Mercury - Outboard Service Kit 4-6HP Carbureted Series OEM Components 8M0181315. Overview. Every small outboard has a story-quiet mornings on glassy water, afternoons spent trolling along a shoreline, or the simple satisfaction of knowing your engine will start on the very first pull. That kind of confidence does not just happen; it grows from proper care. The Mercury 8M0181315 Outboard Service Kit gives you everything you need to keep your 4-6 horsepower engine steady, smooth and trustworthy. W