6H1-14301/14302/14303 Carburetor Assy Set for Yamaha 90HP Outboard | JLM Marine

Carburetor Assy Set – Fits Yamaha 90HP 2-Stroke Outboard Engines

This complete carburetor assembly set is engineered for Yamaha 90HP 2-stroke outboard motors, delivering reliable fuel delivery and consistent engine performance. Built to precise OEM specifications, this three-piece set includes top, middle, and bottom carburetors designed to replace factory parts directly.

Direct replacement for Yamaha OEM part numbers 6H1-14301, 6H1-14302, and 6H1-14303, ensuring seamless compatibility with your original equipment.

• Complete 3-carburetor assembly set for triple-cylinder configuration
• Premium aluminum alloy construction for long-term durability
• Direct bolt-on installation with factory mounting points

Part Number Cross-Reference

Use this table to confirm equivalent part numbers for your Yamaha outboard carburetor replacement.

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

• 3 × Carburetor Assemblies (Top, Middle, Bottom)

Installation Guide

1. Disconnect the battery and fuel line to ensure safe working conditions. Allow the engine to cool completely before beginning.
2. Remove the engine cowling and locate the existing carburetor assemblies mounted on the intake manifold. Take photos for reference during reassembly.
3. Disconnect throttle linkages, choke cables, and fuel lines from each carburetor. Label each connection to simplify reinstallation.
4. Unbolt the mounting hardware securing the old carburetors to the intake manifold. Remove the carburetors carefully to avoid damaging gasket surfaces.
5. Inspect and clean the intake manifold mounting surfaces, removing old gasket material or debris. Replace intake gaskets if worn or damaged.
6. Position the new bottom carburetor (6H1-14303-05-00) onto the intake manifold with a fresh gasket. Secure with mounting bolts, tightening evenly in a cross pattern.
7. Install the middle carburetor (6H1-14302-02-00) in the same manner, ensuring proper alignment with mounting holes and fuel passages.
8. Install the top carburetor (6H1-14301-04-00), verifying all three units are seated flush and evenly torqued.
9. Reconnect fuel lines to each carburetor inlet, ensuring clamps are tight and connections are secure to prevent fuel leaks.
10. Reattach throttle linkages and choke cables to their respective positions on each carburetor. Verify smooth operation and full range of motion.
11. Reconnect the battery and turn the fuel valve on, inspecting all connections for leaks. Prime the fuel system if necessary.
12. Start the engine and allow it to warm up, adjusting idle mixture and synchronization as needed. Reinstall the cowling once performance is verified.

Troubleshooting & FAQ

Q: How do I confirm this carburetor set fits my Yamaha outboard?
A: Verify that your engine is a Yamaha 90HP 2-stroke model and cross-reference the OEM part numbers (6H1-14301-04-00, 6H1-14302-02-00, 6H1-14303-05-00) with your service manual or existing carburetor tags. You can also use the Yamaha serial number guide linked above to identify your engine model and year.

Q: What are the main benefits of this carburetor set over the original?
A: This set improves throttle response, delivers fine fuel atomization for easy starts and quick throttle inputs, and promotes efficient combustion to reduce carbon buildup. The aluminum alloy construction ensures durability comparable to OEM parts.

Q: How often should I replace or service my carburetors?
A: Carburetor lifespan depends on fuel quality, usage conditions, and maintenance. Inspect and clean carburetors annually or every 100 operating hours. Replace if you experience persistent rough idling, poor throttle response, or fuel leaks that cleaning cannot resolve.

Q: What are common signs that my carburetors need replacement?
A: Watch for symptoms such as difficulty starting, rough or inconsistent idle, hesitation during acceleration, excessive fuel consumption, black smoke from the exhaust, or visible fuel leaks around carburetor bodies or gaskets.

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.