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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.
6G5-45383-01-00
Pro Marine Yamaha-Style Single Engine Switch Panel
Aftermarket 704-Series Main Key Switch Panel for Yamaha Outboards
This Pro Marine single engine switch panel is an aftermarket replacement for compatible Yamaha 704-series single engine rigging systems.
Designed as a replacement option for Yamaha-style main switch panels, this assembly is used for ignition, engine stop, warning horn, and push-to-choke functions on compatible Yamaha outboard control setups.
Compatible Applications
| Brand | Rigging Type | Engine Setup | Application Notes |
|---|---|---|---|
| Yamaha | 704-Series Rigging | Single Engine | For compatible Yamaha single engine switch panel installations |
| Yamaha | Mechanical Control Systems | Single Engine | Commonly used with Yamaha mechanical shift outboard control setups |
| Yamaha | Compatible Harness Systems | Single Engine | Use where the existing switch panel and harness match the listed Yamaha OEM numbers |
| Yamaha | Push-to-Choke Applications | Single Engine | For compatible Yamaha engines and rigging using push-to-choke switch function |
Fitment depends on the main harness, control box, switch panel connector, and engine rigging configuration. Always verify your existing Yamaha part number and connector style before ordering.
OEM Part Numbers & Cross References
| Brand / Type | Part Number |
|---|---|
| Pro Marine | 82570P |
| Replaces Yamaha OEM | 704-82570-13-00 |
| Replaces Yamaha OEM | 704-82570-12-00 |
| Replaces Yamaha OEM | 704-82570-11-00 |
| Replaces Yamaha OEM | 704-82570-10-00 |
| Replaces Yamaha OEM | 704-82570-08-00 |
| Replaces Yamaha OEM | 704-82570-07-00 |
| Replaces Yamaha OEM | 704-82570-06-00 |
| Replaces Yamaha OEM | 704-82570-05-00 |
| Replaces Yamaha OEM | 704-82570-04-00 |
| Replaces Yamaha OEM | 704-82570-03-00 |
| Replaces Yamaha OEM | 704-82570-02-00 |
| Replaces Yamaha OEM | 704-82570-01-00 |
| Replaces Yamaha OEM | 6R5-82570-05-00 |
| Replaces Yamaha OEM | 6R5-82570-04-00 |
| Replaces Yamaha OEM | 6R5-82570-03-00 |
| Replaces Yamaha OEM | 6R5-82570-02-00 |
| Replaces Yamaha OEM | 6R5-82570-01-00 |
| Replaces Yamaha OEM | 6R5-82570-00-00 |
| Alternate Search Format | 704825701300 |
| Alternate Search Format | 82570P |
OEM Yamaha Option
Prefer the genuine Yamaha version? See the OEM Yamaha single engine switch panel .
What This Switch Panel is Used For
This Pro Marine switch panel is used as the main ignition and stop switch panel for compatible Yamaha single engine outboard rigging systems.
The key switch controls engine ignition and starting, while the emergency stop switch works with the safety lanyard to shut the engine off when activated.
The panel also supports push-to-choke operation on compatible Yamaha applications and includes the warning horn function used by supported Yamaha warning systems.
Replacing a damaged or worn switch panel can help restore reliable starting, shutdown, choke operation, and operator warning functionality.
Key Features and Benefits
- Pro Marine aftermarket single engine switch panel
- Replacement for compatible Yamaha 704-series switch panel assemblies
- Replaces Yamaha OEM 704-82570 and 6R5-82570 part number families
- Designed for compatible Yamaha single engine rigging systems
- Includes main ignition key switch function
- Includes emergency stop switch / safety lanyard function
- Supports push-to-choke function on compatible applications
- Includes warning horn function for supported Yamaha warning systems
- Aftermarket alternative to the OEM Yamaha switch panel
Switch Panel Details
- Brand: Pro Marine
- Part Type: Single Engine Main Switch Panel
- Pro Marine Part Number: 82570P
- Replaces OEM: Yamaha 704-82570-13-00 and related 704 / 6R5 switch panel numbers
- Rigging Type: Yamaha 704-Series Compatible Rigging
- Engine Setup: Single Engine
- Functions: Ignition, stop switch, warning horn, push-to-choke
- Application: Compatible Yamaha outboard control systems
- Quantity Sold: Each
FAQ
What does Pro Marine 82570P replace?
This Pro Marine switch panel replaces compatible Yamaha 704-82570 and 6R5-82570 single engine switch panel assemblies.
Is this the OEM Yamaha panel?
No. This is the Pro Marine aftermarket replacement version. The genuine Yamaha OEM version is also available separately.
Does this fit every Yamaha outboard?
No. Fitment depends on the rigging system, harness connector, control style, and original switch panel part number.
Does this panel include the warning horn?
This replacement panel is designed for the same style of Yamaha single engine switch panel system that includes warning horn functionality.
Does this panel support push-to-choke?
Yes. It is intended for compatible Yamaha-style switch panel applications using push-to-choke function.
Is this for single engine installations?
Yes. This is a single engine switch panel and should not be used in place of twin or triple engine panels.
Should I compare my existing part number before ordering?
Yes. Match your existing Yamaha part number, harness connector, and rigging configuration to the cross-reference list 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.
- Electrical components should be installed only after confirming correct fitment.
- Items must be new, unused, and in original packaging.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
82570P, Pro Marine 82570P, 704-82570-13-00, 704825701300, 704-82570-12-00, 704-82570-11-00, 704-82570-10-00, 704-82570-08-00, 704-82570-07-00, 704-82570-06-00, 704-82570-05-00, 704-82570-04-00, 704-82570-03-00, 704-82570-02-00, 704-82570-01-00, 6R5-82570-05-00, 6R5-82570-04-00, 6R5-82570-03-00, 6R5-82570-02-00, 6R5-82570-01-00, 6R5-82570-00-00, Yamaha aftermarket switch panel, Pro Marine Yamaha switch panel, Yamaha single engine switch panel, Yamaha 704 switch panel, Yamaha key switch panel, Yamaha ignition switch panel, Yamaha push to choke switch, Yamaha emergency stop switch panel, Yamaha warning horn switch panel
6R5-82570-01-00
6R5-82570-02-00
6R5-82570-03-00
6R5-82570-04-00
6R5-82570-05-00
704-82570-01-00
704-82570-02-00
704-82570-03-00
704-82570-04-00
704-82570-05-00
704-82570-06-00
704-82570-07-00
704-82570-08-00
704-82570-10-00
704-82570-11-00
704-82570-12-00
704-82570-13-00
6E5-11610-21-00
6E5-11610-22-00
6E5-11610-23-00
6J9-11610-20-00
6K7-11610-20-00
6K7-11610-21-00
Pro Marine Yamaha Piston Ring Kit
Yamaha 115-250HP Standard Piston Ring Kit
The Pro Marine 3937 Standard Piston Ring Kit is a premium aftermarket replacement for a wide range of Yamaha 2-stroke outboards. Designed for standard bore applications, this ring kit replaces several Yamaha OEM piston ring assemblies and is commonly used during powerhead rebuilds, piston replacement, compression repairs, and complete engine overhauls.
Pro Marine piston rings are manufactured to meet or exceed OEM specifications for fit, durability, and performance. This kit replaces Yamaha OEM numbers 6K7-11601-02-00, 6R5-11603-00-00, 64D-11603-00-00, 64D-11603-01-00, and 64D-11603-02-00.
Compatible Applications
Based on Yamaha OEM supersessions and application data, this piston ring kit is commonly found in many Yamaha V4 and V6 carbureted, EFI, Saltwater Series, ProV, Excel, and OX66 outboards using the OEM numbers listed above.
| Manufacturer | Models | Years |
|---|---|---|
| Yamaha | 115HP 2-Stroke | Various Applications |
| Yamaha | 130HP 2-Stroke | Various Applications |
| Yamaha | 150HP 2-Stroke | Various Applications |
| Yamaha | 175HP 2-Stroke | Various Applications |
| Yamaha | 200HP 2-Stroke | Various Applications |
| Yamaha | 225HP 2-Stroke | Various Applications |
| Yamaha | 250HP 2-Stroke | Various Applications |
Yamaha used multiple piston and ring configurations across engines with similar horsepower ratings. Always verify your original Yamaha OEM piston ring number before ordering.
This kit replaces OEM numbers 6K7-11601-02-00, 6R5-11603-00-00, 64D-11603-00-00, 64D-11603-01-00, and 64D-11603-02-00.
OEM & Cross Reference Numbers
| Type | Part Number |
|---|---|
| Pro Marine | 3937 |
| Yamaha OEM | 6K7-11601-02-00 |
| Yamaha OEM | 6R5-11603-00-00 |
| Yamaha OEM | 64D-11603-00-00 |
| Yamaha OEM | 64D-11603-01-00 |
| Current Yamaha OEM | 64D-11603-02-00 |
| Sierra | 18-39320 |
Product Specifications
- Brand: Pro Marine
- Part Number: 3937
- Part Type: Piston Ring Kit
- Size: Standard Bore
- Bore Diameter: 3.544"
- Engine Type: Yamaha 2-Stroke Outboards
- Application: Standard Bore Rebuilds and Piston Service
Alternative Brand Available
GLM 3937GM Standard Piston Ring Kit
Looking for the GLM version? We also stock the GLM 3937GM Standard Piston Ring Kit which fits the same Yamaha applications and OEM cross references.
What This Part Is Used For
Piston rings play a critical role in maintaining cylinder compression, controlling combustion chamber sealing, and transferring heat from the piston to the cylinder wall. During engine rebuilds, replacing worn piston rings is essential for restoring proper compression and performance.
This standard bore ring kit is intended for engines that remain within factory bore specifications and do not require oversized pistons or rings.
Key Features & Benefits
- Pro Marine premium aftermarket piston ring kit
- Standard bore replacement
- 3.544" bore size
- Replaces multiple Yamaha OEM piston ring assemblies
- Ideal for powerhead rebuilds and piston replacement
- Manufactured to OEM specifications
- GLM alternative available and linked above
FAQ
Is this a standard size ring kit?
Yes. Part number 3937 is a standard bore piston ring kit.
What Yamaha OEM numbers does this replace?
It replaces 6K7-11601-02-00, 6R5-11603-00-00, 64D-11603-00-00, 64D-11603-01-00, and 64D-11603-02-00.
Can I use this on an oversized piston?
No. This is a standard-size ring kit. Oversized pistons require matching oversized rings.
Do you carry another brand?
Yes. We also stock the GLM 3937GM version linked above.
Should I replace rings during a rebuild?
Yes. Replacing piston rings is considered standard practice during most powerhead rebuilds and piston service procedures.
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 internal engine 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 Terms
3937, 3937GM, Yamaha piston ring kit, Yamaha standard ring kit, Yamaha 115 piston rings, Yamaha 130 piston rings, Yamaha 150 piston rings, Yamaha 175 piston rings, Yamaha 200 piston rings, Yamaha 225 piston rings, Yamaha 250 piston rings, Yamaha V4 piston rings, Yamaha V6 piston rings, Yamaha powerhead rebuild, 6K7-11601-02-00, 6R5-11603-00-00, 64D-11603-00-00, 64D-11603-01-00, 64D-11603-02-00, 18-39320, Pro Marine 3937, GLM 3937GM
6K7-11601-02-00
6R5-11603-00-00
64D-11603-00-00
64D-11603-01-00
64D-11603-02-00
6E5-11610-00-00
6E5-11610-01-00
6E5-11610-02-00
6E5-11610-03-00
6J9-11610-00-00
6K7-11610-00-00
6K7-11610-01-00
6K7-11610-03-00
6R5-11605-00-00
64D-11605-00-00
64D-11605-01-00
64D-11605-02-00
18-3917
509406
88392
88392A12
27841
27841A12
18-3902
45155A12
509398
78816A12
9-54217