Mercury - RL82C Replacement Spark Plugs (4-Pack) Ignition Component Nickel Alloy & Copper Core Part Number 896329874. Overview. There's something reassuring about turning the key and hearing your engine fire up with that clean, confident spark you expect. These Quicksilver RL82C-replacement spark plugs bring that feeling back to your 25 horsepower Lightning outboard. They're small parts, sure but they shape every moment on the water. From the smooth burble as you idle out of the marina to the st