Carburetor – Fits Tohatsu & Nissan 2.5HP & 3.5HP 2-Stroke (Replaces 3F0-03100-4, 3D5-03100) This carburetor assembly is designed for a precise fit on a range of 2-stroke Tohatsu, Nissan, and Mercury outboard motors. It serves as a direct replacement for multiple OEM part numbers, restoring original fuel system performance and efficiency. This unit is specifically compatible with Tohatsu and Nissan 2.5HP and 3.5HP models from 2002 to 2005, as well as various 2HP to 3.3HP Mercury engines identified by their serial number ranges. Please verify your engine's model, year, and serial number before ordering. Installation Type: Direct Replacement Fuel Compatibility: Gasoline Construction: Marine-grade corrosion-resistant materials for durability in saltwater environments. Part Number Cross-Reference Use this table to confirm equivalent part numbers across OEM and aftermarket brands. Brand Part Number Tohatsu / Nissan 3F0-03100-4 Tohatsu / Nissan 3F0-03100-3 Tohatsu / Nissan 3F0-03100-2 Tohatsu / Nissan 3F0-03100-1 Tohatsu / Nissan 3F0-03100-0 Tohatsu / Nissan 3D5-03100-5 Tohatsu / Nissan 3D5-03100-4 Tohatsu / Nissan 3D5-03100-3 Tohatsu / Nissan 3D5-03100-2 Tohatsu / Nissan 3F0031003M Tohatsu / Nissan 3F0031002M Tohatsu / Nissan 3F0031001M Tohatsu / Nissan 3F0031000M 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. Brand Model Rated HP Stroke Years OEM Part No. Notes Tohatsu M3.5A2 3.5 2-Stroke 2002 & Earlier 3F0-03100-4 Tohatsu M3.5B2 3.5 2-Stroke 2002 & Earlier 3F0-03100-4 Tohatsu M3.5A2 3.5 2-Stroke 2003 3F0-03100-4 Tohatsu M3.5B2 3.5 2-Stroke 2003 3F0-03100-4 Tohatsu M3.5A2 3.5 2-Stroke 2004 3F0-03100-4 Tohatsu M3.5B2 3.5 2-Stroke 2004 3F0-03100-4 Tohatsu M3.5A2 3.5 2-Stroke 2005 3F0-03100-4 Tohatsu M3.5B2 3.5 2-Stroke 2005 3F0-03100-4 Nissan NS3.5B2 3.5 2-Stroke 2002 & Earlier 3F0-03100-4 Nissan NS3.5A2 3.5 2-Stroke 2003 3F0-03100-4 Nissan NS3.5B2 3.5 2-Stroke 2003 3F0-03100-4 Nissan NS3.5A2 3.5 2-Stroke 2004 3F0-03100-4 Nissan NS3.5B2 3.5 2-Stroke 2004 3F0-03100-4 Nissan NS3.5A2 3.5 2-Stroke 2005 3F0-03100-4 Nissan NS3.5B2 3.5 2-Stroke 2005 3F0-03100-4 Mercury 2.5 2-Stroke Serial number: 017000+ Mercury 3 2-Stroke Serial number: 0A855097 to 0G710612 Mercury 3.3 2-Stroke Serial number: 0D901217+ Technical Specifications Specification Value Product Type Carburetor Assembly Installation Direct Replacement Fuel Type Gasoline Housing Material Zinc Alloy Other Technical Attributes Marine-grade corrosion resistant construction Package Contents 1 x Carburetor Assembly (3F0-03100-4/3D5-03100) Installation Guide Safety First: Disconnect the battery terminals and ensure the engine is off and cool. Shut off the fuel supply. Disconnect Lines: Carefully disconnect the fuel lines and any throttle linkages connected to the old carburetor. Note their positions for reassembly. Remove Old Carburetor: Unscrew the mounting bolts holding the carburetor to the intake manifold. Remove the old unit and gasket. Clean Surface: Clean the manifold mounting surface to ensure a proper seal with the new gasket. Install New Carburetor: Position the new gasket and carburetor, then tighten the mounting bolts evenly. Reconnect Lines: Re-attach the fuel lines and throttle linkages to their original positions. Final Checks: Turn the fuel supply back on and check for any leaks. Reconnect the battery. Test: Start the engine and let it warm up. Adjust idle settings if necessary according to your engine's service manual. Troubleshooting & FAQ Q: How do I confirm this part fits my Tohatsu or Nissan engine? A: Your engine's model and year are critical. Compare them against the detailed list in the "Compatible Engine Models" table. This carburetor fits specific 2.5HP and 3.5HP 2-stroke models from 2002-2005. Q: Will this fit my Mercury outboard? A: For Mercury engines, fitment depends on the serial number, not the model name or year. Please locate your engine's serial number and check if it falls within the ranges listed in our compatibility table (e.g., 017000+, 0A855097-0G710612, etc.). Q: What are common signs that my carburetor needs replacement? A: Symptoms of a faulty carburetor include difficulty starting, stalling at low speeds, poor or rough idling, black smoke from the exhaust, and engine hesitation or surging during acceleration. Q: Is this an OEM part or an aftermarket replacement? 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.
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