NGK Iridium Spark Plug IMR9C-9H – 6777

The NGK IMR9C-9H Iridium Spark Plug is a premium performance spark plug designed to provide excellent ignitability, improved throttle response, reliable starting and stable combustion.

Featuring an ultra-fine iridium alloy centre electrode, the IMR9C-9H produces a strong, consistent spark while requiring less voltage for ignition. This helps the engine burn the air/fuel mixture efficiently and maintain dependable performance across a wide range of riding conditions.

Suitable for selected Honda motorcycles including the CBR1100XX Super Blackbird, CBR600F/F4i/FS, CBR600RR, CBR929RR and CBR954RR FireBlade.

Features

• Genuine NGK Iridium spark plug
• NGK Part Number: IMR9C-9H
• Stock Number: 6777
• Ultra-fine iridium centre electrode
• Excellent ignition performance
• Improved throttle response and acceleration
• Helps provide stable engine starting and idling
• Designed for efficient combustion
• Wide operating heat range
• High-quality ceramic insulator
• Strong, airtight construction
• Insulator corrugations help prevent flashover
• Premium replacement plug for standard engines

Specifications

Brand: NGK
Part Number: IMR9C-9H
Stock Number: 6777
Type: Iridium Spark Plug
Terminal: Screw Type
Thread Diameter: 10.0mm
Thread Length: 19.0mm
Hex Size: 16.0mm
Heat Range: 9

DENSO Cross Reference

Compatible DENSO references include:

• IUH27D
• VUH27D
• VUH27Z

Honda OEM Cross Reference

The IMR9C-9H is listed against the following Honda OEM spark plug part numbers:

• 31912-MBW-E11
• 31922-MBW-E12
• 98059-5992U

Iridium Performance

The ultra-fine iridium centre electrode allows the spark to form efficiently, helping improve ignitability and combustion.

Compared with a conventional spark plug, this design can provide a sharper response when opening the throttle, improved starting characteristics and smoother, more stable engine operation.

Actual performance improvements can vary depending on the motorcycle and condition of the engine.

NGK Wide-Range Technology

NGK uses a copper-core centre electrode designed to transfer heat efficiently away from the firing end.

Combined with NGK's high-alumina ceramic insulator, this provides excellent electrical insulation, heat conductivity and resistance to thermal shock.

Corrugations incorporated into the insulator increase the surface distance between the terminal and metal shell, helping prevent high-voltage flashover.

Fitment

Honda CBR1100XX Super Blackbird

• 2001 onwards
• SC35
• 1100cc
• 4 plugs required

Honda CBR600F

• 2001 onwards
• Re-import models
• 600cc
• 4 plugs required

Honda CBR600F4i

• 2001 onwards
• PC35 re-import
• 600cc
• 4 plugs required

Honda CBR600FS

• 2001 onwards
• Re-import models
• 600cc
• 4 plugs required

Honda CBR600RR

• 2003–2004
• Re-import models
• 600cc
• 4 plugs required

Honda CBR929RR FireBlade

• 2000–2001
• SC44
• 929cc
• 4 plugs required

Honda CBR954RR FireBlade

• 2002–2003
• SC50
• Reverse import
• 954cc
• 4 plugs required

Benefits

• Strong and consistent ignition
• Improved throttle response
• Reliable cold and hot starting
• Stable idle performance
• Efficient combustion
• Premium iridium electrode technology
• Excellent durability
• Ideal for servicing compatible Honda sports motorcycles

Important Information

• This listing is for 1 × spark plug.
• Motorcycles listed above require 4 plugs for a complete engine replacement.
• Please confirm the IMR9C-9H specification against your motorcycle before ordering.
• Fitment information may vary depending on model, year and market specification.
• Ensure the terminal configuration is compatible with your motorcycle's plug caps.
• Spark plugs should be installed to the motorcycle manufacturer's specified procedure and tightening torque.
• Any supplied instructions may be written in Japanese.
• Performance improvements can vary depending on the motorcycle and engine condition.

NGK Iridium – Precision Ignition for Honda Performance Motorcycles

The NGK IMR9C-9H combines iridium electrode technology with NGK's proven spark plug construction to deliver reliable ignition, responsive performance and dependable combustion for compatible Honda motorcycles.