Yamaha Base Magneto - 6C5-85561-00-94. Reliable Power Generation with the Yamaha Base Magneto. The Yamaha Base Magneto - 6C5-85561-00-94 is an essential part for keeping your Yamaha engine running efficiently. This high-quality component is designed to provide the necessary electrical power for your boat's ignition system, ensuring smooth operation and reliable performance. Whether you're out on the water for a day of leisure or tackling more challenging waters, this base magneto helps maintain