Description
Mercury 300-Hour Maintenance Kit 40–60HP EFI CT/BigFoot (8M0090559)
Service your Mercury 4-cylinder 40–60HP FourStroke EFI outboard the right way with this genuine 300-hour kit. It bundles factory-specified parts for BigFoot and Command Thrust gearcases so you can complete a full interval service with confidence, using common shop tools and OEM-correct components.
Applications
- Mercury FourStroke EFI 40–60HP, 4-cylinder
- BigFoot and Command Thrust (CT) gearcases only
- Serial number 1C000001 and higher
- Always confirm by model and serial number in your owner’s/service manual
Shipping & Returns
Fast shipping from Wisconsin with reliable carriers. Need help verifying fit by serial number? We’re happy to assist. Returns are easy—see our Return Policy.
Key Facts
- Brand: Mercury Precision
- Part #: 8M0090559
- Service Interval: 300 hours (or annually—whichever comes first, per manual)
- Fits: 40–60HP EFI FourStroke, 4-cyl, BigFoot/CT gearcases (SN 1C000001+)
- UPC: 745061933668
- Store Category: Parts > Maintenance Kits
- Benefits: OEM correct fit, complete parts in one box, simplified maintenance
What’s Included
- Oil filter
- Low-pressure fuel filter
- High-pressure fuel filter
- Oil drain seal
- Gearcase seals
- Thermostat and thermostat gaskets
- Water pump impeller kit
- Four (4) spark plugs
- Power-trim anode
- Lower-unit anode
Service Notes
- For BigFoot/CT gearcases only; this kit is not for standard gearcase models
- Follow Mercury service manual procedures and torque specifications
- Inspect anodes and cooling passages; replace any heavily worn components
- Use Mercury/Quicksilver-spec lubricants and sealants where specified
- California Prop 65: Cancer and Reproductive Harm