NGK LMAR9J-9E / 94162 Iridium Spark Plug Petrol Ignition Replaces 12129829073 Fits BMW 850 cc F850 GS, Adventure Fits BMW 895 cc F900 R, XRWith the smallest tip diameter available, OE Iridium spark plugs provide superior ignitability & long service life. The iridium/platinum surfaces ensure a slow wear rate, providing stable idle & superior anti-fouling. Laser-welded iridium center electrode tip Platinum disc welded to backside of ground electrode provides long life Trivalent metal plating for superior anti-corrosion & anti-seizing Faster starts & quicker acceleration Better fuel economy & lower emissions Best OEM Iridium spark plug available