JLM MARINE Carburetor Rebuild Kit for Johnson Evinrude OMC 18–75 HP — Full Gasket & Diaphragm Set

The JLM MARINE 396701 carburetor rebuild kit supplies all the gaskets, seals, and replacement parts needed to restore Johnson, Evinrude and OMC carburetors on 18–75 HP outboards.

If your outboard engine shows rough idling, hard starting, or reduced throttle response, the carburetor is often the culprit. This rebuild kit is made to match the factory fittings for many Johnson, Evinrude and OMC models (part numbers listed below) and includes the small components that commonly fail with age, ethanol exposure, or debris. Rebuilding the carburetor can bring back consistent fuel flow and better performance without replacing the entire carburetor body.

Which engines and part numbers does this kit fit?

This JLM MARINE kit is designed to be compatible with a broad range of Johnson, Evinrude and OMC carburetors used on 18–75 HP outboards. It matches original part numbers and common aftermarket references so you can confirm fitment before buying.

• Compatible OEM references: 396701, 398729, 777717, 392061 and others listed on the product page.
• Also replaces Sierra 18-7042 and 18-7222, Mallory 9-37105 / 9-37107, and REC396701 / 47-7042.
• Engine horsepower coverage: 18, 20, 25, 28, 30, 35, 40, 45, 48, 50, 55, 60, 65, 70, 75 HP.

What parts are included and what problems do they solve?

The kit bundles the gaskets, diaphragms, needles, and seals that wear out or become brittle over time. Replacing these parts addresses common symptoms such as flooding, lean running, poor acceleration, and fuel leaks.

• Complete gasket sets to restore airtight seals between carburetor sections.
• Diaphragms and metering parts that renew fuel delivery control.
• Needles, seats and small hardware to stop drips and restore proper float operation.

How difficult is installation and what tools are required?

Installation is a moderate DIY task for someone comfortable with small engine repair and basic shop tools. Clean workspace, carburetor cleaner, and a small set of screwdrivers, pliers and wrenches are usually sufficient; a repair manual or exploded diagram helps ensure correct part placement.

• Recommended tools: screwdriver set, small pliers, carb cleaner, safety gloves, and a clean bench.
• Allow time: plan for careful disassembly, parts cleaning, and correct gasket seating to avoid leaks.
• Referencing the engine service manual or diagram reduces assembly errors and ensures tuning afterward.

What performance improvements can I expect after rebuilding?

Rebuilding the carburetor restores the intended fuel/air metering so the engine starts more reliably and runs more smoothly across RPM ranges. While this kit won’t upgrade power, it returns the carburetor to designed operating condition and can reduce fuel surging, stalling, and rough idle.

• Smoother idle and steadier response to throttle input.
• Reduced fuel leaks and fewer flooding or hard-start episodes.
• Better overall fuel metering leading to consistent performance under load.

Who is this for: This rebuild kit is aimed at boat owners, marine mechanics and DIY enthusiasts who maintain Johnson, Evinrude or OMC outboards from 18 to 75 HP. It’s especially useful if the carburetor shows age-related wear, if the engine has sat idle for a long time, or if you prefer repairing worn components rather than replacing the entire carburetor assembly. Confirm your engine part numbers against the compatibility list to ensure the correct fit before purchase.