NGK 91064 SIMR8A9 Laser Iridium Spark Plug for Honda CBR/CRF

Vehicle Fitment

• Honda CBR250R
• Honda CBR300R
• Honda CRF250L / CRF250 series
• Honda CB300F/R
• Honda NSA700 (Integra)

Fitment Notes

• This is a motorcycle spark plug - no automotive vehicle applications are associated with this part per NGK's own product listing
• OE cross-reference: Honda 31916-MEH-003
• Specific model years weren't confirmed in the sources checked - cross-reference the OE part number against your bike's factory spec before ordering

Features

• Iridium alloy center electrode is six times harder than platinum for exceptional durability
• Square platinum electrode (SPE) design on the ground electrode provides strong ignitability and long service life in high-heat conditions
• Precision laser-welded fine-wire iridium tip delivers maximum spark energy for improved acceleration
• 98% pure copper core offers superior heat dissipation, conductivity, and ultra-wide heat range capability
• High-grade alumina silicate ceramic insulator reduces risk of overheating and dielectric punch-through
• Trivalent metal plating provides strong anti-corrosion and anti-seizing protection
• Rated for approximately 80,000-100,000 miles under normal use

Specifications

• NGK stock number: 91064
• Service/OE number: SIMR8A9
• Center electrode material: Iridium, fine wire
• Ground electrode: Platinum, square platinum electrode (SPE) design
• Torque spec: 7.2-10.8 lb-ft (cast iron), 7.2-8.7 lb-ft (aluminum)

Included Components

• 1x Spark Plug

Product Description

The NGK 91064 (SIMR8A9) is a Laser Iridium High Ignitability spark plug built for Honda's small-displacement single-cylinder motorcycle line, matching the factory Honda 31916-MEH-003 part number used across the CBR250R, CBR300R, CRF250, CB300, and NSA700. Its precision laser-welded fine-wire iridium center electrode delivers strong spark energy for improved ignitability and acceleration compared to standard nickel plugs.

The square platinum electrode (SPE) ground design is engineered specifically for high ignitability and long service life under sustained high-RPM operation typical of these single-cylinder engines. The high-grade alumina ceramic insulator and 98% pure copper core help manage heat and prevent overheating, while trivalent metal plating protects against corrosion and seizing over the plug's service life - NGK rates these plugs for roughly 80,000 to 100,000 miles under normal use.

This is a strong OE-quality replacement for Honda small-displacement motorcycle and dual-sport owners doing a routine ignition service. As a motorcycle-specific plug, it's not intended for automotive use - confirm your specific Honda model matches this application before ordering.