NGK IZFR6K-13 Laser Iridium Spark Plug for Honda City & Jazz — Complete India Fitment Guide

The Honda City is one of the most searched vehicles in India's automotive parts market. It has been on sale for decades across multiple generations, and each generation uses a different spark plug specification. The result is a marketplace cluttered with similar-looking NGK part numbers — IZFR6K-13, IZFR6K-11, DIFR6D13 — that are regularly confused with each other, leading to wrong orders, incorrect fitment, and wasted money.

The NGK IZFR6K-13 (NGK stock number 6774) is the Laser Iridium spark plug specified for the Honda City produced from October 2008 to September 2014, and for the Honda Jazz 1.2 MT. It uses a 14mm thread with a 19mm reach and comes pre-set to a 1.3mm electrode gap. The newer BS6 Honda City from 2020 onwards uses a completely different plug — the DIFR6D13, which has a 12mm thread and does not interchange with the IZFR6K-13.

This guide gives Honda City and Jazz owners a definitive reference for which plug they need, why the part numbers look so similar, and how to buy the right one.

Quick Answer

The NGK IZFR6K-13 (stock number 6774, Honda OEM cross-reference 12290-RB1-003) is the Laser Iridium spark plug for the Honda City produced from October 2008 to September 2014, and for the Honda Jazz 1.2 MT. It uses a 14mm thread, 19mm reach, heat range 6, and a 1.3mm pre-set gap. Both the City and Jazz 1.2 MT are 4-cylinder engines requiring 4 plugs per complete set. This plug does not fit the newer Honda City BS6 from 2020 — that generation uses the DIFR6D13 with a 12mm thread.

What Is the NGK IZFR6K-13?

The NGK IZFR6K-13 is a Laser Iridium spark plug from NGK's OEM co-development series. It features a laser-welded fine-wire iridium centre electrode and a platinum disc on the ground electrode, delivering consistent ignition performance and extended service life under the operating conditions of Honda's naturally aspirated i-VTEC petrol engines.

The part number suffix "-13" denotes a factory pre-set electrode gap of 1.3mm — a critical detail that distinguishes it from otherwise similar NGK part numbers for Honda applications. The NGK stock number is 6774, and Honda's OEM cross-reference for this plug is 12290-RB1-003 and 9807B-56A7W. Both cross-references refer to the same plug.

The Suffix Confusion Decoded — IZFR6K-13 vs IZFR6K-11 vs DIFR6D13

This is the section most Honda City and Jazz owners in India need most. Three NGK part numbers look nearly identical but are not interchangeable:

What the suffixes mean:

• The "-13" suffix = 1.3mm factory pre-set gap
• The "-11" suffix = 1.1mm factory pre-set gap
• The "D" prefix on DIFR6D13 = double iridium (different electrode construction) plus a 12mm thread

Why this matters:

The gap specification is set by the engine manufacturer for a specific combustion chamber geometry, coil energy output, and compression ratio. Fitting a 1.1mm pre-set plug where a 1.3mm is specified — or vice versa — changes the spark energy and flame kernel characteristics. In a naturally aspirated i-VTEC engine with variable valve lift, the gap specification works in concert with the combustion parameters across the VTEC operating range.

More critically: the DIFR6D13 has a 12mm thread and will not fit the 14mm threaded cylinder head of the older City. Attempting to install a 12mm plug in a 14mm head will result in incorrect seating, combustion gas leakage, and potential cylinder head damage. This is not a minor specification difference — it is a completely different plug physically.

Always confirm your plug by model year, not just by the car name "Honda City."

NGK IZFR6K-13 Technical Specifications

Note on thread size: The 14mm thread of the IZFR6K-13 is notably different from the 12mm thread used by all other plugs in this Auto Decode NGK series (LKR7BIX-P, ILZKR6Q11, ILKR9Q7G, IKR9J8, ILKR9Q7G). This distinction is important if you are cross-referencing specifications across different vehicle applications.

Which Honda City and Jazz Models Use the IZFR6K-13 in India?

The following fitment is sourced from the official NGK India 4-Wheeler Iridium Spark Plug Application Chart:

Honda City:

• City (Model from October 2008 up to September 2014)

This covers the 4th generation Honda City (2008 launch in India, known as the GM series) and the early portion of the 5th generation City sold in India up to the September 2014 boundary. These vehicles used the 1.5L L15A i-VTEC engine.

Honda Jazz:

• Jazz 1.2 MT (manual transmission, 1.2-litre variant)

Important model boundary notes:

The City produced before October 2008 uses a different plug specification — the IZFR6K-13 does not apply to the earlier generations. The City produced from February 2015 onwards (the newer 5th generation with updated engine and ignition system) uses the DIFR6D13 under the updated NGK India chart. The BS6 City from 2020 also uses the DIFR6D13.

For the Jazz, confirm your variant uses the 1.2L engine with manual transmission — the Jazz 1.5 MT & AT and the Jazz 1.2 AT are listed under different specifications in the NGK India chart.

If you are unsure exactly which generation your City belongs to, the quickest check is the production date on the registration certificate (RC book) under "Month and Year of Manufacture."

Honda i-VTEC Engine Context — Why It Matters for Ignition Specification

The Honda 1.5L i-VTEC engine used in the City (October 2008 – September 2014) is a DOHC (double overhead cam) naturally aspirated unit using Honda's proprietary i-VTEC (intelligent Variable Timing and Lift Electronic Control) system. i-VTEC combines valve timing control (VTC) with variable valve lift (VTEC) on both intake and exhaust camshafts.

In practice, i-VTEC means the engine operates differently across its RPM range — at low RPM, a shorter valve lift profile is used for efficiency and low-end torque; at higher RPM, the VTEC system switches to a higher-lift cam profile for maximum airflow and power. This transition creates a genuine change in the combustion environment: the air-fuel charge density, mixture turbulence, and flame propagation characteristics differ between the two VTEC states.

The spark plug must deliver reliable ignition across both operating modes — low-load city driving in the lower VTEC profile, and occasional higher-RPM driving in the upper VTEC profile. The IZFR6K-13's 1.3mm gap, heat range 6, and Laser Iridium electrode construction are the OEM-matched specification for this variable combustion environment.

This is why the specific gap of 1.3mm (not 1.1mm) matters: it is calibrated to the i-VTEC engine's coil energy output and combustion chamber geometry across both valve lift states.

Honda OEM Cross-Reference Number

The Honda OEM part number for this plug — 12290-RB1-003 — is useful for two reasons:

First, it allows Honda City owners to verify that what they are buying is the correct OEM-spec plug. When purchasing from a Honda authorised dealer's parts counter, this number is the reference the service adviser will use.

Second, it serves as an authenticity cross-check. A genuine NGK IZFR6K-13 purchased from a verified source will have both the NGK part number (IZFR6K-13 / stock number 6774) and the Honda OEM cross-reference (12290-RB1-003) listed on or inside the packaging. The presence of both references is a positive indicator of genuine sourcing — though it is not a guarantee on its own, as counterfeit packaging can also carry cross-references.

How Many Plugs Does Your Honda City or Jazz Need?

Both the Honda City 1.5L i-VTEC and the Honda Jazz 1.2 MT are 4-cylinder engines. A complete spark plug replacement requires exactly 4 plugs — one per cylinder.

The Set of 4 packaging is correctly sized for one full service on either vehicle.

There is no plug count ambiguity in this article — unlike the ILKR9Q7G guide which covered both 3-cylinder and 4-cylinder applications under the same part number, the IZFR6K-13 covers only 4-cylinder Honda engines in the Indian market.

Does the IZFR6K-13 Fit the Newer Honda City BS6 (2020 Onwards)?

No. This is the most consequential fitment mistake for Honda City owners in India.

The BS6 Honda City launched in India in 2020 uses the 1.5L DOHC VTEC engine with a revised cylinder head design requiring a 12mm thread plug — the NGK DIFR6D13. The IZFR6K-13 has a 14mm thread and will not correctly fit the newer City's cylinder head.

The Honda City sold in India from February 2015 to 2020 (5th generation facelift) also transitions to a different specification — the DIFR6D13 is the relevant plug for this period in the NGK updated India chart.

Summary of Honda City plug specifications by generation in India:

If you own a City produced between 2014 and 2015, confirm your exact production month and cross-check with the NGK India application chart or contact Auto Decode before ordering.

When Should You Replace Spark Plugs in a Honda City 1.5 i-VTEC?

For Laser Iridium-grade plugs in naturally aspirated i-VTEC engines, Honda's service documentation for these generations has referenced spark plug inspection and replacement at intervals around 40,000–50,000 km, though the exact interval must be confirmed from your specific vehicle's owner's manual.

For Honda City owners whose cars are now well beyond the production years covered by this plug (2008–2014), the service history may be incomplete — particularly for used vehicles that have changed hands. In these cases, visual inspection of the removed plugs is the most reliable condition assessment method, regardless of odometer reading.

Do not infer that Laser Iridium plugs are maintenance-free because they last longer than copper. An i-VTEC engine that spends most of its life in Indian city stop-and-go conditions at partial throttle will see more electrode deposit accumulation than one used predominantly on highways. The plug interval should reflect actual usage, not just the odometer.

Signs Your Honda City's Spark Plug Needs Attention

Honda City owners should watch for:

Rough or uneven idle, particularly after cold start or prolonged idling in traffic

The distinctive VTEC engagement hesitation becoming more pronounced than usual, or throttle response feeling duller below the VTEC crossover point

Hard starting, especially on cooler mornings

A noticeable decline in fuel efficiency compared to your usual figures

Engine vibration at idle that was not present before

Engine warning light with a misfire fault code (P030X series) from a scan tool

Slight stumble when accelerating from very low speeds

In an i-VTEC engine, spark plug wear can manifest in a slightly different way from a non-VTEC engine. The engine runs two distinct combustion profiles across its RPM range. A worn plug may still fire adequately in the lower-lift VTEC state (low RPM, city driving) but struggle during the cam profile switch to high-lift operation at higher RPM — producing a stumble or hesitation that owners sometimes incorrectly attribute to the VTEC system itself rather than the ignition.

If a scan tool shows a misfire code, the cylinder-specific nature of the fault helps narrow the cause. Inspect the plug for that cylinder first before assuming the ignition coil or injector is at fault.

Indian Driving Conditions and the i-VTEC Engine

The Honda City 1.5 i-VTEC is one of the most popular sedans in Indian city traffic. A significant portion of its operating life is spent in conditions that rarely trigger the VTEC high-lift profile: low-speed, partial-throttle, stop-and-go driving where the engine RPM stays well below the VTEC crossover point.

In these conditions, the engine is essentially operating as a conventional naturally aspirated unit with the lower cam profile. Prolonged low-load operation with frequent cold starts and incomplete warm-up cycles can lead to mild electrode fouling over time — carbon deposits accumulating on the plug tip when combustion is incomplete at partial load.

The Laser Iridium electrode's extended insulator nose helps the plug run at a self-cleaning temperature, burning off minor deposits more effectively than a conventional copper plug. The 1.3mm gap also ensures adequate spark energy for ignition reliability in the partially loaded combustion environment typical of Indian city driving.

Indian summer conditions add thermal stress to the underbonnet environment. The heat range 6 of the IZFR6K-13 is well-suited to the thermal profile of a naturally aspirated 1.5L i-VTEC — cooler than the heat range 9 used in turbocharged applications covered earlier in this series, reflecting the lower cylinder pressures and combustion temperatures of a non-turbo engine.

Buying Guidance — Genuine vs Counterfeit

Honda is one of the most widely owned vehicle brands in India, and NGK is one of the most counterfeited spark plug brands in the Indian market. The combination means the IZFR6K-13 sees a significant volume of counterfeit products in the informal parts channel — particularly for older City models where the independent aftermarket is the primary source of parts.

Identifying a genuine NGK IZFR6K-13:

Clear NGK Laser Iridium branding on the ceramic insulator and outer packaging

Part number IZFR6K-13 (note the hyphen) and NGK stock number 6774 correctly printed on the box

Honda OEM cross-reference number 12290-RB1-003 on or within the packaging

Made in Japan marking on both the plug and the box

Consistent, clean ceramic insulator finish with no surface defects

Precision-machined 14mm thread, hex, and metal shell

Safe purchasing channels:

Honda authorised service centres (parts counter) — most reliable source for the Honda OEM cross-reference

NGK-authorised distributors in India

Established automotive parts retailers with verified supply chains

Reputable online automotive platforms with verified sellers and return policies

What to avoid:

Unknown sellers on general marketplaces with no transaction history

Prices significantly below the established market rate for Laser Iridium plugs

Plugs sold without original NGK packaging

Listings that do not confirm whether the product is IZFR6K-13 specifically (not -11, not DIFR6D13)

A counterfeit IZFR6K-13 with an incorrect gap or inferior electrode material will not deliver the ignition consistency the i-VTEC engine is designed around, and can cause rough idle, hesitation around the VTEC crossover point, and over time, minor catalytic converter stress from incomplete combustion.

Fitment Checklist Before You Buy

Before purchasing the NGK IZFR6K-13 for your Honda:

Vehicle: Honda City or Honda Jazz

City production date: October 2008 to September 2014 only — confirm on your RC book

Jazz variant: 1.2 MT (manual transmission, 1.2L engine) — not Jazz 1.5 or Jazz 1.2 AT

Engine type: 1.5L i-VTEC naturally aspirated petrol (L15A family) for City; 1.2L for Jazz 1.2 MT

Thread size confirmation: 14mm — not 12mm (which is for the newer City/DIFR6D13)

Cylinder count: 4 — order 4 plugs

NGK part number: IZFR6K-13 (with hyphen; also written as IZFR6K13)

NGK stock number: 6774

Honda OEM cross-reference: 12290-RB1-003

Pre-set gap: 1.3mm — do not re-gap

Purchase source: Honda authorised dealer, NGK distributor, or verified retailer

Packaging check on delivery: part number, stock number 6774, Honda cross-reference, Made in Japan, Laser Iridium branding

Installation torque: use a torque wrench; refer to the Honda service manual for the L15A cylinder head torque specification for 14mm plugs

Auto Decode Expert Advice

The NGK IZFR6K-13 is the correct OEM Laser Iridium specification for the Honda City 1.5 i-VTEC (October 2008 – September 2014) and the Jazz 1.2 MT. It is a 14mm thread plug with a 1.3mm pre-set gap — physically and electrically different from the DIFR6D13 used in the newer City.

For Honda City owners maintaining a 2008–2014 vehicle, a few practical points worth keeping in mind:

These vehicles are now 10–15 years old. If you purchased the car used and the service records do not clearly document spark plug replacement, treat it as overdue regardless of the odometer reading. Ageing Laser Iridium plugs in a heavily city-driven i-VTEC engine can produce symptoms — dull throttle response, slightly rough idle — that owners attribute to engine wear but are often resolved by a fresh set of plugs.

Always order 4 plugs and replace all four together. Partial replacement leaves an imbalance in ignition quality across the cylinders that can reproduce symptoms even after the service.

If you are unsure whether your City needs the IZFR6K-13 or the DIFR6D13, check the production date on your RC book. October 2008 to September 2014 = IZFR6K-13 (14mm). From February 2015 onwards = DIFR6D13 (12mm). When in doubt, contact Auto Decode before ordering.

Conclusion

The NGK IZFR6K-13 Laser Iridium spark plug (stock number 6774, Honda OEM cross-reference 12290-RB1-003) is the correct ignition component for the Honda City produced from October 2008 to September 2014 and the Honda Jazz 1.2 MT. It uses a 14mm thread with a 1.3mm pre-set gap — distinguishing it from the IZFR6K-11 (1.1mm gap) and the DIFR6D13 (12mm thread, for the newer City). Both City and Jazz 1.2 MT are 4-cylinder engines requiring 4 plugs per complete set.

The production date boundary is the most important check before ordering — the BS6 City from 2020 and the updated 5th generation City from 2015 use the DIFR6D13, not this plug. Confirm your production date, confirm the 14mm thread, order 4 plugs, and buy from a verified source. These straightforward steps ensure you get the right plug for an engine that deserves to run at its designed specification.

FAQ SECTION

Which Honda City models in India use the NGK IZFR6K-13 spark plug?

The NGK IZFR6K-13 is specified for the Honda City produced from October 2008 to September 2014, and for the Honda Jazz 1.2 MT. This covers the 4th generation City and early 5th generation City sold in India during this period. The production date on your registration certificate (RC book) is the definitive reference. Honda Cities produced from February 2015 onwards use the DIFR6D13 — a different plug with a 12mm thread.

What is the difference between NGK IZFR6K-13 and IZFR6K-11?

Both plugs use the same 14mm thread and 19mm reach. The only difference is the pre-set electrode gap: IZFR6K-13 is factory pre-set to 1.3mm; IZFR6K-11 is pre-set to 1.1mm. These are not interchangeable — the gap specification is set by Honda for the specific i-VTEC engine's coil energy output and combustion chamber geometry. Always use the gap specification that matches your engine's requirement.

What is the difference between NGK IZFR6K-13 and DIFR6D13 for Honda City?

These are fundamentally different plugs. The IZFR6K-13 has a 14mm thread and is specified for the Honda City from October 2008 to September 2014. The DIFR6D13 has a 12mm thread and is specified for the newer City from 2015 onwards, including the BS6 City from 2020. A 12mm plug cannot be fitted in a 14mm cylinder head bore — these plugs do not interchange. Confirm your City's production date before ordering.

How many NGK IZFR6K-13 plugs does a Honda City or Jazz need?

Both the Honda City 1.5L i-VTEC and the Honda Jazz 1.2 MT are 4-cylinder engines. A complete replacement requires exactly 4 spark plugs — one per cylinder. The Set of 4 packaging is correctly sized for one full service on either vehicle.

What is the Honda OEM cross-reference number for the NGK IZFR6K-13?

The Honda OEM cross-reference numbers for the IZFR6K-13 are 12290-RB1-003 and 9807B-56A7W. These can be used to verify the part when purchasing from a Honda authorised service centre or cross-referencing with Honda's parts catalogue.

What does the "-13" suffix mean on the NGK IZFR6K-13?

The "-13" suffix denotes a factory pre-set electrode gap of 1.3mm. NGK uses numerical suffixes to indicate pre-set gap specifications — so "-11" means 1.1mm, "-13" means 1.3mm, and so on. These are precision pre-set at the factory and should not be adjusted manually. Buying the correct suffix is as important as buying the correct base part number.

How often should I replace spark plugs in a Honda City 1.5 i-VTEC?

Refer to your Honda City owner's manual for the exact interval. Available service documentation for these i-VTEC City generations has referenced spark plug replacement around 40,000–50,000 km for Laser Iridium grade plugs. For used vehicles with incomplete service history, a visual inspection of the removed plugs is the most practical condition assessment.

Can I re-gap the NGK IZFR6K-13 before installation?

No. The IZFR6K-13 is a Laser Iridium plug pre-set to 1.3mm at the factory. The fine-wire iridium electrode and platinum disc on the ground electrode are precision-manufactured components that must not be adjusted with conventional gapping tools. Install the plug as supplied.

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