Nxoizam Carburetor Rebuild Kit for Mercruiser 2‑Barrel (3.0L–5.7L) — Full Gasket, Needle & Float Set

The Nxoizam Carburetor Rebuild Kit renews worn Mercruiser 2-barrel carburetors (3.0L, 4.3L, 5.0L, 5.7L) with a complete set of gaskets, needles, seats and a replacement float so your engine runs smoother and more reliably.

Whether restoring an older Mercury/Rochester 2-barrel carburetor or refreshing performance on a Mercruiser outboard, this all-in-one rebuild kit collects the common wear parts you need to bring a carburated induction system back to spec. The components are designed to match part numbers used across many Mercruiser and Mercury Marine applications; confirm compatibility against your carburetor number before installing. The kit aims to replace deteriorated seals, small hardware and the float that most often cause poor idle, leaks and fuel-level issues.

What parts are included and how complete is the kit?

This kit bundles the typical consumables required for a full rebuild of a 2-barrel Rochester-type carburetor: gaskets, O-rings, needle and seat assemblies, jets, small springs and a replacement float. It does not include large cast parts like the carburetor body or throttle plates.

• Full set of gaskets and seals for float bowl and metering areas
• Needle & seat assemblies to control fuel flow into the bowl
• Main and idle jets plus small springs and clip hardware
• Replacement float matched to common Mercruiser 2-barrel models

Which Mercruiser and Mercury engines will this fit?

The kit targets a range of Mercury/Rochester 2-barrel carburetors used on Mercruiser 3.0L, 4.3L, 5.0L and 5.7L engines and several GM-sourced marine engine applications. Part numbers listed with the kit (examples: 1389-9670A2, 3310-807312A1) help you verify fitment; always match the carburetor number stamped on your unit before ordering.

• Compatible with many Mercruiser 2-barrel Rochester carbs (3.0L–5.7L)
• Useful for GM-based marine engines cited in manufacturer fit lists
• Not universal—confirm part number compatibility first

How difficult is installation and what tools are needed?

Installation is intended for boat owners or mechanics with basic mechanical skills and common hand tools. The process typically involves removing the carburetor, disassembling the body, cleaning surfaces, replacing kit parts, and reassembling with correct torque on fasteners.

• Basic hand tools: screwdrivers, socket set, pliers
• Carburetor cleaner and a clean work surface recommended
• Common tasks: replace float, reseat needles, swap gaskets
• Professional service recommended if unsure about jet calibration

Will this kit improve fuel efficiency or resolve leaks?

Replacing worn seals, needle seats and the float can restore proper fuel level and metering, often eliminating leaks and unstable idle. While results vary by engine condition and tuning, renewed sealing and correct float operation are practical first steps toward improved drivability.

• Stops fuel seepage caused by perished gaskets and seals
• Restores float-level control for consistent metering
• May reduce hesitation and rough idle caused by worn parts

Who is this for: The Nxoizam Carburetor Rebuild Kit is suited to boat owners, DIY marine mechanics and professional technicians working on Mercury/Rochester 2-barrel carburetors used in Mercruiser 3.0L–5.7L applications. If you have an older carburated Mercruiser engine showing fuel leaking, poor idle, or unreliable throttle response and you can match your carburetor part number to the kit listing, this set provides the common replacement parts to address those symptoms. For complex tuning or calibration beyond parts replacement, consult a marine service technician.