Mercury - Starter Motor Assembly MerCruiser Inline Series Marine-Grade Housing 8M0090697. Overview. There's nothing quite like the moment your engine fires to life on the first turn of the key. It's a small burst of confidence that sets the tone for the entire day on the water. When your starter is reliable, you don't think about it - you just enjoy the sound of your MerCruiser waking up with that familiar, steady rhythm. The Mercury 8M0090697 Starter Motor Assembly delivers that feeling every t