Sierra 18-7004

Restore the smooth performance of your Mercury outboard with the Sierra 18-7004 Mercarb gas rebuild kit, a reliable OEM-style replacement designed for hassle-free carburetor maintenance. Boat owners trust this kit to tackle common issues like rough idling, hesitation under load, or poor fuel efficiency caused by worn diaphragms and gaskets. Crafted with precision using high-quality materials, it delivers the durability you need for extended time on the water.

Essential Components for a Complete Rebuild

This comprehensive kit includes all the critical parts to refresh your Mercarb carburetor:

• High-grade diaphragms resistant to fuel degradation
• Precision needle and seat assemblies for optimal fuel flow
• Durable gaskets and O-rings for leak-free seals
• Screens and check valves to prevent clogs
• Float assemblies for consistent fuel levels

Unlike partial kits, the Sierra 18-7004 provides everything required for a thorough rebuild, minimizing downtime and ensuring your engine runs like new.

Perfect Fit for Mercury Outboards

Engineered as a direct replacement for Mercury part 1395-6200, this kit fits a wide range of inline and V6 Mercury outboards from the 1970s through the late 1980s. It's compatible with popular models featuring Mercarb carburetors, including 75HP to 225HP variants. Always cross-reference your engine's carburetor model to confirm fitment, but marine enthusiasts report seamless installation across multiple serial number ranges.

Why Choose Sierra for Your Carburetor Rebuild?

Sierra stands out in the marine aftermarket for its commitment to quality control and exact-match engineering. This kit resists ethanol-blended fuels better than stock parts, addressing a common modern challenge. Users praise its longevity, often lasting seasons without issues, and the straightforward design that suits both DIY mechanics and seasoned techs. Save on dealer costs while maintaining OEM-level performance.

Step-by-Step Installation Guide

Rebuilding your carburetor is a rewarding project that sharpens engine response. Here's a proven approach:

1. Safely disconnect the fuel line and remove the carburetor from the engine.
2. Disassemble carefully, noting part positions, and clean all components with carb cleaner.
3. Replace diaphragms, gaskets, needle valves, and floats using the new kit pieces.
4. Reassemble, ensuring proper diaphragm orientation to avoid binding.
5. Reinstall, prime the system, and test for leaks before full throttle runs.

Pro tip: Work in a well-ventilated area and wear safety gear. A rebuild typically takes 1-2 hours per carburetor.

Maintenance Tips to Maximize Lifespan

To keep your freshly rebuilt carburetor humming:

• Use fuel stabilizers during storage to combat varnish buildup.
• Run the engine weekly to circulate fuel through the system.
• Inspect linkages and jets seasonally for wear.
• Switch to ethanol-free gas when possible for superior protection.

Regular care like this extends the kit's effectiveness, preventing premature failures and costly overhauls.

Frequently Asked Questions