Yamaha Ignition Key Switch – Fits Yamaha Outboards 6–300 HP (Replaces 703-82510-43-00)

Yamaha Ignition Key Switch – Fits Yamaha Outboards 6–300 HP (Replaces 703-82510-43-00)

This ignition key switch assembly is designed for a wide range of Yamaha outboard motors, including both 2-stroke and 4-stroke models from 6 HP to 300 HP manufactured between 1998 and 2013. It offers a reliable replacement to get your engine starting smoothly.

It serves as a direct replacement for Yamaha OEM part numbers 703-82510-43-00, 703-82510-42-00, and 703-82510-44-00, as well as Sierra part number MP51040.

• Features a convenient Push-to-Choke function for easier cold starts.
• Constructed with a sealed glue process, making the unit waterproof, dustproof, and insulated for marine environments.
• Simple plug-in connector allows for installation without any special tools—just connect your original cable.

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

• 1 x Ignition Key Switch Assembly (Push to Choke)

Installation Guide

1. Safety First: Before starting, disconnect the boat's battery to prevent electrical shorts.
2. Access the Old Switch: Locate your current ignition switch, typically on the control box or dashboard panel.
3. Disconnect Wiring: Carefully unplug the main wiring harness connector from the back of the old switch.
4. Remove the Old Switch: Unscrew the retaining nut or remove the clips holding the switch in the panel and pull it out.
5. Install the New Switch: Insert the new ignition switch into the panel and secure it with its retaining nut.
6. Reconnect Wiring: Plug the original wiring harness firmly into the connector on the new switch.
7. Reconnect Battery: Re-attach the battery cables, ensuring a secure connection.
8. Test Operation: Turn the key to the 'ON' position to check for power, then test the 'START' position and choke function.

Troubleshooting & FAQ

Q: How do I confirm this switch fits my specific engine?
A: Start by checking your engine's model, year, and horsepower against the "Compatible Engine Models" table. Also, compare your original part number to those listed in the "Part Number Cross-Reference" section to ensure it's a match.

Q: What are the signs of a failing ignition switch?
A: Common symptoms include the engine not starting, intermittent power to accessories, the key feeling loose or getting stuck, or the engine stalling immediately after starting. If you experience these issues, the ignition switch may be the culprit.

Q: My old key doesn't work with the new switch. Is this normal?
A: Yes, this is completely normal. The new ignition switch assembly includes a new set of keys that are matched to the new lock cylinder. You must use the keys provided with this unit.

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.