Yamaha Control-Box Ignition Switch with Push-to-Choke – Replaces Yamaha 703-82510-43-00 and Sierra MP51040
Yamaha Control-Box Ignition Switch with Push-to-Choke – Replaces Yamaha 703-82510-43-00 and Sierra MP51040 is backordered and will ship as soon as it is back in stock.
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Yamaha Control-Box Ignition Switch with Push-to-Choke – Replaces Ya...
Yamaha Control-Box Ignition Switch with Push-to-Choke – Replaces Yamaha 703-82510-43-00 and Sierra MP51040 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Yamaha control-box ignition switch is designed for selected Yamaha 2-stroke and 4-stroke outboard control-box applications. It includes a push-to-choke function and is identified as a replacement for Yamaha part number 703-82510-43-00 and Sierra reference MP51040.
The Sierra catalog identifies this switch for Yamaha control boxes, with wire colors matching factory color codes. Always compare the connector, terminal arrangement, key position markings, and mounting dimensions with your existing switch before ordering.
- Control-Box Application: Intended for selected Yamaha outboard control-box ignition systems.
- Push-to-Choke Function: Pressing the key activates the choke circuit where supported by the engine and control box.
- Two- and Four-Stroke Coverage: Catalog information identifies the application for Yamaha 2-stroke and 4-stroke control-box systems.
- Factory-Color Wire Coding: Wire colors are identified as matching factory color codes in the referenced Sierra catalog.
Part Number Matrix
These are the identified manufacturer and aftermarket reference numbers for this ignition switch. A reference number alone does not confirm fitment for every Yamaha model.
| Brand | Part Number | Reference |
|---|---|---|
| Yamaha | 703-82510-43-00 | Manufacturer replacement reference |
| Sierra | MP51040 | Aftermarket reference |
Documented Compatibility Examples
The following listed applications document Yamaha main-switch applications using Yamaha part number 703-82510-43-00. They are examples of documented applications, not a universal 6–300 HP or 1998–2013 fitment claim.
| Brand | Model | Rated HP | Year | Stroke | Part No. |
|---|---|---|---|---|---|
| Yamaha | LX225TXRB | 225 | 2003 | 2-Stroke | 703-82510-43-00 |
| Yamaha | LX250TXRB | 250 | 2003 | 2-Stroke | 703-82510-43-00 |
| Yamaha | SX225TURB | 225 | 2003 | 2-Stroke | 703-82510-43-00 |
| Yamaha | SX225TXRB | 225 | 2003 | 2-Stroke | 703-82510-43-00 |
| Yamaha | SX250TURB | 250 | 2003 | 2-Stroke | 703-82510-43-00 |
| Yamaha | SX250TXRB | 250 | 2003 | 2-Stroke | 703-82510-43-00 |
| Yamaha | RIGGING 20 | Verify for your engine | 2006 | 2-Stroke | 703-82510-43-00 |
| Yamaha | RIGGING 20 | Verify for your engine | 2007 | 2-Stroke | 703-82510-43-00 |
Technical Specifications
- Product Type
- Control-box ignition switch
- Application
- Selected Yamaha outboard control boxes
- Stroke Coverage
- 2-stroke and 4-stroke applications are identified in the catalog reference
- Choke Function
- Push-to-choke
- Operating Positions
- Verify the position and terminal configuration against the original switch before installation
- Wire Identification
- Factory-color wire coding identified in the referenced catalog
- Product Classification
- Aftermarket replacement; not a Yamaha OEM component
What's in the Box
- 1 x Yamaha-compatible control-box ignition switch with push-to-choke function
Installation Notes
- Disconnect Power: Turn the engine off and disconnect the boat battery before servicing the ignition circuit.
- Document the Existing Wiring: Photograph and label each wire or connector before removing the original switch.
- Compare the Switches: Confirm the mounting arrangement, connector or terminal layout, key positions, and wire colors match the original component.
- Remove the Old Switch: Access the rear of the control box, disconnect the wiring, and remove the retaining hardware.
- Install the Replacement: Mount the new switch securely and connect the wiring according to the original configuration and the engine manufacturer's wiring information.
- Test Safely: Reconnect the battery and test the OFF, RUN/ON, START, and push-to-choke functions with the engine in a safe operating environment.
Troubleshooting & FAQ
Does this switch fit every Yamaha outboard?
No. The documented references apply to selected Yamaha control-box applications. Horsepower, year, model, control-box design, connector, and terminal layout must all be checked before purchase.
Does it work with both 2-stroke and 4-stroke engines?
The referenced Sierra catalog identifies this control-box switch for Yamaha 2-stroke and 4-stroke applications. Confirm the exact engine and control-box configuration before installation.
How does the push-to-choke function work?
On compatible systems, pressing the key inward while operating the ignition switch activates the engine's choke circuit for starting. The exact operating sequence depends on the engine and control-box design.
Is this a direct plug-and-play replacement?
Fitment is application-specific. Do not assume plug-and-play installation solely from a matching part number; compare the original connector, terminal arrangement, mounting dimensions, and wiring before installation.
What part number does this switch replace?
The documented replacement reference is Yamaha 703-82510-43-00. Sierra MP51040 is the corresponding aftermarket reference identified in the catalog information.
Is this a Yamaha OEM part?
No. This listing is for an aftermarket replacement switch. Yamaha and Sierra names and part numbers are used only to identify application and reference compatibility.
Safety & Important Information
- Disconnect the battery before working on the ignition wiring.
- Verify the original switch, connector, terminal layout, mounting arrangement, and wire colors before ordering or installing.
- Do not rely on horsepower or brand alone to confirm fitment.
- Professional installation is recommended when the wiring configuration or ignition circuit is uncertain.
About Sea Sierra
- Marine Replacement Parts — Replacement components for selected marine applications.
- Application-Focused Selection — Confirm the original part and installation details before ordering.
- Aftermarket Value — A replacement option for compatible Yamaha control-box ignition systems.
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