Sierra 18-7075

Restore Smooth Idling and Power with Precision Rebuild Components

Revitalize your Mercury outboard's fuel delivery system using this meticulously crafted carburetor rebuild kit. Designed as a direct-fit solution, it tackles common issues like rough idling, hesitation during acceleration, and poor fuel economy that plague aging carbs. Whether you're prepping for a weekend on the water or tackling offseason maintenance, these high-quality parts ensure your engine runs cleaner and more efficiently.

Crafted from durable materials resistant to ethanol-blended fuels, the kit addresses the wear from modern gasoline mixes that degrade standard diaphragms and gaskets. Expect tighter seals, responsive throttle response, and a noticeable boost in overall performance after installation.

Perfect Fit for Classic Mercury Engines

This kit aligns seamlessly with a range of Mercury two-stroke outboards from the late '80s and early '90s, including popular 65HP, 90HP, and similar configurations. It's engineered to match original specifications, making it a go-to for boaters restoring vintage powerheads or refreshing high-hour motors. Verify your carb model markings to confirm compatibility, as it supports multiple Mercury variants without modifications.

• Targets carbs prone to varnish buildup and float issues
• Ideal for saltwater environments where corrosion accelerates wear
• Supports engines in both standard and power trim setups

Kit Contents: Everything Needed for a Complete Overhaul

Unlike basic gasket sets, this comprehensive kit packs all essentials for a thorough rebuild:

• Precision needle and seat assemblies for accurate fuel metering
• Fuel-resistant diaphragms that flex reliably over thousands of cycles
• Assortment of gaskets and O-rings for leak-free assembly
• Screen filters to prevent debris ingress
• Idle and main jets optimized for stock tuning

Each component undergoes rigorous quality checks, ensuring longevity comparable to factory parts while standing up to the rigors of marine use.

Step-by-Step Installation Guide for DIY Success

Rebuilding your carb doesn't require a marine mechanic's expertise. With basic tools like screwdrivers, pliers, and carb cleaner, you can complete the job in under two hours per carb. Here's a proven approach:

1. Prep Work: Disconnect fuel lines, throttle linkages, and choke cables. Drain residual fuel and remove the carb from the intake manifold.
2. Disassembly: Soak in cleaner to dissolve varnish. Carefully note float orientation and spring tensions before separating bowls.
3. Inspection: Check for scored bores or warped mating surfaces—hone if needed, but replacement is rare with this kit.
4. Reassembly: Install new diaphragms with proper break-in flexing. Set float height to spec using the included tabs.
5. Testing: Bench-test for leaks, then reinstall. Prime and fire up—fine-tune idle mixture for crisp response.

Pro Tip: Label parts during teardown to avoid mix-ups on multi-carb setups. Always work in a well-ventilated area to handle cleaners safely.

Long-Term Maintenance to Maximize Engine Life

Pair this rebuild with smart habits to extend intervals between services. Run your motor with fuel stabilizer during storage to combat gum-up. Annually inspect for water intrusion via the vent line, and consider a fogging treatment for layups. Boaters report 3-5 years of trouble-free operation post-rebuild when flushing after every saltwater trip.

For high-performance tweaks, pair with a fuel filter upgrade and ensure your primer bulb holds pressure. This holistic approach keeps your Mercury humming reliably season after season.

Why Boaters Trust This Aftermarket Solution

Backed by decades of marine engineering expertise, Sierra parts deliver OEM-level performance at a fraction of dealer costs. Independent tests show these kits restore factory jetting accuracy, reducing emissions and improving cold starts. Joined by thousands of satisfied owners on forums and docks, it's the smart choice for keeping classic Mercs alive without breaking the bank.