Champion L78V Marine Spark Plug (sold individually)

Swap out those tired plugs and feel your Yamaha snap to life. The Champion L78V is purpose-built for two-stroke outboards—everything from classic 40 hp triples to punchy 90 hp inline fours—delivering a hot, consistent spark even with premix oil swirling through the cylinders. A copper-cored center electrode pulls heat away fast, while the nickel-alloy ground strap resists the salt-scale that loves to build up after a weekend of trolling. Factory-set at 0.030", the plug threads straight into your 14 mm head with its crush gasket already installed, sealing tight against combustion leaks.

Why your Yamaha will thank you:

• Copper core + nickel tip for cooler running and longer life in oil-rich two-strokes

• Ribbed, glazed insulator fights flash-over when humidity soars at the dock

• Solid terminal post fits Yamaha coil boots perfectly—no thread-on adapters to vibrate loose

• Electro-galvanized shell shrugs off salt mist and makes removal easy at the 100-hour mark

Spin in a fresh set of L78Vs, bump the choke, and enjoy crisp cold starts, steadier idle, and cleaner throttle jumps the next time you leave the ramp.