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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.
6DA-12411-01-00
8M0175324
8M6010299
4 Cylinder
100hp Looper
115hp Looper
125hp Looper
834821T
854513T
855746A2
8M0142695
Mercury Verado Gen A/B Power Steering Hose Kit 8M0078213
Mercury Verado hydraulic power steering hose kit 8M0078213 for Verado systems using the Generation A / Generation B power steering pump. This kit includes both 16ft helm-to-pump hoses: the non-pressure return hose and the pressure-side hose.
Important Application Note
This hose kit is for Mercury Verado hydraulic power steering systems that use the Generation A / Generation B style power steering pump. Always verify your pump style, hose routing, and required hose length before ordering.
Compatible Applications
If you are converting, replacing, or refreshing a Verado Gen A/B hydraulic steering setup, confirm that 16ft hoses are the correct length for your boat layout.
What is Included
Recommended Damper Hose for Noise Reduction
The pressure-side fitting on this hose kit can connect directly into the Mercury Verado power steering pump. However, to help minimize steering system noise, it is recommended to install the Mercury damper hose between the pressure hose and the pump.
Recommended part: Mercury Verado Power Steering Damper Hose 897643A01 .
Related Verado Power Steering Parts
Shorter Verado Hose Kit
Need the shorter version of this Mercury Verado helm-to-power-steering-pump hose kit? Use 8M0078210 for the shorter hose option.
View Shorter Hose Kit
Verado Power Steering Damper Hose
Recommended between the pressure-side hose and the power steering pump to help reduce noise in Mercury Verado hydraulic steering systems.
View Damper Hose
Gen A/B Power Steering Pump Replacement
Replacement power steering pump option for Mercury Verado Generation A and Generation B hydraulic steering systems.
View Power Steering PumpWhat This Hose Kit is Used For
This Mercury Verado power steering hose kit connects the helm to the Generation A / Generation B power steering pump in a hydraulic Verado steering system. The kit includes both the pressure-side hose and the non-pressure return-side hose required for the helm-to-pump connection.
It is commonly used when replacing worn hoses, converting to a Gen A/B Verado pump setup, or completing a Mercury Verado hydraulic power steering repair.
Verado Power Steering Help
Mercury Verado Power Steering Walkthrough
Need help understanding Mercury Verado power steering pumps, hose routing, and Gen A/B steering system components? View our walkthrough for additional guidance before ordering.
View Verado Power Steering WalkthroughKey Features and Benefits
Includes both 16ft helm-to-pump hoses for pressure and non-pressure routing.
Designed for Mercury Verado systems using the Gen A / Gen B power steering pump style.
Pressure-side hose can connect directly to the pump, with damper hose recommended for noise reduction.
Useful for Verado power steering repairs, hose replacement, and Gen A/B pump conversion setups.
FAQ
What does this Mercury Verado hose kit include?
This kit includes a 16ft helm-to-power-steering-pump non-pressure hose and a 16ft helm-to-power-steering-pump pressure-side hose.
Does the pressure hose connect directly to the pump?
Yes, the pressure-side fitting can connect directly into the power steering pump. For noise reduction, Pro Marine recommends adding damper hose 897643A01 between the hose and pump.
What power steering pump does this hose kit work with?
This hose kit is intended for Mercury Verado hydraulic power steering systems using the Generation A / Generation B power steering pump style.
Is there a shorter version of this hose kit?
Yes. If you need the shorter Mercury Verado helm-to-pump hose kit, use 8M0078210.
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
8M0078213, Mercury 8M0078213, Verado power steering hose, Mercury Verado helm to pump hose, Gen A power steering hose, Gen B power steering hose, Verado hydraulic steering hose, 897643A01, 8M0078210, 8M0134736P, Mercury Verado power steering pump, Verado damper hose
Mercury Verado Gen A/B Power Steering Hose Kit 8M0078210
Mercury Verado hydraulic power steering hose kit 8M0078210 for Verado systems using the Generation A / Generation B power steering pump. This kit includes both 10ft helm-to-pump hoses: the non-pressure return hose and the pressure-side hose.
Important Application Note
This 10ft hose kit is for Mercury Verado hydraulic power steering systems that use the Generation A / Generation B style power steering pump. Always verify your pump style, hose routing, and required hose length before ordering.
Compatible Applications
If you are converting, replacing, or refreshing a Verado Gen A/B hydraulic steering setup, confirm that 10ft hoses are the correct length for your boat layout.
What is Included
Recommended Damper Hose for Noise Reduction
The pressure-side fitting on this hose kit can connect directly into the Mercury Verado power steering pump. However, to help minimize steering system noise, it is recommended to install the Mercury damper hose between the pressure hose and the pump.
Recommended part: Mercury Verado Power Steering Damper Hose 897643A01 .
Related Verado Power Steering Parts
Longer 16ft Verado Hose Kit
Need the longer version of this Mercury Verado helm-to-power-steering-pump hose kit? Use 8M0078213 for the 16ft hose option.
View 16ft Hose Kit
Verado Power Steering Damper Hose
Recommended between the pressure-side hose and the power steering pump to help reduce noise in Mercury Verado hydraulic steering systems.
View Damper Hose
Gen A/B Power Steering Pump Replacement
Replacement power steering pump option for Mercury Verado Generation A and Generation B hydraulic steering systems.
View Power Steering PumpWhat This Hose Kit is Used For
This Mercury Verado power steering hose kit connects the helm to the Generation A / Generation B power steering pump in a hydraulic Verado steering system. The kit includes both the pressure-side hose and the non-pressure return-side hose required for the helm-to-pump connection.
It is commonly used when replacing worn hoses, converting to a Gen A/B Verado pump setup, or completing a Mercury Verado hydraulic power steering repair where a 10ft hose length is required.
Verado Power Steering Help
Mercury Verado Power Steering Walkthrough
Need help understanding Mercury Verado power steering pumps, hose routing, and Gen A/B steering system components? View our walkthrough for additional guidance before ordering.
View Verado Power Steering WalkthroughKey Features and Benefits
Includes both 10ft helm-to-pump hoses for pressure and non-pressure routing.
Designed for Mercury Verado systems using the Gen A / Gen B power steering pump style.
Pressure-side hose can connect directly to the pump, with damper hose recommended for noise reduction.
Useful for Verado power steering repairs, hose replacement, and Gen A/B pump conversion setups.
FAQ
What does this Mercury Verado hose kit include?
This kit includes a 10ft helm-to-power-steering-pump non-pressure hose and a 10ft helm-to-power-steering-pump pressure-side hose.
Does the pressure hose connect directly to the pump?
Yes, the pressure-side fitting can connect directly into the power steering pump. For noise reduction, Pro Marine recommends adding damper hose 897643A01 between the hose and pump.
What power steering pump does this hose kit work with?
This hose kit is intended for Mercury Verado hydraulic power steering systems using the Generation A / Generation B power steering pump style.
Is there a longer version of this hose kit?
Yes. If you need the longer 16ft Mercury Verado helm-to-pump hose kit, use 8M0078213.
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
8M0078210, Mercury 8M0078210, Verado power steering hose, Mercury Verado helm to pump hose, Gen A power steering hose, Gen B power steering hose, Verado hydraulic steering hose, 897643A01, 8M0078213, 8M0134736P, Mercury Verado power steering pump, Verado damper hose, 10ft Verado hose kit
6 Cylinder
V6
135hp Optimax 2.5L
140hp Jet 2.5L
150hp Optimax 2.5L
175hp EFI 2.5L
175hp 2.5L Optimax
200hp 3.0L Optimax
134-645618
134645618
96455A18
96455T18
893371T20
893371T30
893371T10
6hp
8hp
9.9hp
10hp
15hp
18hp
20hp
25hp
98450A1
98450A10
98450A3
98450A5
OEM Mercury Racing 500R Thermostat Assembly
Mercury Thermostat Assembly 8M0210477 For 500R V8 Outboards
The Mercury 8M0210477 thermostat assembly is a genuine OEM Mercury Racing cooling system component used on Mercury Racing 500R 4.6L V8 FourStroke outboards.
This thermostat helps maintain proper engine operating temperature by regulating coolant flow through the engine cooling system. Replacing a worn or sticking thermostat helps maintain performance, fuel efficiency, and cooling system reliability.
Compatible Applications
| Engine Family | Horsepower | Engine Platform | Serial Number Range |
|---|---|---|---|
| Mercury Racing | 500R | 4.6L V8 FourStroke | 1E099432 & Newer |
Mercury thermostat assembly 8M0210477 fits Mercury Racing 500R 4.6L V8 FourStroke outboards with serial numbers 1E099432 and newer.
Always verify your engine serial number before ordering cooling system components.
Related Intake Hose Clamp
Mercury recommends replacing damaged hose clamps during cooling system service. The intake hose clamp kit below is commonly serviced along with thermostat-related repairs.
Mercury Intake Hose Clamp Kit
OEM Mercury clamp kit 888988008. Includes two intake hose clamps commonly serviced during cooling system maintenance and thermostat replacement.
View ProductOEM Part Numbers
| Brand | Part Number |
|---|---|
| Mercury Marine | 8M0210477 |
What This Thermostat Does
The thermostat regulates engine operating temperature by controlling the flow of cooling water through the engine.
A properly functioning thermostat helps the engine reach and maintain the correct operating temperature while protecting internal components from overheating.
Thermostats are commonly inspected and replaced during major scheduled maintenance intervals on high-performance Mercury Racing engines.
Key Features and Benefits
- Genuine OEM Mercury Racing thermostat assembly
- Fits Mercury Racing 500R 4.6L V8 outboards
- Fits serial number 1E099432 and newer
- 160° thermostat assembly
- Helps maintain proper engine operating temperature
- Supports cooling system efficiency and reliability
- Direct OEM replacement part
- Used during scheduled cooling system maintenance
Part Details
- Part Number: 8M0210477
- Product Type: Thermostat Assembly
- Brand: Mercury Marine
- Application: Mercury Racing 500R
- Engine: 4.6L V8 FourStroke
- Serial Range: 1E099432 & Newer
- OEM Mercury Part: Yes
FAQ
What engine does Mercury thermostat 8M0210477 fit?
This thermostat fits Mercury Racing 500R 4.6L V8 FourStroke outboards
with serial numbers 1E099432 and newer.
How many thermostats does a Mercury 500R use?
Mercury 500R engines using this application require one thermostat assembly.
What does a thermostat do?
The thermostat regulates engine operating temperature by controlling
cooling water flow through the engine.
Should I replace hose clamps during cooling system service?
Inspect hose clamps whenever servicing the cooling system. Replace damaged
or corroded clamps as needed.
Is this a genuine Mercury part?
Yes. This is an OEM Mercury Marine thermostat assembly.
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 cooling system components 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
8M0210477, Mercury 8M0210477, Mercury thermostat assembly, Mercury 500R thermostat, Mercury Racing thermostat, Mercury 500R cooling system, Mercury 500R thermostat replacement, Mercury 500R V8 thermostat, Mercury Racing 500R cooling parts, Mercury Racing cooling system, Mercury thermostat 1E099432, Mercury 500R maintenance, Mercury cooling system service, 888988008, Mercury intake hose clamp, Mercury thermostat housing, Mercury OEM thermostat