NGK Spark plug
Discover all our NGK spark plugs at exceptional prices!
NGK is an American company specializing in spark plugs. NGK spark plugs, which equip a large number of 50cm3 scooters, are renowned for their quality. We offer NGK spark plugs for original engines, as well as Racing spark plugs for high-performance engines. Our store offers a wide range of NGK spark plugs at very competitive prices.
Short base candle
B7HS, B8HS, B9HS, B10HS, BR7HS, BR8HS, BR9HS.Candle long base
B7ES, B8ES, B9ES, B10ES, BR7ES, BR8ES, BR9ES.Platinium short and long base candles
B9HVX, B8EVX, B9EVX, B10EVX, B10HVX.Iridium long base candle
BR9EIX, BR10EIX.Gold Palladium long base candle
BP-E10, B-E10, B-E10,5.4-stroke and injection spark plugs
CPR8E, CR7HSA.
The spark you need!
The spark plug is a component of the ignition system that creates a spark thanks to the high voltage supplied to the electrodes by the coil. To ignite a fluid, you need an oxidizer, a fuel and a heat source. In an engine, the oxidizer is air, the fuel is gasoline and the heat source is provided by the spark plug. The upper part of the NGK spark plug is connected to the high-voltage coil of the ignition system by means of a suppressor. The shape of the NGK spark plug prevents accidental disconnection due to engine vibration or road conditions. The electrodes are electrical conductors between which the spark required to ignite the fuel is generated. The distance between electrodes is set by the engine manufacturer according to the compression ratio, the fuel used, the power of the ignition coil and the expected energy. The electrodes are generally coated with nickel, silver or platinum alloys, since electrodes that are too hot can cause the engine to pre-ignite, and damage the piston. The NGK spark plug must also dissipate heat to the cylinder head. This is why: the electrical insulator must have good thermal conductivity, and the spark plug's contact with the cylinder head must be perfect.
Most of the heat is dissipated through the thread and sealing ring. The rest of the heat is dissipated through the top of the NGK spark plug to the cylinder head. A thermal index is established to determine the spark plug's response to different engine temperatures. Cold" spark plugs have a low thermal coefficient, low heat absorption and good heat dissipation. They are therefore designed for high-performance engines subject to high temperatures, while "hot" spark plugs have a high thermal coefficient, high heat absorption and low heat dissipation. In practical terms, the thermal index of a spark plug can be varied by adjusting the length of the insulator spout: the spout is longer for a hot plug. In a cold candle, the path between electrode, insulator and base is shorter.