Carburetor Repair Seal Kit for Tohatsu/Nissan/Mercury Mariner 2.5–3.5 HP 2-Stroke Outboards

Product Details

This carburetor repair seal kit is designed for select Tohatsu and Nissan 2-stroke outboard engines rated at 2.5 HP and 3.5 HP, as well as select Mercury Mariner 2-stroke 2.5 HP and 3.5 HP outboards. It is intended to renew the carburetor sealing components and help restore reliable sealing during carburetor service.

For Tohatsu and Nissan applications, the listed reference numbers are 3F0-87122-0, 3F0-87122-1, 3F0-87122-2, 3F0871220M, 3F0871221M, and 3F0871222M. For Mercury Mariner applications, the listed reference numbers are 41859M and 92520M. Confirm the exact engine model and reference number before ordering.

• Repair seal kit for small two-stroke outboard carburetors.
• Designed for the listed Tohatsu, Nissan, Mercury, and Mariner applications.
• Useful when servicing a carburetor with worn, damaged, or deteriorated sealing components.
• Suitable for installation by an experienced DIY mechanic or marine service professional.

Reference Number Matrix

Use the following manufacturer reference numbers to help confirm application compatibility. These numbers identify the listed application references and should be matched to your engine before purchase.

Engine & Model Compatibility

The confirmed application information identifies the following model families and engine conditions. Year, serial-number, shaft-length, and other production-range information was not provided, so verify the model designation and reference number against your engine before ordering.

Technical Specifications

Product Type

Carburetor Repair Seal Kit

Application

Small 2-stroke marine outboard carburetor service

Rated Engine Range

2.5 HP and 3.5 HP applications

Installation

DIY or professional installation

Fuel System

Gasoline outboard fuel systems

What’s in the Box

This product is a carburetor repair seal kit. The supplied package contents are the sealing components specified for the applicable carburetor service. Individual component types and quantities were not specified in the product record; compare the package and application with your original parts before installation.

Installation Notes

1. Shut off the fuel supply and work in a well-ventilated area away from ignition sources.
2. Disconnect the fuel line and carefully remove the carburetor, noting the position of all hoses, linkages, and fasteners.
3. Disassemble the carburetor on a clean work surface and retain reusable hardware in an organized manner.
4. Clean the reusable metal surfaces with an appropriate carburetor cleaner and allow them to dry fully.
5. Remove the old sealing components without scratching the mating surfaces.
6. Install the replacement seals in the correct locations and make sure each seal is seated properly.
7. Reassemble the carburetor according to the service instructions for the specific engine.
8. Reinstall the carburetor, reconnect all hoses and linkages, and check carefully for fuel leaks before starting the engine.

Troubleshooting & FAQ

Safety & Important Information

• Confirm the engine model, horsepower, stroke, and reference number before purchase.
• Do not install seals that are damaged, contaminated, or visibly different from the parts being replaced.
• Use appropriate ventilation and fire-safety precautions when working with gasoline-powered equipment.
• After installation, inspect for fuel leaks before starting and operating the outboard.
• Year, serial-number, shaft-length, package-quantity, weight, and warranty information was not specified for this product and is therefore not claimed here.

About Sea Sierra

• Marine Parts Focus — Practical replacement parts for outboard maintenance and repair.
• Application-Focused Listings — Product descriptions emphasize engine model, horsepower, stroke, and reference-number matching.
• Service-Ready Information — Clear installation and verification guidance helps you select the correct replacement part.