DENSO Nickel TT Spark Plug 4 Pack • K20TT

Suitable for Mazda MX-5 Mk1 / NA 1.6 and Mazda MX-5 Mk2 / Mk2.5 NB 1.6 petrol models as listed below. Supplied by MazSpec as a complete pack of 4 spark plugs.

DENSO K20TT is a Nickel TT spark plug designed as a quality aftermarket replacement for compatible Mazda ignition applications. This MazSpec listing supplies four plugs, providing the quantity required for a complete spark-plug change on the four-cylinder MX-5 applications listed.

DENSO's Nickel TT design uses two fine 1.5 mm nickel-alloy electrode tips: a reduced-diameter centre electrode and a projecting ground electrode. This Twin Tip arrangement reduces obstruction around the initial spark and is designed to provide dependable ignitability and stable everyday combustion performance.

Product Specifications

• Brand: DENSO
• Product range: Nickel TT
• Part number: K20TT
• DENSO secondary / long part number: 267700-7441
• GTIN / EAN: 042511046047
• Plug type: Nickel TT spark plug
• Centre electrode: 1.5 mm fine-tip nickel alloy
• Ground electrode: 1.5 mm projecting fine-tip nickel alloy
• DENSO heat range: 20
• Thread diameter: 14 mm
• Thread size: M14 x 1.25
• Thread reach: 19 mm
• Hex / spanner size: 16 mm
• Spark gap: 1.0 mm
• Projection: 1.5 mm
• Spark position: 3.0 mm
• Terminal type: Solid SAE
• Resistor: 5 kΩ
• Recommended tightening torque: 22 Nm
• Quantity required per MX-5: 4
• Quantity supplied: 4 spark plugs

Typical Reasons for Replacement

Spark plugs are routine ignition-system service components and may require replacement because of normal electrode wear, accumulated mileage or scheduled servicing. Worn or unsuitable plugs can contribute to difficult starting, an uneven idle or ignition misfire, although these symptoms can also have other causes and should be diagnosed correctly.

Fitment Advice

This MazSpec K20TT listing is allocated to the 1.6-litre MX-5 applications shown in the compatibility table. It should not be selected for an MX-5 1.8 purely because another application uses a spark plug with similar dimensions.

Replacing all four plugs together is recommended. Ensure the plug wells are clean before removing the old plugs, start each new plug carefully by hand to avoid cross-threading and tighten using the appropriate service procedure and torque specification.

The plugs are supplied to the stated DENSO specification. Do not alter the spark-plug gap unless the relevant vehicle or DENSO service information specifically requires it.

For imported, modified or previously repaired cars, matching the part number or component style on the part being replaced is recommended.

Other Items to Consider

• Ignition leads where fitted
• Ignition coils
• Engine air filter
• Engine oil and oil filter when completing a routine service

Useful Tools / Consumables

• 16 mm spark plug socket
• Suitable extension and ratchet
• Torque wrench
• Compressed air or suitable cleaning equipment for the spark-plug wells

Difficulty Guide

DIY Difficulty: Easy to Moderate. Spark-plug replacement is a routine service operation, but careful thread engagement and correct tightening are important to avoid damage to the cylinder head or spark plugs.

Why DENSO?

DENSO is a long-established ignition manufacturer, with aftermarket spark plugs engineered for reliable starting, stable combustion and dependable service performance. Its Nickel TT range uses DENSO's Twin Tip electrode technology to provide improved ignitability while retaining durable nickel-alloy electrode construction.

What's in the Box?

• 4 x DENSO K20TT Nickel TT spark plugs

Installation Notes

Install only into a cool engine. Start each plug by hand before tightening, avoid cross-threading and use the appropriate torque procedure. Do not over-tighten the plugs or apply additional thread treatments unless specifically required by the applicable service information.