Check This Yamaha 4-Stroke Outboard Spark Plug Chart
Finding the right replacement for your motor usually starts with a solid yamaha 4-stroke outboard spark plug chart to make sure you aren't putting the wrong heat range into your expensive engine. There's nothing quite as frustrating as heading out to the ramp, dropping the boat in, and realizing the motor is idling like a lawnmower because the plugs are fouled or just plain wrong. It happens to the best of us, and honestly, with how many different models Yamaha has put out over the last twenty years, it's easy to get confused. ...