Sierra 18-7618-1 Carb-Reman - NLA Mc#1347-8289A 1

Why Choose a Remanufactured Marine Carburetor for Your Outboard Engine?

Boat owners know the frustration of a finicky carburetor—bogging down at idle, hesitation under load, or black smoke belching from the exhaust. A reliable carburetor is the heartbeat of your outboard's fuel delivery system, ensuring smooth power from dock to horizon. This Sierra remanufactured unit stands out by reviving high-quality cores to meet original equipment standards, delivering performance that rivals factory-fresh parts without the premium price tag.

Imagine pulling away from the launch with crisp throttle response and no tuning headaches. That's the promise here: each carburetor undergoes rigorous flow testing on specialized benches to mimic real-world marine conditions. Airflow, fuel metering, and vacuum signals are all verified, so it bolts on and performs right away. No guesswork, just dependable operation backed by a brand trusted by mechanics and weekend warriors alike.

Precision Rebuilt for Mercury Outboards

Engineered as a direct-fit replacement for Mercury 4-cylinder models in the 90-120 HP range (cross-referenced to OEM 1347-8289A1), this carburetor restores factory tolerances. Viton seals resist ethanol-blended fuels, needle and seat assemblies are refreshed for leak-free operation, and accelerator pumps deliver instant response. It's not just cleaned—it's disassembled, inspected, and rebuilt with upgraded components where wear patterns demand it.

Pro tip from the field: Ethanol in modern gas gums up small passages fast. This unit's design counters that with smoother idle circuits and larger jets if needed, keeping your engine purring through long trolling sessions or high-speed runs.

Effortless Installation and Long-Term Reliability

Bolting this in is straightforward for anyone who's swapped spark plugs. Disconnect fuel lines, throttle linkages, and choke cables; remove the old unit (usually four bolts); transfer floats and bowls if customized; and reverse the process. Use new gaskets—always—to prevent vacuum leaks that cause lean conditions and overheating.

• Prep your boat: Drain the fuel system and inspect lines for cracks.
• Sync it up: After install, synchronize with other carbs on multi-carb setups using a manometer for even vacuum.
• Break it in: Run at varied RPMs for 30 minutes to seat everything.

Expect minimal adjustments—maybe a tweak to the idle mixture screw based on your prop load. Saltwater anglers love how it shrugs off corrosion thanks to protective coatings on throttle shafts.

Maintenance Secrets to Maximize Lifespan

Keep it humming with annual flushes using a quality carb cleaner like Sea Foam through the fuel tank. Avoid running dry—residual fuel evaporates, leaving varnish behind. For storage, fog the bores and plug the vents. Common pitfalls? Overtightening floats or ignoring air filter restrictions, which starve it and spike temps.

Real-world edge: Compared to rebuilt generics, Sierra's flow bench data ensures balanced cylinders, preventing one-out lean spots that fry pistons. It's why pros swap these during repowers.

Real Boater Benefits: Performance, Peace of Mind

Picture this: You're 20 miles offshore when the engine stumbles. With this carb, that's history. It delivers consistent metering across RPMs, better fuel economy on cruises, and quicker plane-up times. Environmentally, precise atomization cuts unburnt hydrocarbons, keeping bays cleaner. It's the smart upgrade for reliability without rebuilding yourself—saving hours in the garage.