K3/Yixing/Rena Spark Plug 18846-10070 SILZKR7C11 Stable Ignition

K3, Yixng, RiNa (2000s onward) iridium spark plug 18846-10070 / SILZKR7C11; electrode material offers better high-temperature resistance and ignition stability than OEM nickel alloy. Improved threading and sealing reduce carbon buildup risk. OEM numbers 18846-10070 and SILZKR7C11 ensure stable ignition, improve combustion efficiency, reduce idle shake and acceleration stumble. Requires special socket to reach standard torque; recommended for users with basic DIY skills; otherwise have a professional shop handle; difficulty medium.