across all cylinders — no chasing a single misfiring hole afterwards.

This spark plug series is widely applied in CHP plants, biogas stations, landfill gas projects and distributed power generation, where stable ignition directly determines electrical efficiency and heat recovery performance.

Lead time planning: most items are stocked for immediate shipment; if an item is not in stock, allow 30 days. For planned outages, order ahead of the shutdown date rather than during it.

Technical Specifications

Compatibility & Cross Reference

Note: OEM numbers are listed for reference only. Please confirm fitment against your engine model and serial number before ordering — we are happy to check it for you.

Why This Plug Performs

Package Reference

Standard packaging options are shown below. We can also supply neutral (unbranded) packing or fully customized packaging to your own artwork, logo and carton specification.

Bulk carton packing

Palletised packing

Export crate — wrapped & strapped

Packing configuration (pieces per carton, carton dimensions and gross weight) can be adjusted to your handling and warehouse requirements — please advise your preference when ordering.

Packing, Delivery & Customization

Production & Quality Control

Every TAKUMI plug comes off a vertically integrated line: precision grinding, laser welding, ceramic sintering and a full electrical test. Batch numbers are recorded for full traceability.

The stations below are the ones every production batch passes through — pressure and leakage, spark voltage analysis, ceramic high-voltage resistance, and an aging run. A plug only ships once it has cleared all four.

Pressure & leakage test

Spark voltage analysis

Ceramic high-voltage resistance test

Aging test

Quality is checked at the point of manufacture rather than at the point of complaint. That is what keeps behaviour consistent from the first plug of a set to the last.

Our production and quality system:

• Produced in ISO 9001 and IATF 16949 certified facilities.
• 100% tested before shipment — spark gap, resistance and seal checked unit by unit.
• Factory-direct supply chain, so specification consistency is maintained batch to batch.

FAQ

Q: How do I know it fits my engine?
A: Send us your engine model and serial number, or the OEM part number currently in the engine. We will cross-check it against our reference list and confirm before you order.

Q: Can you supply under our own brand?
A: Yes — unbranded, your brand/logo, or custom packaging. Minimum quantities apply for custom branding.

Q: What is the minimum order quantity?
A: 20 pcs per item.

Q: What if a plug fails?
A: We warrant our spark plugs against manufacturing defects for a limited period from delivery. Spark plugs are consumable items: the warranty does not cover normal wear, damage from incorrect installation, engine faults, fuel or gas quality problems, or use outside the specified application.

Q: Can I fit this without changing engine settings?
A: Yes. The S-R6A12 reproduces the original thread, reach, seat and gap, so it is a drop-in replacement. No ECU or ignition-parameter change is needed.

Get a Quote

Send us the engine model, the number of cylinders and your overhaul date — we will confirm the quantity and shipping schedule to match your shutdown window.

TAKUMI JAPAN AUTO PARTS CO., LTD.  |  Takumi, a Symbol of Quality & Reliability!