Description

Original NGK IMR9E-9HES 7556 Laser Iridium Spark Plug

The NGK IMR9E-9HES 7556 Laser Iridium Spark Plug is a high-specification motorcycle spark plug developed for modern, high-performance engines where precise ignition and dependable operation are essential. It combines an iridium center electrode with NGK’s Laser Iridium technology to provide a stable firing point, excellent resistance to electrode wear and consistent ignition performance.

With its compact 10 mm thread, 16 mm wrench size and 0.9 mm preset spark gap, the IMR9E-9HES is designed for specific high-output motorcycle applications. NGK lists this plug for several Honda motorcycles, including the CB1000R, CB650R, CBR600RR, CBR650R and VFR1200F, with exact fitment varying by model year and engine configuration.

NGK IMR9E-9HES 7556 Specifications

Specification	Details
Brand	NGK
Spark Plug Series	Laser Iridium
Spark Plug Type	Iridium
NGK Part Number	IMR9E-9HES
NGK Stock Number	7556
Center Electrode Material	Iridium
Center Electrode Design	Fine Wire
Ground Electrode	Platinum-tipped / Square Platinum Electrode (SPE)
Thread Diameter	10 mm
Thread Pitch	1.0 mm
Thread Reach	19 mm overall
Thread Length	12.7 mm + 6.3 mm extended section
Hex / Wrench Size	16 mm / 5/8 inch
Spark Gap	0.9 mm / 0.036 inch
Heat Range	9
Resistor	Yes
Resistance	5 kΩ
Seat Type	Flat / Gasket
Terminal Type	Stud
Ground Electrode Quantity	1

NGK’s Part Finder confirms the 10 mm thread, 16 mm wrench size and 0.9 mm gap for the IMR9E-9HES across applications such as the Honda VFR1200F, CB1000R, CB650R and CBR650R. Detailed aftermarket specifications identify the plug as heat range 9 with a 5 kΩ resistor and 0.036-inch preset gap.

What Makes the IMR9E-9HES 7556 Different

Fine-Wire Iridium Center Electrode

The IMR9E-9HES 7556 uses an iridium center electrode with a fine-wire firing tip. Iridium allows NGK to use a narrow electrode while maintaining excellent resistance to the intense heat and electrical erosion generated during repeated ignition events.

A smaller firing tip helps concentrate the ignition energy at a precise point. This supports dependable flame initiation and consistent combustion, particularly in motorcycle engines that operate at high RPM and under substantial thermal load.

Laser Iridium Technology

NGK’s Laser Iridium range is designed around OE-level ignition requirements, combining precious-metal electrode technology with construction intended for long-term durability.

The IMR9E-9HES incorporates an iridium center electrode and a platinum element on the ground electrode. This arrangement helps control electrode wear and maintain the intended spark geometry over the service life of the plug.

The ground electrode’s Square Platinum Electrode (SPE) design is specifically associated with NGK Laser Iridium High Ignitability plugs and is intended to provide consistent ignitability and wear characteristics.

Platinum Ground Electrode for Improved Durability

In addition to the iridium center electrode, the IMR9E-9HES features a platinum-tipped ground electrode. Using a precious-metal element on the ground side helps limit spark erosion and assists in maintaining the designed electrode relationship.

This is particularly relevant in high-temperature motorcycle engines, where the spark plug can experience frequent ignition cycles and demanding operating conditions.

Stable Ignition at High Engine Speeds

Motorcycle engines such as those used in the Honda CBR600RR, CBR1000RR, CB650R and VFR1200F are designed to operate across a broad RPM range. Maintaining a consistent spark is therefore important for smooth combustion and throttle response.

The fine-wire iridium center electrode and platinum ground electrode work together to maintain a controlled firing point. When correctly matched to the engine, this design can support reliable starting, consistent combustion and responsive operation.

NGK specifically lists IMR9E-9HES 7556 for several of these Honda applications.

Copper-Core Construction and Heat Management

The IMR9E-9HES uses a highly conductive copper-core construction beneath its electrode assembly. Copper provides efficient heat transfer, helping the spark plug manage the temperatures generated during combustion.

Effective heat dissipation is especially important for high-performance motorcycle engines because spark plugs must remain within their intended thermal operating range while exposed to repeated combustion cycles.

Trivalent Metal Plating

The plug features trivalent metal plating designed to provide strong resistance against corrosion and reduce the risk of seizure during installation and removal.

This type of plating is useful for motorcycle applications where spark plugs can be exposed to moisture, heat and changing environmental conditions.

5 kΩ Resistor for Electrical Noise Suppression

The NGK IMR9E-9HES  incorporates a 5 kΩ resistor. Resistor spark plugs help suppress electrical interference generated during the ignition process.

This is particularly useful in modern motorcycles equipped with electronic fuel injection, engine-management systems, sensors and other electronic equipment.

Key Features of NGK IMR9E-9HES 7556

• NGK Laser Iridium spark plug
• NGK Stock Number 7556
• Fine-wire iridium center electrode
• Platinum-tipped ground electrode
• Square Platinum Electrode (SPE) ground design
• High resistance to electrode wear
• Designed for stable and precise ignition
• 10 mm thread diameter
• 1.0 mm thread pitch
• 19 mm overall thread reach
• 16 mm / 5/8-inch wrench size
• 0.9 mm / 0.036-inch spark gap
• Heat range 9
• 5 kΩ resistor
• Flat/gasket seat
• Stud-type terminal
• Trivalent metal plating
• Suitable for selected high-performance Honda motorcycles

NGK IMR9E-9HES 7556 Motorcycle Applications

The IMR9E-9HES is primarily associated with selected Honda motorcycle applications. NGK’s catalog and Part Finder identify this spark plug for several models and engine configurations.

Honda CB1000R

The IMR9E-9HES 7556 is specified for selected Honda CB1000R applications, including the SC60/SC80 platform. NGK lists the plug for CB1000R models from 2008 onward in its Part Finder.

Honda CB650R

The plug is listed for the Honda CB650R, including the 650cc four-cylinder model introduced from 2019 onward. NGK identifies IMR9E-9HES as the standard plug for this application with a 0.9 mm gap.

Honda CBR650R

Selected Honda CBR650R models use IMR9E-9HES 7556. NGK lists the plug for CBR650R applications from 2019 onward, including ABS variants.

Honda CBR600RR

The Honda CBR600RR is another important application. NGK’s Part Finder lists IMR9E-9HES for selected 600cc CBR600RR models.

Honda CBR1000RR

The IMR9E-9HES 7556 is also listed for selected Honda CBR1000RR applications, including certain later-generation models.

Honda VFR1200F

NGK specifies IMR9E-9HES for the Honda VFR1200F, including the 2010–2016 1200cc V4 application. The plug is also listed for the VFR1200F DCT.

Compatible Honda Motorcycles at a Glance

Some notable applications associated with NGK IMR9E-9HES include:

• Honda CB1000R
• Honda CB1000R ABS
• Honda CB650R
• Honda CB650R ABS
• Honda CBR600RR
• Honda CBR650R
• Honda CBR650R ABS
• Honda CBR1000RR
• Honda CBR1000RR ABS
• Honda CBR1000RR SP
• Honda VFR1200F
• Honda VFR1200F DCT

Exact fitment depends on model year, engine designation, market and original equipment specification. NGK’s online Part Finder is region-specific, so vehicle compatibility should be checked against the exact motorcycle before ordering.

IMR9E-9HES vs Conventional Nickel Spark Plugs

The IMR9E-9HES differs significantly from a conventional nickel-electrode spark plug. Its precious-metal electrode configuration is designed to maintain a precise firing point for longer while supporting reliable ignition under demanding operating conditions.

Feature	Conventional Spark Plug	NGK IMR9E-9HES
Center Electrode	Nickel alloy	Iridium
Ground Electrode	Conventional nickel	Platinum-tipped
Electrode Design	Standard	Fine-wire / SPE
Wear Resistance	Standard	Enhanced
Heat Range	Application dependent	9
Resistor	Application dependent	5 kΩ
Series	Standard	Laser Iridium

Why Choose NGK IMR9E-9HES 7556?

The NGK IMR9E-9HES Laser Iridium Spark Plug is designed for motorcycle engines where OE-level ignition performance, electrode durability and precise spark characteristics are important.

Its combination of an iridium center electrode, platinum ground electrode, fine-wire firing design, 0.9 mm gap and 5 kΩ resistor makes it a specialized spark plug for compatible high-performance motorcycles.

For riders of motorcycles such as the Honda CB1000R, CB650R, CBR600RR, CBR650R, CBR1000RR and VFR1200F, the IMR9E-9HES can be an appropriate replacement when it matches the motorcycle’s specified spark-plug requirement.

Buy NGK IMR9E-9HES 7556 in Pakistan

If you are looking for the NGK IMR9E-9HES Laser Iridium Spark Plug in Pakistan, verify the exact motorcycle model, year and engine specification before purchasing.

The 10 mm thread, 19 mm reach, 16 mm hex, 0.9 mm gap and heat range 9 must match the engine’s required spark-plug specification. Using the correct plug helps ensure proper fitment and dependable ignition performance.