Mercury - Quicksilver Engine Starter Offset Gear Reduction 12-Volt 8M6007301. Overview. There's a certain confidence that comes from turning a key and knowing the engine you rely on-whether it's pushing a workboat, powering an industrial rig, or moving a piece of heavy equipment-is going to fire without hesitation. That steady, dependable start becomes part of your rhythm, especially when your days begin before sunrise or run long after most folks have called it quits. The Quicksilver 8M6007301