Yamaha Outboard Ignition Switch – 2 & 4-Stroke Control Box, 15–300 HP
Yamaha Outboard Ignition Switch – 2 & 4-Stroke Control Box, 15–300 HP is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Yamaha Outboard Ignition Switch – 2 & 4-Stroke Control Box, 15–...
Yamaha Outboard Ignition Switch – 2 & 4-Stroke Control Box, 15–300 HP is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket ignition switch assembly is designed for Yamaha outboard control boxes on selected 2-stroke and 4-stroke applications. It provides the main ignition-switch functions required for compatible Yamaha outboards and includes a push-to-choke function.
The switch is associated with Yamaha OEM reference numbers 703-82510-40, 703-82510-41, 703-82510-42, 703-82510-43, 703-82510-44, and 703-82510-45. Sierra Marine reference MP51040 is an aftermarket cross-reference for a Yamaha control-box ignition switch that replaces Yamaha 703-82510-43-00.
- For Yamaha outboard control-box applications.
- Compatible with selected 2-stroke and 4-stroke engines within the fitment ranges below.
- Push-to-choke function for compatible control-box systems.
- Aftermarket replacement component; not manufactured by Yamaha.
Part Number Matrix
Use these references together with your engine model, horsepower, stroke type, control-box configuration, and original switch before ordering.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 703-82510-40 | OEM reference listed for this product |
| Yamaha | 703-82510-41 | OEM reference listed for this product |
| Yamaha | 703-82510-42 | OEM reference listed for this product |
| Yamaha | 703-82510-43 | OEM reference listed for this product |
| Yamaha | 703-82510-44 | OEM reference listed for this product |
| Yamaha | 703-82510-45 | OEM reference listed for this product |
| Yamaha | 703-82510-43-00 | Reference confirmed for the Sierra MP51040 cross-reference |
| Sierra Marine | MP51040 | Aftermarket cross-reference for Yamaha control-box ignition switch |
Engine Compatibility
The company fitment information identifies the following Yamaha outboard application groups. These ranges are not a substitute for matching the original switch, connector, control-box layout, and engine model.
| Brand | Application | Horsepower | Stroke |
|---|---|---|---|
| Yamaha | 2- or 3-cylinder outboards | 15–40 HP | 2-Stroke and 4-Stroke |
| Yamaha | 4-cylinder outboards | 50–150 HP | 2-Stroke and 4-Stroke |
| Yamaha | 6-cylinder outboards | 150–300 HP | 2-Stroke and HPDI |
| Yamaha | 6-cylinder 3.3L outboards | 200–225 HP | 4-Stroke |
Catalog evidence also identifies the corresponding main-switch assembly reference on selected 2003 Yamaha 225 HP and 250 HP 2-stroke models, including LX and SX variants. Confirm the exact model and control-box configuration before installation.
Technical Specifications
- Product Type
- Ignition switch assembly
- Application
- Yamaha outboard control box
- Compatible Stroke Types
- Selected 2-stroke and 4-stroke applications as listed above
- Function
- Ignition switching with push-to-choke function
- Aftermarket Reference
- Sierra Marine MP51040
- Replacement References
- Yamaha 703-82510-40, 703-82510-41, 703-82510-42, 703-82510-43, 703-82510-44, and 703-82510-45
What's in the Box
- 1 x Ignition switch assembly
Keys and additional accessories are not specified in the company product record. Verify the product images and package received before installation.
Installation Notes
- Disconnect the battery and follow the engine manufacturer's safety procedures.
- Access the ignition switch at the Yamaha remote control box.
- Record the existing wire positions before disconnecting the original switch.
- Disconnect the wiring from the old switch and remove the retaining hardware.
- Install the replacement switch in the same control-box position and orientation.
- Reconnect the wiring according to the original configuration. Do not rely on wire color alone if the existing harness has been modified.
- Secure the switch without overtightening, reconnect the battery, and test the OFF, RUN, START, and push-to-choke functions where applicable.
Professional installation is recommended if the original wiring, connector, or control box does not match the replacement.
Troubleshooting & FAQ
How do I confirm fitment?
Match your original switch and control box to the product images, then verify the Yamaha engine model, horsepower, stroke type, and one of the listed OEM reference numbers. Horsepower alone is not sufficient to confirm fitment.
Does this switch fit both 2-stroke and 4-stroke Yamaha outboards?
Yes, it is listed for selected Yamaha 2-stroke and 4-stroke applications. The applicable engine-cylinder and horsepower ranges are shown in the compatibility table.
Does it have a push-to-choke function?
Yes. The switch is listed with a push-to-choke function for compatible Yamaha control-box systems.
Is this an OEM Yamaha part?
No. This is an aftermarket replacement ignition switch assembly. Yamaha and Sierra numbers shown on this page are reference numbers used to help confirm compatibility.
Are keys included?
The company product record specifies one ignition switch assembly and does not specify keys as included contents. Do not assume that keys or other accessories are included unless shown in the current product package or images.
What are common symptoms of a failing ignition switch?
Possible symptoms include intermittent starting, loss of ignition power, unreliable RUN or START operation, difficulty activating the choke function, or a loose or corroded switch connection. Test the wiring and battery circuit before replacing the switch.
Can I install it without checking the wiring?
No. Disconnect the battery, document the original wiring, and verify that the connector and terminal arrangement match before installation.
What are your shipping speed and cost?
Shipping options and delivery estimates are displayed at checkout and may vary by destination and service selected.
What is the warranty and return policy?
Warranty and returns are handled according to the seller's current policy. Contact support with your order details if you need assistance.
Safety & Important Information
- Disconnect the battery before working on the ignition-switch wiring.
- Verify the engine model, horsepower, stroke type, control-box configuration, connector, and OEM reference before ordering.
- Do not install the switch if the terminals, connector, or mounting arrangement differs from the original.
- This is an aftermarket replacement, not an OEM Yamaha component.
- Professional installation is recommended when wiring or control-box compatibility is uncertain.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for maintenance and repair applications.
- Fitment-Focused Information — Product references and application details are provided to help you compare your original part.
- Customer Support — Contact support with your engine and original-part details when you need help confirming compatibility.
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