NGK MR7BI-8 spark plug

The NGK MR7BI-8 spark plug is a proven choice for motocross and enduro when you need a reliable start, smooth engine operation, and consistent performance. It helps maintain proper combustion even under heavy loads and is ideal as a replacement during servicing or as a spare plug for races.

reliable cold and hot starts

stable performance and smooth engine operation

suitable for demanding off-road conditions

ideal for quick pit changes / races

Socket size: 16 mm

External thread: 10 mm

Wire diameter: 19.0 mm

Removable SAE connector

Center electrode: Iridium

Outer electrode: standard design

Resistance: 5 kOhm

Seal: flat sealing seat

NGK Design Advantages (for longer service life)

Standard NGK spark plugs are designed for long service life and optimal performance even under load.

Triple-metal plating for excellent anti-corrosion and anti-adhesion properties

Corrugated insulator ribs prevent spark leakage

Aluminosilicate ceramic insulator for higher strength and better heat transfer

Copper core for efficient heat dissipation

Triple seal for protection against leakage

How to read NGK markings (letters and numbers)

The combination of letters and numbers on each NGK spark plug is not just a type designation, but a standardized code that precisely defines the spark plug’s design and properties. This makes it easier to select the correct spark plug for the engine (for original equipment manufacturers, service providers, workshops, and customers).

Positions 1–4 (letters): thread diameter, wrench size, and design type

Position 5 (number): heat range

Position 6 (letter): thread length

Position 7 (letter): special design features

Position 8 (number): electrode gap (coded)