812648T Carburetor Fits Mercury Mariner (4 HP, 5 HP)

Product Overview

XR MARINE · CARBURETORS & REPAIR KITS

812648T Carburetor Fits Mercury Mariner (4 HP, 5 HP)

This product is a replacement carburetor for supported small 2-stroke outboard applications, not a carburetor repair kit. It is listed for Mercury and Mariner 4 HP and 5 HP 2-stroke engines within serial-number range 0P17000–0P400999, as well as supported Tohatsu and Nissan 5 HP 2-stroke applications where the exact model and carburetor version are matched.

Always match the complete original carburetor reference—including prefixes, hyphens, and suffixes—and verify your engine serial number and application details before ordering, as horsepower alone is not enough to identify the correct carburetor version.

Product Specifications

Key product details for identification and comparison.

Fitment

The 812648T Carburetor from XR Marine fits Mercury and Mariner 4 HP and 5 HP 2-stroke outboard engines (serial numbers 0P17000–0P400999), and fits Tohatsu and Nissan 5 HP 2-stroke outboard engines when the exact model and carburetor version are matched, in the applications listed below.

Verify the full engine identification details on your engine plate against the individual records below, compare the complete original carburetor reference number (including prefixes, hyphens, and suffixes), and observe the serial-number range 0P17000–0P400999 for Mercury and Mariner or the version-matching requirement for Tohatsu and Nissan. Horsepower alone is not enough to confirm compatibility.

• Brand: Mercury Mariner (Mercury) | Power: 4 HP | Stroke: 2-Stroke | Serial range: 0P17000–0P400999
  ✓ Fits
• Brand: Mercury Mariner (Mercury) | Power: 5 HP | Stroke: 2-Stroke | Serial range: 0P17000–0P400999
  ✓ Fits
• Brand: Mercury Mariner (Mariner) | Power: 4 HP | Stroke: 2-Stroke | Serial range: 0P17000–0P400999
  ✓ Fits
• Brand: Mercury Mariner (Mariner) | Power: 5 HP | Stroke: 2-Stroke | Serial range: 0P17000–0P400999
  ✓ Fits
• Brand: Nissan / Tohatsu Marine Outboard (Tohatsu) | Power: 5 HP | Stroke: 2-Stroke | Restriction: Exact model and carburetor version must be matched.
  ! Check conditions
• Brand: Nissan / Tohatsu Marine Outboard (Nissan) | Power: 5 HP | Stroke: 2-Stroke | Restriction: Exact model and carburetor version must be matched.
  ! 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.

Check the full original carburetor number, including prefixes, hyphens, and suffixes. Do not assume that 812648 and 812648T, or 9720 and 3303-9720, are interchangeable solely because the numbers are similar.

What's Included

Check the supplied components before planning your repair.

• Included Component: Carburetor (this listing is for a replacement carburetor, not a carburetor repair kit).

Contact XR Marine to confirm the supplied contents before ordering.

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 & Part Verification: Ensure the engine is shut off and cool, work in a well-ventilated area away from ignition sources, and isolate the fuel supply and ignition system according to your service manual. Before removing the existing unit, verify your engine serial number or model designation and compare the replacement carburetor's mounting flange, throttle and choke linkage points, and fuel inlet orientation against your original carburetor.
2. Removal & Carburetor Installation: Document or photograph the routing of all fuel lines and linkage connections before disassembly. Remove the old carburetor per the service manual, inspect the intake mounting surface and mating gasket (such as gasket references 369-02011-0 / 369020110M where applicable), and install the replacement carburetor following the manual's fastening sequence. Reconnect the fuel line and linkages, checking that the throttle and choke move smoothly through their full travel without binding.
3. Fuel Leak Inspection & Operational Check: Restore the fuel supply and carefully inspect all fuel fittings and sealing surfaces for any signs of fuel seepage before starting the engine. Only run the outboard with the proper cooling water supply connected, and follow your factory service manual for any required idle or mixture adjustments. Shut the engine down immediately if you observe fuel leaks, linkage sticking, or abnormal operation.

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.
• Check the individual fitment entry and any serial-number or version restrictions (such as serial range 0P17000–0P400999 for Mercury and Mariner 4 HP / 5 HP 2-stroke engines).
• 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.
• Do not assume that 812648 and 812648T, or 9720 and 3303-9720, are interchangeable solely because the numbers look similar.
• For Tohatsu and Nissan 5 HP 2-stroke outboards, verify both the exact engine model and the original carburetor version before ordering.

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

Why XR Marine

Frequently Asked Questions

Answers to common questions about this product and its application.