3G2-03100-2 Carburetor Assembly for Mercury Mariner Tohatsu Nissan M9.9 M15 M18 NS9.9D2 NS15D2 NS18E2 | JLM Marine

3G2-03100-2 Carburetor Assembly for Mercury Mariner Tohatsu Nissan M9.9 M15 M18 NS9.9D2 NS15D2 NS18E2

This aftermarket replacement carburetor assembly is engineered for Mercury Mariner 9.9 HP, 15 HP, and 18 HP 2-stroke outboard engines, as well as compatible Tohatsu and Nissan M9.9, M15, M18, NS9.9D2, NS15D2, and NS18E2 models from 2003 onward. It delivers reliable fuel delivery and precise air-fuel mixing for consistent engine performance.

This carburetor directly replaces OEM part number 3G2-03100-2 and supersedes multiple earlier versions including 3G2-03100-0M, 3G2-03100-1M, and 3G2-03100-2M, offering broad compatibility across Mercury, Tohatsu, and Nissan 2-stroke outboards.

• Includes carburetor assembly and mounting gasket (27-803699001)
• Designed for 2-stroke outboard engines only
• Verify OEM part number and photos before purchase—older pre-1996 models may require different carburetors

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• Carburetor Assembly × 1
• Paper Gasket (27-803699001) × 1

Installation Guide

1. Disconnect the fuel line and remove the old carburetor from the engine, taking note of linkage and throttle connections.
2. Clean the mounting surface on the intake manifold to ensure a proper seal.
3. Install the new paper gasket (27-803699001) onto the mounting surface. Ensure it is aligned correctly with all bolt holes.
4. Position the new carburetor assembly onto the gasket and secure it with the original mounting bolts, tightening evenly in a cross pattern.
5. Reconnect all fuel lines, throttle linkages, and choke cables, ensuring they move freely without binding.
6. Prime the fuel system and check for leaks around the carburetor and fuel connections.
7. Start the engine and allow it to warm up. Adjust idle speed and fuel mixture screws as needed for smooth operation.
8. Test the engine at various throttle positions to confirm proper acceleration and response.

Troubleshooting & FAQ

Q: How do I confirm this carburetor fits my engine?
A: Verify your engine model, horsepower, and year against the compatibility table above. Check your OEM part number (3G2-03100-0M, 3G2-03100-1M, 3G2-03100-2M, or 3G2-03100-2) to ensure a match. Note that older 2-stroke models manufactured before 1996 use a different carburetor design.

Q: What are common signs that my carburetor needs replacement?
A: Symptoms include difficulty starting, rough idling, poor acceleration, excessive fuel consumption, black smoke from the exhaust, or fuel leaking from the carburetor body. If adjustment and cleaning do not resolve these issues, replacement is recommended.

Q: How often should I replace or service my carburetor?
A: Carburetors do not have a fixed replacement interval. Regular cleaning and adjustment during seasonal maintenance can extend life. Replace when performance issues persist despite cleaning, or if internal components are worn or damaged.

Q: Can I use this carburetor on a 4-stroke engine?
A: No. This carburetor is designed exclusively for 2-stroke outboard engines. Installing it on a 4-stroke engine will result in improper fuel delivery and engine damage.

Q: What is the difference between this aftermarket carburetor and the OEM version?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.