Carburetor Rebuild Kit – Fits Yamaha 40-50 HP 2-Stroke Outboards (Replaces 6H4-W0093-03-00, 6H4-W0093-04-00)

Carburetor Rebuild Kit – Fits Yamaha 40-50 HP 2-Stroke Outboards (Replaces 6H4-W0093-03-00, 6H4-W0093-04-00)

This complete carburetor rebuild kit is designed for Yamaha 2-Stroke 40-50 HP (1989–2009) outboard engines, providing all necessary components to rebuild the three carburetors on these models.

It is a direct replacement for Yamaha OEM part numbers 6H4-W0093-03-00 and 6H4-W0093-04-00, as well as aftermarket parts Sierra 18-7768 and Mallory 9-37503.

• Installation: Designed for a direct OEM replacement fit.
• Complete Kit: Includes all gaskets, seals, and internal components to service all three carburetors.
• Fuel Compatibility: Engineered for use with gasoline fuel systems.

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 Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

This kit includes the following components to rebuild all 3 (THREE) carburetors:

• 1 x Gasket (6H4-14198-09-00)
• 3 x Cap (679-14966-00-00)
• 3 x Needle Valve Assembly (6H3-14590-01-00)
• 3 x Clip (633-14159-00-00)
• 3 x Pin, Float (676-14186-00-00)
• 3 x Float (6G1-14985-00-00)
• 3 x Pin, Float Arm (688-14548-00-00)
• 3 x O-Ring (6G1-14984-00-00)
• 3 x Screw, With Washer (97980-04114-00)
• 3 x O-Ring (93210-04230-00)
• 3 x Gasket (663-14126-00-00)
• 3 x Gasket (688-14126-00-00)
• 3 x Screw, Pilot (692-14923-00-00)
• 3 x O-Ring (93210-15M52-00)

Installation Guide

1. Safety First: Disconnect the battery and fuel lines. Ensure you are working in a well-ventilated area away from open flames or sparks.
2. Removal: Carefully remove all three carburetors from the engine. Mark their positions if necessary.
3. Disassembly: Disassemble one carburetor at a time to avoid mixing parts. Lay out all components in an organized manner.
4. Cleaning: Thoroughly clean all metal parts with a quality carburetor cleaner. Do not use cleaner on non-metal parts like O-rings and gaskets.
5. Component Inspection: Remove all old gaskets, seals, and O-rings. Inspect jets and passages for any blockages.
6. Install New Parts: Carefully install the new needle valve assembly, float, and pin from the kit. Ensure the float height is set to manufacturer specifications.
7. Replace Seals: Install all new gaskets and O-rings provided in the kit.
8. Reassembly: Reassemble the carburetor, ensuring all screws and jets are tightened correctly but not over-torqued.
9. Repeat: Repeat the cleaning and rebuilding process for the other two carburetors.
10. Reinstallation: Reinstall the rebuilt carburetors onto the engine and securely reconnect the fuel lines.
11. Final Check: Reconnect the battery. Start the engine, check for any fuel leaks, and adjust the idle speed as needed.

Troubleshooting & FAQ

Q: How can I confirm this kit will fit my specific Yamaha outboard?
A: This kit is designed for Yamaha 40-50 HP 2-Stroke outboards manufactured between 1989 and 2009. To ensure a perfect match, please check the "Compatible Engine Models" table on this page. The most reliable method is to cross-reference the OEM part number (6H4-W0093-04-00 or 6H4-W0093-03-00) with your existing part or service manual.

Q: Does this kit service all the carburetors on my engine?
A: Yes, this is a complete kit that includes all the necessary components to rebuild all three (3) carburetors found on the compatible Yamaha 40 HP and 50 HP 2-stroke models.

Q: What are common signs that my engine's carburetors need to be rebuilt?
A: Symptoms of failing carburetors include difficulty starting, rough idling, stalling at low speeds, engine bogging or hesitation during acceleration, and excessive black smoke from the exhaust. These issues are often caused by degraded gaskets, clogged jets, or an incorrect fuel-to-air mixture from a faulty float assembly.

Q: OEM vs. Aftermarket?
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.