Mercury - Engine Starter Yamaha PWC & Sportboats Marine-Ready 8M6007431. Overview. If you ride personal watercraft or run Yamaha sport boats, you already know how much your day depends on that first push of the starter. It sets the tone-whether you're gearing up for a calm sunrise ride across glassy water or firing up for a full day of towing friends through wakes and chop. The Quicksilver 8M6007431 Engine Starter is built for those moments when you want your engine to leap to life without hesit