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3F0-87122-1 Carburetor Repair Seal Kit Fits Nissan / Tohatsu NS 2.5A2, NS 3.5A2

$22.50

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Send us the product link, your engine brand, full model and serial number, and the reference on your original part. Include the year if known.

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Product Overview

XR MARINE · CARBURETORS & REPAIR KITS

3F0-87122-1 Carburetor Repair Seal Kit Fits Nissan / Tohatsu NS 2.5A2, NS 3.5A2

This is a carburetor repair seal kit for servicing the carburetor on the listed Nissan and Tohatsu 2.5 HP and 3.5 HP 2-stroke outboards, as well as the listed Mercury and Mariner 2.5 HP and 3.5 HP 2-stroke outboard applications. It is intended for localized seal servicing and carburetor maintenance rather than replacing a complete carburetor assembly.

Before ordering, check the full engine model designation, including any NS or M prefix and A2, B, or B2 suffix, and match the complete carburetor repair-kit part number with its revision or M suffix.

Free shipping on all orders. Lifetime warranty for product quality defects. Normal wear and tear excluded.

Product Specifications

Key product details for identification and comparison.

Product Type Carburetor Repair Seal Kit
Brand XR Marine
Primary Reference Numbers 3F0-87122-0, 3F0-87122-1, 3F0-87122-2, 3F0871220M, 3F0871221M, 3F0871222M, 41859M, 92520M
Engine Stroke 2-Stroke
Listed Engine Models Nissan / Tohatsu NS 2.5A2, NS 3.5A2, NS 3.5B, NS 3.5B2, M 2.5A2, M 3.5A2, M 3.5B, M 3.5B2; Mercury / Mariner 2.5 HP & 3.5 HP 2-Stroke outboard applications
Service Purpose Carburetor repair and seal servicing for the listed outboard applications (not a complete carburetor assembly)

Fitment

The 3F0-87122-1 Carburetor Repair Seal Kit from XR Marine fits Nissan / Tohatsu NS 2.5A2 and M 2.5A2 (2.5 HP), NS 3.5A2, NS 3.5B, NS 3.5B2, M 3.5A2, M 3.5B, and M 3.5B2 (3.5 HP) 2-stroke outboards, as well as Mercury and Mariner 2.5 HP and 3.5 HP 2-stroke outboard applications in the entries listed below.

Match the full engine model designation on your identification plate—including the NS or M prefix and the A2, B, or B2 suffix—against the individual entries below, and compare the complete OEM service part number with its suffix. Horsepower alone cannot confirm fitment.

  • Brand: Nissan / Tohatsu Marine Outboard | Model: NS 2.5A2 | Power: 2.5 HP | Stroke: 2-Stroke | Engine Type: Outboard | Note: Confirm the carburetor service part number before purchase.
    ✓ Fits
  • Brand: Nissan / Tohatsu Marine Outboard | Model: NS 3.5A2 | Power: 3.5 HP | Stroke: 2-Stroke | Engine Type: Outboard | Note: Confirm the carburetor service part number before purchase.
    ✓ Fits
  • Brand: Nissan / Tohatsu Marine Outboard | Model: NS 3.5B | Power: 3.5 HP | Stroke: 2-Stroke | Engine Type: Outboard | Note: Confirm the carburetor service part number before purchase.
    ✓ Fits
  • Brand: Nissan / Tohatsu Marine Outboard | Model: NS 3.5B2 | Power: 3.5 HP | Stroke: 2-Stroke | Engine Type: Outboard | Note: Confirm the carburetor service part number before purchase.
    ✓ Fits
  • Brand: Nissan / Tohatsu Marine Outboard | Model: M 2.5A2 | Power: 2.5 HP | Stroke: 2-Stroke | Engine Type: Outboard | Note: Confirm the carburetor service part number before purchase.
    ✓ Fits
  • Brand: Nissan / Tohatsu Marine Outboard | Model: M 3.5A2 | Power: 3.5 HP | Stroke: 2-Stroke | Engine Type: Outboard | Note: Confirm the carburetor service part number before purchase.
    ✓ Fits
  • Brand: Nissan / Tohatsu Marine Outboard | Model: M 3.5B | Power: 3.5 HP | Stroke: 2-Stroke | Engine Type: Outboard | Note: Confirm the carburetor service part number before purchase.
    ✓ Fits
  • Brand: Nissan / Tohatsu Marine Outboard | Model: M 3.5B2 | Power: 3.5 HP | Stroke: 2-Stroke | Engine Type: Outboard | Note: Confirm the carburetor service part number before purchase.
    ✓ Fits
  • Brand: Mercury Mariner (Mercury) | Power: 2.5 HP | Stroke: 2-Stroke | Engine Type: Outboard | Note: Exact model, year and serial number not specified. Confirm the carburetor service part number before purchase.
    ✓ Fits
  • Brand: Mercury Mariner (Mercury) | Power: 3.5 HP | Stroke: 2-Stroke | Engine Type: Outboard | Note: Exact model, year and serial number not specified. Confirm the carburetor service part number before purchase.
    ✓ Fits
  • Brand: Mercury Mariner (Mariner) | Power: 2.5 HP | Stroke: 2-Stroke | Engine Type: Outboard | Note: Exact model, year and serial number not specified. Confirm the carburetor service part number before purchase.
    ✓ Fits
  • Brand: Mercury Mariner (Mariner) | Power: 3.5 HP | Stroke: 2-Stroke | Engine Type: Outboard | Note: Exact model, year and serial number not specified. Confirm the carburetor service part number before purchase.
    ✓ Fits

OEM & Part Number References

Use the complete reference number, including its suffix, when comparing parts. Reference numbers do not confirm that every version is interchangeable.

Brand / Source Reference Number
Nissan / Tohatsu Marine Outboard 3F0-87122-0, 3F0-87122-1, 3F0-87122-2, 3F0871220M, 3F0871221M, 3F0871222M, 3F0-W0093-00, 369871221M
Mercury Mariner 41859M, 92520M, 11502M
Yamaha Outboard (Reference) 6A1-W0093-01-00, 6G1-W0093-00-00
Sierra (Reference) 18-7765, 18-7293
RECMAR (Reference) REC6A1-W0093-01, REC6G1-W0093-00
Additional Reference (Brand Unspecified) 3F0-87122-1/2

Installation Guide

General installation overview. Follow the service manual for your exact engine and carburetor configuration. Fuel-system work requires the appropriate skills and precautions.

  1. Preparation and Part Comparison: Ensure the engine is shut off and cool, isolate the fuel supply and ignition according to your service manual, and work in a well-ventilated area away from ignition sources. Before disassembly, verify your engine model plate and compare the supplied seal kit parts against your existing carburetor components.
  2. Disassembly and Seal Replacement: Note the routing of fuel lines and linkage orientations before removing the carburetor. Disassemble the necessary carburetor sections per the factory manual, clean the sealing surfaces carefully, and replace only the seals and components that are supplied in the kit and match your carburetor configuration.
  3. Reassembly and Leak Inspection: Reassemble the carburetor and reinstall it following the service manual procedures and adjustments. Restore the fuel supply and inspect thoroughly for any fuel leaks or linkage binding before testing the engine with an appropriate cooling water supply. Stop immediately if any leak or abnormal operation is observed.

Before You Order

A careful fitment check helps you choose the right part the first time.

  • Match the full engine model designation on the identification plate.
  • Verify your exact model configuration and any serial-number or version details against your engine parts catalog.
  • Compare the complete OEM reference number, including its suffix. Horsepower or appearance alone is not enough.
  • Confirm the package contents and the quantity needed for your repair.
  • For Nissan and Tohatsu outboards, verify the exact NS or M prefix and the A2, B, or B2 suffix; for Mercury and Mariner applications, match the complete service part number including the M suffix.

Need help checking fitment? Have your engine identification details, the existing part number and clear photos ready when you contact XR Marine.

Ask XR Marine About Fitment

Why XR Marine

Carburetors are our focus. Fitment comes first.

XR Marine specializes in marine carburetors, carburetor repair kits and the related parts needed for these repairs. We keep our focus on this product line so that product information stays centered on the details that matter: engine applications, complete part-number references and what is included.

Use our individual fitment entries and part references to compare your application, then contact XR Marine if you need help before ordering.

Shipping

Free shipping on all orders. No minimum order value.

For questions about delivery to your destination or delivery timing, contact XR Marine before placing your order.

Contact XR Marine About Shipping

Lifetime Warranty

XR Marine provides lifetime warranty coverage for product quality defects. Normal wear and tear is excluded.

  • Covered: product quality defects.
  • Not covered: normal wear and tear.

Contact XR Marine for warranty assistance. Having your order details and a description of the issue available can help us understand your request.

Contact XR Marine About Warranty

Frequently Asked Questions

Answers to common questions about this product and its application.

Is this product a complete replacement carburetor or a repair seal kit?

This product is a carburetor repair seal kit intended for carburetor repair and seal servicing on the listed 2-stroke outboard applications. It is not a complete replacement carburetor assembly.

How do I confirm fitment for my Nissan or Tohatsu 2.5 HP or 3.5 HP outboard?

Check the engine identification plate for the full model code, including the NS or M prefix and the exact suffix (A2, B, or B2). Then compare your engine's required service part number against the listed reference numbers such as 3F0-87122-0, 3F0-87122-1, 3F0-87122-2, or their M-suffix counterparts.

Can I order this kit for a Mercury or Mariner 2.5 HP or 3.5 HP 2-stroke outboard by horsepower alone?

No. Exact model, year, and serial number details are not specified in the general Mercury and Mariner 2.5 HP and 3.5 HP 2-stroke entries, so you must verify that your engine requires one of the listed service part numbers (such as 41859M, 92520M, or 11502M, including the M suffix) before ordering.

Why are Yamaha, Sierra, and RECMAR part numbers listed in the reference table?

Numbers such as 6A1-W0093-01-00, 6G1-W0093-00-00, 18-7765, 18-7293, REC6A1-W0093-01, and REC6G1-W0093-00 are provided as part-number cross-references from the product records. Reference numbers do not confirm that every version is interchangeable, so always match both your engine application and complete part number.

How can I check the exact components included in the package before purchasing?

Detailed component quantities are not itemized on this page. Please contact XR Marine before ordering if you need to confirm the exact supplied contents for your repair.

What shipping and warranty policies apply to this carburetor repair seal kit?

All XR Marine orders include free shipping with no minimum order value. This kit is also backed by our lifetime warranty covering product quality defects, with normal wear and tear excluded.

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