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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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Product Overview

XR MARINE · CARBURETORS & REPAIR KITS

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

This carburetor repair seal kit is designed for servicing and resealing the carburetor on listed Nissan and Tohatsu 2.5 HP and 3.5 HP 2-stroke outboards, as well as listed Mercury and Mariner 2.5 HP and 3.5 HP 2-stroke outboard applications. It is a repair and seal service kit for targeted maintenance rather than a complete replacement carburetor assembly. Before ordering, verify the complete engine model designation (including the NS or M prefix and the A2, B, or B2 suffix where applicable) and match the exact carburetor service part number.

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 OEM References 3F0-87122-0, 3F0-87122-1, 3F0-87122-2, 3F0871220M, 3F0871221M, 3F0871222M, 41859M, 92520M
Target Engine Brands Nissan / Tohatsu Marine Outboard; Mercury / Mariner
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
Engine Stroke & Horsepower 2-Stroke (2.5 HP, 3.5 HP)
Application Purpose Carburetor repair and seal servicing for the listed outboard applications

Fitment

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

Verify the complete engine model on your identification plate—including the NS or M prefix and the A2, B, or B2 suffix for Nissan and Tohatsu engines—and compare your complete OEM carburetor repair-kit part number (including any revision digit or M suffix) before ordering. Horsepower alone cannot confirm compatibility.

  • Brand: Nissan / Tohatsu Marine Outboard | Model: NS 2.5A2 | Power: 2.5 HP | Stroke: 2-Stroke | Note: Nissan NS 2.5A2, 2.5 HP, 2-Stroke.
    ✓ Fits
  • Brand: Nissan / Tohatsu Marine Outboard | Model: NS 3.5A2 | Power: 3.5 HP | Stroke: 2-Stroke | Note: Nissan NS 3.5A2, 3.5 HP, 2-Stroke.
    ✓ Fits
  • Brand: Nissan / Tohatsu Marine Outboard | Model: NS 3.5B | Power: 3.5 HP | Stroke: 2-Stroke | Note: Nissan NS 3.5B, 3.5 HP, 2-Stroke.
    ✓ Fits
  • Brand: Nissan / Tohatsu Marine Outboard | Model: NS 3.5B2 | Power: 3.5 HP | Stroke: 2-Stroke | Note: Nissan NS 3.5B2, 3.5 HP, 2-Stroke.
    ✓ Fits
  • Brand: Nissan / Tohatsu Marine Outboard | Model: M 2.5A2 | Power: 2.5 HP | Stroke: 2-Stroke | Note: Tohatsu M 2.5A2, 2.5 HP, 2-Stroke.
    ✓ Fits
  • Brand: Nissan / Tohatsu Marine Outboard | Model: M 3.5A2 | Power: 3.5 HP | Stroke: 2-Stroke | Note: Tohatsu M 3.5A2, 3.5 HP, 2-Stroke.
    ✓ Fits
  • Brand: Nissan / Tohatsu Marine Outboard | Model: M 3.5B | Power: 3.5 HP | Stroke: 2-Stroke | Note: Tohatsu M 3.5B, 3.5 HP, 2-Stroke.
    ✓ Fits
  • Brand: Nissan / Tohatsu Marine Outboard | Model: M 3.5B2 | Power: 3.5 HP | Stroke: 2-Stroke | Note: Tohatsu M 3.5B2, 3.5 HP, 2-Stroke.
    ✓ Fits
  • Brand: Mercury Mariner | Power: 2.5 HP | Stroke: 2-Stroke | Note: Mercury, model not specified, 2.5 HP, 2-Stroke.
    ✓ Fits
  • Brand: Mercury Mariner | Power: 3.5 HP | Stroke: 2-Stroke | Note: Mercury, model not specified, 3.5 HP, 2-Stroke.
    ✓ Fits
  • Brand: Mercury Mariner | Power: 2.5 HP | Stroke: 2-Stroke | Note: Mariner, model not specified, 2.5 HP, 2-Stroke.
    ✓ Fits
  • Brand: Mercury Mariner | Power: 3.5 HP | Stroke: 2-Stroke | Note: Mariner, model not specified, 3.5 HP, 2-Stroke.
    ✓ Fits
  • Brand: Nissan / Tohatsu Marine Outboard | Model: NS 2.5A2 | Power: 2.5 HP | Stroke: 2-Stroke | Restriction: engine_type: Outboard | Note: Nissan NS 2.5A2, 2.5 HP, 2-Stroke outboard; year and serial number not specified. Confirm the carburetor service part number before purchase.
    ! Check conditions
  • Brand: Nissan / Tohatsu Marine Outboard | Model: NS 3.5A2 | Power: 3.5 HP | Stroke: 2-Stroke | Restriction: engine_type: Outboard | Note: Nissan NS 3.5A2, 3.5 HP, 2-Stroke outboard; year and serial number not specified. Confirm the carburetor service part number before purchase.
    ! Check conditions
  • Brand: Nissan / Tohatsu Marine Outboard | Model: NS 3.5B | Power: 3.5 HP | Stroke: 2-Stroke | Restriction: engine_type: Outboard | Note: Nissan NS 3.5B, 3.5 HP, 2-Stroke outboard; year and serial number not specified. Confirm the carburetor service part number before purchase.
    ! Check conditions
  • Brand: Nissan / Tohatsu Marine Outboard | Model: NS 3.5B2 | Power: 3.5 HP | Stroke: 2-Stroke | Restriction: engine_type: Outboard | Note: Nissan NS 3.5B2, 3.5 HP, 2-Stroke outboard; year and serial number not specified. Confirm the carburetor service part number before purchase.
    ! Check conditions
  • Brand: Nissan / Tohatsu Marine Outboard | Model: M 2.5A2 | Power: 2.5 HP | Stroke: 2-Stroke | Restriction: engine_type: Outboard | Note: Tohatsu M 2.5A2, 2.5 HP, 2-Stroke outboard; year and serial number not specified. Confirm the carburetor service part number before purchase.
    ! Check conditions
  • Brand: Nissan / Tohatsu Marine Outboard | Model: M 3.5A2 | Power: 3.5 HP | Stroke: 2-Stroke | Restriction: engine_type: Outboard | Note: Tohatsu M 3.5A2, 3.5 HP, 2-Stroke outboard; year and serial number not specified. Confirm the carburetor service part number before purchase.
    ! Check conditions
  • Brand: Nissan / Tohatsu Marine Outboard | Model: M 3.5B | Power: 3.5 HP | Stroke: 2-Stroke | Restriction: engine_type: Outboard | Note: Tohatsu M 3.5B, 3.5 HP, 2-Stroke outboard; year and serial number not specified. Confirm the carburetor service part number before purchase.
    ! Check conditions
  • Brand: Nissan / Tohatsu Marine Outboard | Model: M 3.5B2 | Power: 3.5 HP | Stroke: 2-Stroke | Restriction: engine_type: Outboard | Note: Tohatsu M 3.5B2, 3.5 HP, 2-Stroke outboard; year and serial number not specified. Confirm the carburetor service part number before purchase.
    ! Check conditions
  • Brand: Mercury Mariner | Power: 2.5 HP | Stroke: 2-Stroke | Restriction: engine_type: Outboard | Note: Mercury 2.5 HP, 2-Stroke outboard application; exact model, year and serial number not specified. Confirm the carburetor service part number before purchase.
    ! Check conditions
  • Brand: Mercury Mariner | Power: 3.5 HP | Stroke: 2-Stroke | Restriction: engine_type: Outboard | Note: Mercury 3.5 HP, 2-Stroke outboard application; exact model, year and serial number not specified. Confirm the carburetor service part number before purchase.
    ! Check conditions
  • Brand: Mercury Mariner | Power: 2.5 HP | Stroke: 2-Stroke | Restriction: engine_type: Outboard | Note: Mariner 2.5 HP, 2-Stroke outboard application; exact model, year and serial number not specified. Confirm the carburetor service part number before purchase.
    ! Check conditions
  • Brand: Mercury Mariner | Power: 3.5 HP | Stroke: 2-Stroke | Restriction: engine_type: Outboard | Note: Mariner 3.5 HP, 2-Stroke outboard application; exact model, year and serial number not specified. Confirm the carburetor service part number before purchase.
    ! Check conditions

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 6A1-W0093-01-00, 6G1-W0093-00-00
Sierra 18-7765, 18-7293
RECMAR REC6A1-W0093-01, REC6G1-W0093-00
Unbranded / General Reference 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. Verify identification and prepare the workspace: Confirm the engine model designation on the identification plate and match your carburetor service part number against the supplied kit. Shut off the engine, allow it to cool completely, isolate the fuel supply and ignition system as directed in your service manual, and work in a well-ventilated area away from open flames or sparks.
  2. Disassemble and compare seal components: Document fuel-line routing and linkage positions before removing the carburetor. Disassemble the carburetor sections according to your factory service manual, clean all mating surfaces carefully, and compare each removed seal or gasket side-by-side with the supplied kit pieces to ensure an exact match. Replace only the components provided in the kit that match your specific carburetor version.
  3. Reassemble and check for fuel leaks: Reassemble the carburetor and reinstall it on the outboard following the procedures and specifications in your service manual. Restore the fuel supply and inspect all sealing surfaces and connections for any signs of fuel leakage before starting. Only perform a test run with proper cooling water supplied to the engine, and shut the engine down immediately if any leak, binding linkage, or abnormal operation occurs.

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 the specific model suffix (such as A2, B, or B2 on Nissan and Tohatsu models) and any engine configuration requirements in the fitment list.
  • 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 Mercury and Mariner 2.5 HP and 3.5 HP 2-stroke applications where a specific engine model code is not listed, verify fitment directly by matching the complete service part number (such as 41859M or 92520M, 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 for servicing and resealing an existing carburetor on the listed outboard applications. It is not a complete replacement carburetor assembly.

Which Nissan and Tohatsu outboard models are covered by this kit?

This kit fits the listed 2-stroke Nissan models NS 2.5A2 (2.5 HP), NS 3.5A2 (3.5 HP), NS 3.5B (3.5 HP), and NS 3.5B2 (3.5 HP), as well as Tohatsu models M 2.5A2 (2.5 HP), M 3.5A2 (3.5 HP), M 3.5B (3.5 HP), and M 3.5B2 (3.5 HP). Always confirm both the full model designation and your required carburetor service part number before purchasing.

How do I verify compatibility for a Mercury or Mariner 2.5 HP or 3.5 HP 2-stroke outboard?

Because exact model codes, years, and serial numbers are not specified in the Mercury and Mariner fitment records, you must verify compatibility by matching the complete carburetor service part number from your parts catalog (such as 41859M, 92520M, or 11502M, including the M suffix) before ordering.

Why do the part number suffixes and model letters matter when selecting this kit?

Different 2.5 HP and 3.5 HP outboards may use different carburetor revisions. Matching the NS or M prefix and the A2, B, or B2 model suffix on Nissan/Tohatsu engines—along with the exact revision number or M suffix on the part number (such as 3F0-87122-0, 3F0-87122-1, 3F0-87122-2, or 41859M)—helps ensure you select the correct kit for your specific carburetor.

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

Detailed component breakdown and piece counts are not listed on this page. Please contact XR Marine before ordering if you need to confirm the exact seals and components supplied in the package for your repair.

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

XR Marine offers free shipping on all orders with no minimum order value, and provides a lifetime warranty covering product quality defects (normal wear and tear is excluded).

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