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Outboard Motor Parts | OEM & Aftermarket
Shop OEM and aftermarket outboard motor parts for Mercury, Yamaha, Suzuki, Honda, Johnson / Evinrude / E-TEC, Tohatsu / Nissan, and Chrysler / Force engines. Pro Marine USA carries parts for routine maintenance, troubleshooting, repair, and complete marine engine rebuilds.
Browse by outboard manufacturer or engine system, or use our OEM parts lookup to identify the correct part number before ordering. Find cooling, fuel, ignition, electrical, internal engine, lower unit, steering, trim, service kit, gasket, seal, and rebuild parts in one place.
Shop Outboard Parts by Manufacturer
Chrysler / Force Outboard Parts for Chrysler and Force outboard repair 
Honda Outboard Honda cooling, fuel, electrical, and engine parts 
Johnson / Evinrude / E-TEC Outboard Johnson, Evinrude, E-TEC, and OMC replacement parts 
Mercury Outboard Mercury and Mariner maintenance, repair, and rebuild parts 
Suzuki Outboard Suzuki service, lower unit, fuel, and engine parts 
Tohatsu / Nissan Outboard Tohatsu and Nissan outboard replacement parts 
Yamaha Outboard Yamaha maintenance, repair, lower unit, and rebuild parts Find the Correct Outboard Part
Not sure which part fits your engine? Start with the engine manufacturer, horsepower, model number, serial number, and year whenever available.
Our OEM parts lookup lets you view factory parts diagrams and identify the original part number for many popular outboard engines. Once you have the OEM number, search Pro Marine to find available OEM and aftermarket replacement options.
Use Our OEM Parts Lookup »Shop Outboard Parts by Engine System
Outboard engines use several interconnected systems. Select your manufacturer above to browse the exact categories available for your engine, including the following common repair and maintenance areas.
Common Outboard Problems and Where to Start
- Engine overheating: inspect the water pump, impeller, thermostat, pressure-control components, cooling passages, and engine anodes.
- Hard starting or rough idle: check fuel delivery, carburetor or injector operation, spark plugs, ignition components, filters, and intake sealing.
- Weak spark or no spark: test ignition coils, stators, switch boxes or ignition modules, sensors, wiring, grounds, and related electrical components.
- Low compression or poor power: inspect pistons, rings, cylinder condition, head and powerhead gaskets, bearings, and other internal engine components.
- Milky gear lube: inspect prop shaft, driveshaft, shift shaft, bearing carrier, and other lower unit seals for water intrusion.
- Lower unit or gearcase noise: inspect bearings, gears, clutch components, shafts, and gear lube condition before continued operation.
- Trim or steering problems: inspect hydraulic fluid level, seals, hoses, trim motors, pumps, steering cylinders, and mechanical connections.
Why Buy Outboard Parts from Pro Marine USA?
- OEM and aftermarket replacement options for major outboard engine brands.
- Marine engine parts for routine maintenance, professional repair, and complete rebuild projects.
- OEM diagram and part-number lookup tools to help identify the correct component before ordering.
- Dealer pricing available for qualified marine repair businesses and dealers.
- Large selection of service kits, engine parts, lower unit components, fuel system parts, electrical parts, steering, and rigging products.
- Same-day weekday shipping available on qualifying in-stock orders placed before the shipping cutoff.
OEM and Aftermarket Outboard Parts
OEM parts are supplied by the original engine manufacturer and are designed for the specific engine application. Aftermarket parts are replacement components produced by independent marine parts manufacturers and may provide additional availability or value for many common repairs.
Pro Marine carries both genuine OEM parts and quality aftermarket replacement parts for many outboard maintenance, repair, and rebuild applications. Always confirm fitment using the engine model, serial number, horsepower, year range, or OEM part number when available.
Frequently Asked Questions
How do I find the correct parts for my outboard motor?
Start by identifying the engine manufacturer, horsepower, model number, serial number, and year. Select the manufacturer above to browse by engine system, or use the OEM parts lookup to locate the original part number from a factory diagram.
Can I search Pro Marine by OEM part number?
Yes. If you already have the OEM part number, enter it into the Pro Marine site search to locate available OEM and aftermarket replacement options. If you do not know the part number, use the OEM parts lookup first.
What information should I have before ordering an outboard part?
Have the engine manufacturer, horsepower, model number, serial number, and year whenever possible. An OEM part number from the original component or parts diagram is especially helpful because visually similar parts may fit different engine families.
What is the difference between OEM and aftermarket outboard parts?
OEM parts come from the original engine manufacturer. Aftermarket parts are replacement components manufactured by other marine parts companies for compatible applications. Pro Marine carries both OEM and aftermarket options across many common outboard engine systems.
Are aftermarket outboard motor parts reliable?
Quality aftermarket marine parts are commonly used for maintenance, professional repair, and engine rebuilding. The best option depends on the application, manufacturer, availability, and customer preference.
Do you carry parts for older outboard motors?
Yes. Pro Marine carries parts for many older Mercury, Mariner, Johnson, Evinrude, Chrysler, Force, Yamaha, Honda, Suzuki, Nissan, and Tohatsu outboards. Availability varies by engine family and component.
What outboard parts are commonly replaced during routine maintenance?
Common maintenance items include engine oil, oil filters, fuel filters, spark plugs, water pump impellers, complete water pump kits, thermostats, gear lube, drain plug seals, anodes, and manufacturer-specific service kit components.
Fitment Tip: Outboard parts can vary by model, serial range, horsepower, and production year. Confirm the OEM part number or engine identification information whenever possible before ordering.
703-82510-02-00
703-82510-11-00
703-82510-12-00
703-82510-13-00
703-82510-14-00
Pro Marine Yamaha Push-to-Choke Ignition Switch
Yamaha 15-300HP Push-to-Choke Ignition Switch - 51040
Pro Marine 51040 is an aftermarket replacement push-to-choke ignition key switch for compatible Yamaha 2-stroke and 4-stroke outboard remote control boxes.
This switch combines the normal ignition OFF, RUN and START functions with a push-to-choke function for compatible Yamaha engines.
Designed for compatible Yamaha applications within the supplied 15-300 HP range. Because Yamaha used multiple ignition switch configurations, always verify your original OEM switch number before ordering.
Part Type: Ignition / Main Key Switch
Brand: Pro Marine
OEM or Aftermarket: Aftermarket
Application: Yamaha Outboard Control Box
Supplied Horsepower Range: 15-300 HP
Engine Types: Compatible Yamaha 2-Stroke and 4-Stroke
Switch Function: OFF / RUN / START
Choke Function: Push-to-Choke
Manufacturer Item #: 703-82510-43-00
Pro Marine Item #: 51040
Compatible Applications
Pro Marine 51040 is designed for compatible Yamaha 15-300 HP outboards using the Yamaha 703-series push-to-choke ignition switch found in applicable remote control boxes.
| Application | Fitment | Requirement |
|---|---|---|
| Yamaha Outboard | 15-300 HP | Compatible 703-Series Push-to-Choke Switch |
| Yamaha 2-Stroke | Select Models | Verify OEM Switch Number |
| Yamaha 4-Stroke | Select Models | Verify OEM Switch Number |
Do not order this ignition switch based on horsepower alone.
Yamaha used different ignition switches and control-box configurations across the 15-300 HP range.
Before ordering, verify that your original switch or Yamaha parts schematic calls for one of the following numbers:
703-82510-40-00, 703-82510-41-00, 703-82510-42-00, 703-82510-43-00, 703-82510-44-00 or 703-82510-45-00 .
OEM and Cross Reference Numbers
Pro Marine 51040 cross-references the following Yamaha 703-series push-to-choke main ignition switch numbers.
| Brand / Type | Part Number |
|---|---|
| Pro Marine | 51040 |
| Aftermarket Cross Reference | MP51040 |
| Yamaha OEM | 703-82510-40-00 |
| Yamaha OEM | 703-82510-41-00 |
| Yamaha OEM | 703-82510-42-00 |
| Yamaha OEM / Manufacturer Reference | 703-82510-43-00 |
| Yamaha OEM | 703-82510-44-00 |
| Yamaha OEM | 703-82510-45-00 |
What This Ignition Switch is Used For
The ignition switch is one of the primary electrical controls in a compatible Yamaha remote control box.
Turning the key controls the engine's ignition and starting circuits, allowing the operator to switch the engine off, place the ignition in the run position and engage the starter.
On compatible engines, pressing the key inward activates the push-to-choke function used during engine starting.
Push-to-Choke Function
Pro Marine 51040 is specifically the push-to-choke version of the Yamaha 703-series ignition switch.
Instead of using a separate choke button, the operator pushes the ignition key inward to activate the compatible engine's choke or starting-enrichment circuit.
Yamaha used both push-to-choke and non-push-to-choke ignition switch configurations.
If your existing control has a separate choke button or uses a different ignition-switch number, do not assume this switch is interchangeable.
Match the OEM number whenever possible.
Designed for Yamaha Remote Control Boxes
This switch is intended for compatible Yamaha remote control-box installations, including applications using the Yamaha 703-series control system.
Yamaha 703 control-box diagrams identify later 703-82510-45-00 as the main switch assembly, replacing earlier versions within this switch family.
Heavy-Duty Marine Ignition Switch Construction
The MP51040 / 703-82510 switch design is built as a marine ignition switch for compatible Yamaha control-box applications.
Published specifications for this switch family identify potted construction and a molded umbrella-style key, helping protect the switch in the marine environment.
Factory-Style Wiring
The replacement switch is designed around the factory Yamaha switch configuration, with wire colors corresponding to the applicable factory color coding.
Even with matching wire colors, verify each connection against the applicable Yamaha wiring diagram before installation.
When Should an Ignition Switch Be Replaced?
A Yamaha ignition switch may need replacement when you experience:
- Intermittent engine starting
- No response when turning the key to START
- Loose or worn key operation
- Failed push-to-choke operation
- Corroded switch wiring or terminals
- Physical damage to the switch body
- Water or corrosion damage inside an older control box
- An ignition switch confirmed faulty during electrical diagnosis
Installation Tips
- Disconnect battery power before servicing the ignition circuit.
- Verify the original OEM switch number before removing the old switch.
- Photograph or label the existing wire connections before disassembly.
- Compare the replacement wiring with the applicable Yamaha wiring diagram.
- Inspect the control-box wiring for corrosion or damaged terminals.
- Do not assume that wire color alone confirms the correct connection.
- Secure wiring so it cannot interfere with the throttle or shift mechanism.
- Reconnect battery power only after installation is complete.
- Test OFF, RUN, START and push-to-choke functions after installation.
Key Features and Benefits
- Pro Marine aftermarket Yamaha ignition switch
- For compatible Yamaha 15-300 HP applications
- Designed for Yamaha 2-stroke and 4-stroke control boxes
- OFF / RUN / START key-switch operation
- Push-to-choke function
- Replacement for Yamaha 703-series main switches
- Crosses to six Yamaha 703-82510 OEM numbers
- Factory-style replacement configuration
- Marine-duty potted switch construction
- Molded umbrella-style key design
- Pro Marine item number 51040
- Manufacturer reference 703-82510-43-00
FAQ
What does Pro Marine 51040 fit?
It fits compatible Yamaha 15-300 HP outboards using
the applicable Yamaha 703-series push-to-choke ignition switch. Always
verify the OEM number for exact fitment.
Is 51040 for Yamaha 2-stroke or 4-stroke engines?
The switch is used with compatible Yamaha 2-stroke and
4-stroke remote control-box applications.
Does this ignition switch have push-to-choke?
Yes. 51040 is specifically a push-to-choke ignition switch.
How does the push-to-choke feature work?
On a compatible engine, pressing the ignition key inward activates the
engine's choke or starting-enrichment circuit.
Does 51040 replace Yamaha 703-82510-43-00?
Yes. 703-82510-43-00 is the manufacturer reference
listed for Pro Marine 51040.
Does it replace 703-82510-45-00?
Yes. 703-82510-45-00 is included in the verified
interchange family for this push-to-choke switch.
Does it replace 703-82510-40-00?
Yes. 703-82510-40-00 is also included in the verified
interchange list.
What is MP51040?
MP51040 is an aftermarket cross-reference number associated with this
Yamaha push-to-choke ignition-switch family.
Is this the complete Yamaha remote control box?
No. This listing is for the ignition / main switch assembly,
not the complete throttle and shift remote-control box.
Can I choose this switch just by horsepower?
No. Yamaha used different ignition switches across its engine lineup.
Use the OEM number on your existing switch or Yamaha parts
schematic to verify fitment.
What if I cannot find my original Yamaha part number?
Use the Yamaha OEM parts schematic with your exact model and year to
identify the correct ignition-switch number before ordering.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Part Numbers
51040, MP51040, 703-82510-40-00, 703-82510-41-00, 703-82510-42-00, 703-82510-43-00, 703-82510-44-00, 703-82510-45-00
Searchable Terms
Yamaha ignition switch, Yamaha key switch, Yamaha push to choke switch, Yamaha push-to-choke ignition switch, Yamaha 703 ignition switch, Yamaha 703 key switch, Yamaha control box ignition switch, Yamaha outboard ignition switch, Yamaha 2 stroke ignition switch, Yamaha 4 stroke ignition switch, Yamaha main switch assembly, Yamaha 15HP ignition switch, Yamaha 300HP ignition switch, 703-82510 ignition switch, Pro Marine 51040
703-82510-40-00
703-82510-41-00
703-82510-42-00
703-82510-43-00
703-82510-44-00
703-82510-45-00
93210-12N52-00
37110-92E00
37110-92E01
37110-92E02
37110-94600
37110-94601
37110-94601
37110-94610
37110-94611
37110-94620
37110-95500
37110-99E00
37110-99E01
37110-99E02
3C8650210
3C8650210M
3C8650211
3C8650211M
3C8650212
3C8650212M
67210
77327
78249
816054
816054T1
8160541
880703A1
6H1-43810-12-00
6H1-43810-12-00
Verado
Inline 6 L6
200hp
225hp
250hp
275hp
300hp
350hp
400hp
877769K01
877769Q01
883701K01
9-57816
18-7208
5353
77250
8673
8673B
8983
8983B
5126
9293