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Spark plug NGK SILMAR8A9S (90992)
The NGK SILMAR8A9S spark plug is a high-quality iridium spark plug designed for gasoline engines where reliable ignition, longer life and stable performance are required. Thanks to advanced Laser Iridium technology, it offers a very thin iridium center electrode and a platinum disk on the ground electrode, which improves wear resistance and ensures consistent ignition even under higher engine loads.
This model is an ideal choice for motorcycles and some specific automotive applications where the manufacturer recommends spark plugs with an iridium electrode – its design contributes to faster starting, smoother engine operation, better fuel combustion and lower emissions.
Technical data
– Manufacturer: NGK – world-renowned manufacturer of spark plugs
– Designation: SILMAR8A9S
– Original part number: 90992
– Type: Laser Iridium spark plug
– Thread diameter: 10.0 mm
– Thread length: 26.5 mm
– Wrench size: 14 mm
– Distance between electrodes: approx. 0.9 mm
– Resistance: interference-free (resistor ~5 k?)
– Electrode material: iridium + platinum for longer life and better performance