Carburetor Assembly for Tohatsu, Nissan and Mercury Mariner 15–20 HP 4-Stroke Outboards

Product Details

This carburetor assembly is designed for selected 15–20 HP, 4-stroke, twin-cylinder outboard applications from Tohatsu, Nissan Marine and Mercury Mariner. The company fitment information identifies Tohatsu models MFS20C, F15C, F20C, MFS15C and NSF15C, along with Mercury Mariner 15–20 HP 4-stroke 2-cylinder applications.

The company listing also notes a tiller-control configuration and indicates that the 15 HP application may increase output to 20 HP when used with the appropriate engine setup. Confirm the exact model, control style, original carburetor and applicable manufacturer part number before ordering.

• Complete replacement carburetor assembly
• For selected 15–20 HP, 4-stroke, 2-cylinder outboards
• Applications include Tohatsu, Nissan Marine and Mercury Mariner models listed below
• Designed for the corresponding original mounting, linkage and fuel-system configuration

Part Number Matrix

The following manufacturer and reference numbers are associated with this carburetor assembly. Number appearance alone does not replace confirmation of the complete engine application.

Engine & Model Compatibility

Keep horsepower, stroke, cylinder configuration and control style together when checking fitment. The applications below are based on the company product records; year and serial-number coverage was not provided for this product.

Technical Specs

Type

Carburetor Assembly

Application

Selected Tohatsu, Nissan Marine and Mercury Mariner outboard engines

HP Range

15 HP–20 HP

Stroke

4-Stroke

Cylinder Configuration

2-Cylinder

Control Configuration

Company information notes a tiller-control application; verify against the original engine

Year / Serial Coverage

Not specified in the available company product information

What's in the Box

• 1 × Carburetor assembly

This is a single carburetor assembly, not a multi-part kit. Gaskets, hoses, linkage components and other installation hardware are included only if shown or specifically stated by the seller.

Installation Notes

1. Confirm the engine model, horsepower, stroke, cylinder count, control style and original carburetor number before beginning installation.
2. Disconnect the battery, fuel supply and any applicable electrical connections. Work in a well-ventilated area away from ignition sources.
3. Remove the engine cover and document the routing of the fuel line, throttle linkage and any choke or enrichment linkage.
4. Disconnect the linkage and fuel line from the original carburetor.
5. Remove the original carburetor from the intake assembly using the correct tools.
6. Inspect the intake sealing surface and replace any damaged gasket or seal before installation.
7. Position the replacement carburetor with the correct orientation and align the mounting points.
8. Secure the carburetor evenly using the manufacturer's torque specification for the engine.
9. Reconnect the fuel line and all throttle, choke or enrichment linkages exactly as documented during removal.
10. Prime the fuel system if equipped with a primer bulb, then inspect all connections for leaks before starting the engine.
11. Start the engine in accordance with the service manual and check idle quality, throttle response and fuel leakage.
12. Perform any required idle-speed, mixture or linkage adjustments only according to the applicable engine service manual.

Troubleshooting & FAQ

How do I confirm this carburetor fits my engine?

Compare your engine's complete model designation, horsepower, 4-stroke specification, 2-cylinder configuration, control style and original carburetor number with the information on this page. The company-listed applications include Tohatsu MFS20C, F15C, F20C, MFS15C and NSF15C, plus selected Mercury Mariner 15–20 HP 4-stroke 2-cylinder applications. If any detail differs, confirm the application before ordering.

Is this a kit or a single replacement part?

This product is a single carburetor assembly. It is not identified by the company as a kit, and additional gaskets, hoses or linkage parts should not be assumed to be included.

Can this carburetor be used on a 15 HP engine?

The company information lists 15 HP applications and notes that the applicable setup may increase 15 HP output to 20 HP. Verify the exact engine model, tiller-control configuration and original carburetor number before installation.

Can I use this on a remote-control engine?

The company information specifically notes a tiller-control application, while the broader fitment record does not provide a complete control-style range. Do not assume remote-control compatibility; compare the linkage and original part number before ordering.

What symptoms may indicate a faulty carburetor?

Common symptoms include hard starting, rough or unstable idle, hesitation during acceleration, poor throttle response, fuel leakage or repeated stalling. Check fuel quality, filters, fuel lines, ignition components and adjustment settings before replacing the carburetor.

Do I need to adjust the carburetor after installation?

Adjustment requirements depend on the engine model and service procedure. Follow the applicable manufacturer's service manual for idle, mixture, linkage and final operating checks. Do not use generic adjustment values in place of the engine-specific specifications.

Why are several manufacturer part numbers listed?

The listed numbers are manufacturer and reference numbers associated with the product records for different applications. They are provided for cross-reference, but complete fitment still depends on the engine model, specifications, control configuration and original carburetor.

Safety & Important Info

• Verify the complete engine model and original carburetor number before purchase.
• Do not rely on horsepower alone; stroke, cylinder configuration and control linkage must also match.
• Use the applicable engine service manual for torque values, adjustment procedures and operating checks.
• Fuel-system work should be performed with the engine stopped, fuel isolated and ignition sources removed.
• Professional installation is recommended if you are unfamiliar with outboard fuel-system service.