NGK standard spark plugs are constructed for longer life and optimum performance. They feature trivalent metal plating for superior anti-corrosion and anti-seizing properties, corrugated ribs to prevent flashover, and a pure alumina silicate ceramic insulator for superior strength and better heat transfer. The copper core aids in heat removal, and triple seals prevent leakage. Specifications: Thread Diameter: 10mm Thread Pitch: 1.0mm Seat Type: Gasket Reach: 26.5mm (1.04') Hex Size: 9/16' (14mm) Terminal Type: Solid Gap: .035' (0.9mm) Center Electrode Material: Nickel, Type: Standard, Size: 2.5mm, Projection: Projected Ground Electrode Material: Nickel, Type: Standard Resistor: Yes, Resistor Value: 5k Ohm Heat Range: 8 Features: Extended center electrode Torque Specs: Cast Iron: 7.2-10.8 lb. ft. Aluminum: 7.2-8.7 lb. ft. This spark plug is compatible with various Moto Guzzi models including Audace, California, and MGX21.