Sierra 118-9251 Outboard Maintenance Kit Mercury 75 90 115 HP Optimax 2-Stroke

The Sierra 118-9251 is a comprehensive, all-in-one outboard maintenance kit engineered for Mercury 75, 90, and 115 HP Optimax 1.5L 2-Stroke outboard engines with serial numbers 1B227000 and up. Designed to simplify routine service, this kit delivers everything needed to keep your Mercury Optimax running at peak performance — all in a single, convenient package.

Sierra Outboard Engine Maintenance Kits provide a one-box solution for scheduled service intervals, replacing the need to source individual components separately. Each kit is packaged in a premium full-color Sierra branded box with clear labeling of all included components.

Kit Includes:

• High-quality spark plugs — pre-gapped and ready for installation
• Water pump kit — specifically engineered for this engine model
• Thermostat — model-specific fit
• Fuel filter — designed for Mercury Optimax 2-Stroke engines

Key Features:

• Fits Mercury 75, 90, and 115 HP Optimax 1.5L 2-Stroke outboards (S/N 1B227000 and up)
• All components are model-specific — no guesswork on fitment
• Significant cost savings compared to purchasing parts individually
• Sierra aftermarket parts meet or exceed OEM standards
• Saves time by consolidating all routine service parts into one kit

The Sierra 118-9251 maintenance kit is the smart choice for boaters and technicians looking to streamline scheduled service on Mercury Optimax outboards. Sierra has a decades-long history as a trusted manufacturer of aftermarket marine engine parts, and this kit reflects that commitment to quality and reliability.