Mercury Quicksilver - Outboard Service Kit EFI Maintenance Essentials OEM Components 8M0172123. Overview. There's something grounding about owning a small EFI outboard-you learn every sound it makes, every little quirk, and you know exactly when it's running at its best. The Quicksilver 8M0172123 Outboard Service Kit is built for that kind of boater. It keeps your Mercury 15-20 horsepower EFI engine in the sweet spot, where each start feels confident and every hour on the water feels effortless.