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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.
25cc Hydraulic Steering Helm Pump
Pro Marine 350-HELM-025 Hydraulic Helm Pump
The Pro Marine 350-HELM-025 Hydraulic Helm Pump is a 25cc hydraulic steering helm designed for smooth, controlled steering response on modern outboard boats.
This helm is compatible with many standard hydraulic steering systems, including Pro Marine, SeaStar®, Uflex®, and other similar front-mount hydraulic steering setups.
What a Hydraulic Helm Pump Does
The helm pump is the core component of a hydraulic steering system. When the steering wheel is turned, the helm creates hydraulic pressure that moves fluid through the hoses and steering cylinder to turn the engine.
A properly matched helm pump helps provide predictable steering feel, reduced steering effort, and smooth handling at both low and high speeds.
Read our Hydraulic Steering Comparison & Pro Tips Guide
Best Applications
| Application | Recommended Use |
|---|---|
| Single Outboards up to 350HP | Hydraulic steering helm applications |
| Bass Boats | Performance steering and responsive handling |
| Bay Boats | Smooth low-speed and cruising control |
| Center Consoles | Reliable offshore and coastal steering feel |
| Repower Projects | Excellent upgrade from traditional cable steering |
Complete or Service Your Steering System
Complete Steering Kit
Need the full steering package? The 350-HSTEER kit includes the helm, cylinder, fluid, and fill hose assembly.
View 350-HSTEER Complete KitSteering Cylinder
This helm works with many standard hydraulic steering cylinders, including Pro Marine, SeaStar®, and Uflex® compatible systems.
View 350-HSTEER-CYL CylinderHydraulic Hoses
Select the proper hydraulic hose length for your boat, jack plate, setback, and rigging route.
Shop Pro Marine Hydraulic HosesFluid & Fill Accessories
Hydraulic fluid and fill hose assemblies help simplify installation and steering system bleeding.
View PRO-OIL15 Hydraulic FluidView 102P Fill Hose Assembly
Key Features and Benefits
- 25cc hydraulic helm pump design
- Compatible with many standard hydraulic steering systems
- Works with Pro Marine, SeaStar®, and Uflex® style setups
- Smooth steering response and controlled handling
- Designed for high-horsepower single outboards
- Helps reduce steering effort compared to cable steering
- Good option for bass boats, bay boats, and offshore applications
System Function and Connections
- System Type: Hydraulic outboard steering
- Component Type: Hydraulic helm pump
- Helm Size: 25cc
- Connection Type: Hydraulic steering hose circuit
- Typical Use: Single outboard hydraulic steering systems
- Compatible Systems: Pro Marine, SeaStar®, Uflex®, and similar front-mount hydraulic steering systems
- Related Components: Steering cylinder, hydraulic hoses, steering fluid, fittings, and fill/bleed kit
FAQ
What does a hydraulic helm pump do?
The helm pump converts steering wheel movement into hydraulic pressure that moves the steering cylinder.
What size is this helm?
This is a 25cc hydraulic helm pump.
What steering systems is this helm compatible with?
It is compatible with many standard hydraulic steering systems including Pro Marine, SeaStar®, Uflex®, and other similar front-mount hydraulic steering setups.
Is this the complete steering system?
No. This listing is for the helm pump only.
Can I buy the complete steering kit instead?
Yes. The complete 350-HSTEER kit includes the helm pump, steering cylinder, fluid, and fill hose 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.
- 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
350-HELM-025, hydraulic helm pump, 25cc helm, SeaStar compatible helm, Uflex compatible helm, Pro Marine helm pump, hydraulic steering helm, outboard steering helm, front mount hydraulic steering
37cc Hydraulic Steering Helm Pump
Pro Marine 350-HELM-037 Hydraulic Helm Pump
The Pro Marine 350-HELM-037 Hydraulic Helm Pump is a 37cc hydraulic steering helm designed for smooth, responsive steering control on high-horsepower outboard boats.
This Pro Marine helm is designed for the 350-HSTEER system and is compatible with many standard hydraulic steering systems, including Pro Marine, SeaStar®, Uflex®, and other similar front-mount hydraulic steering setups.
What a 37cc Helm Pump Does
The helm pump creates the hydraulic pressure that moves fluid through the steering hoses and into the steering cylinder. When you turn the wheel, the helm controls how much fluid is moved through the system, which directly affects steering feel and wheel turns lock-to-lock.
A 37cc helm moves more fluid per steering wheel turn than smaller 25cc or 30cc helms, which can create quicker steering response and fewer turns lock-to-lock when matched with the correct hydraulic steering cylinder.
Read our Hydraulic Steering Comparison & Pro Tips Guide
Best Applications
| Application | Recommended Use |
|---|---|
| Single Outboards up to 350HP | Hydraulic steering helm applications requiring quicker response |
| Bass Boats | Performance steering feel and reduced wheel turns |
| Bay Boats | Responsive control for shallow-water and open-water use |
| Center Consoles | Controlled steering feel for coastal and offshore running |
| Performance Setups | Useful where faster steering response is preferred |
Complete or Service Your Steering System
Complete Steering Kit
Need a complete hydraulic steering package? The 350-HSTEER kit includes the steering cylinder, helm pump, hydraulic fluid, and fill hose assembly.
View 350-HSTEER Complete KitSteering Cylinder
Pair this helm with a compatible hydraulic steering cylinder for proper system operation and steering response.
View 350-HSTEER-CYL CylinderHydraulic Hoses
Choose the correct hose length for your boat, jack plate, setback, and rigging route.
Shop Pro Marine Hydraulic HosesFluid & Fill Accessories
Hydraulic steering fluid and fill hose assemblies help simplify installation, filling, and bleeding.
View PRO-OIL15 Hydraulic FluidView 102P Fill Hose Assembly
Key Features and Benefits
- 37cc hydraulic helm pump design
- 2.25 cubic inches per revolution hydraulic displacement
- Moves more fluid per wheel turn than 25cc and 30cc helms
- Can provide quicker steering response when properly matched
- Designed for the Pro Marine 350-HSTEER hydraulic steering system
- Compatible with many standard hydraulic steering systems
- Works with Pro Marine, SeaStar®, and Uflex® style setups
- Good choice for performance boats and high-horsepower outboards
- Helps reduce steering effort compared to cable steering
System Function and Connections
- System Type: Hydraulic outboard steering
- Component Type: Hydraulic helm pump
- Helm Size: 37cc
- Displacement: 2.25 cu in/rev
- Connection Type: Hydraulic steering hose circuit
- Typical Use: Single outboard hydraulic steering systems
- Compatible Systems: Pro Marine 350-HSTEER, SeaStar®, Uflex®, and similar front-mount hydraulic steering systems
- Related Components: Steering cylinder, hydraulic hoses, steering fluid, fittings, and fill/bleed kit
FAQ
What does a 37cc hydraulic helm pump do?
It converts steering wheel movement into hydraulic pressure and moves fluid through the steering system to turn the outboard.
What is the difference between a 30cc and 37cc helm?
A 37cc helm moves more fluid per wheel turn than a 30cc helm, which can reduce turns lock-to-lock and create a quicker steering feel when matched correctly.
What steering systems is this helm compatible with?
It is designed for the Pro Marine 350-HSTEER system and is compatible with many standard hydraulic steering systems including Pro Marine, SeaStar®, Uflex®, and other similar front-mount hydraulic steering setups.
Is this the complete steering system?
No. This listing is for the helm pump only.
Should I choose the 30cc or 37cc helm?
Choose based on your steering cylinder, boat setup, and desired steering feel. The 37cc helm is generally the more responsive option.
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.
- 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
350-HELM-037, hydraulic helm pump, 37cc helm pump, Pro Marine 37cc helm, 2.25 cu in helm pump, SeaStar compatible helm, Uflex compatible helm, hydraulic steering helm, outboard steering helm, performance steering helm, 350-HSTEER helm pump
37cc Hydraulic Steering Helm Pump
Pro Marine 350-HELM-037 Hydraulic Helm Pump
The Pro Marine 350-HELM-037 Hydraulic Helm Pump is a 37cc hydraulic steering helm designed for smooth, responsive steering control on high-horsepower outboard boats.
This Pro Marine helm is designed for the 350-HSTEER system and is compatible with many standard hydraulic steering systems, including Pro Marine, SeaStar®, Uflex®, and other similar front-mount hydraulic steering setups.
What a 37cc Helm Pump Does
The helm pump creates the hydraulic pressure that moves fluid through the steering hoses and into the steering cylinder. When you turn the wheel, the helm controls how much fluid is moved through the system, which directly affects steering feel and wheel turns lock-to-lock.
A 37cc helm moves more fluid per steering wheel turn than smaller 25cc or 30cc helms, which can create quicker steering response and fewer turns lock-to-lock when matched with the correct hydraulic steering cylinder.
Read our Hydraulic Steering Comparison & Pro Tips Guide
Best Applications
| Application | Recommended Use |
|---|---|
| Single Outboards up to 350HP | Hydraulic steering helm applications requiring quicker response |
| Bass Boats | Performance steering feel and reduced wheel turns |
| Bay Boats | Responsive control for shallow-water and open-water use |
| Center Consoles | Controlled steering feel for coastal and offshore running |
| Performance Setups | Useful where faster steering response is preferred |
Complete or Service Your Steering System
Complete Steering Kit
Need a complete hydraulic steering package? The 350-HSTEER kit includes the steering cylinder, helm pump, hydraulic fluid, and fill hose assembly.
View 350-HSTEER Complete KitSteering Cylinder
Pair this helm with a compatible hydraulic steering cylinder for proper system operation and steering response.
View 350-HSTEER-CYL CylinderHydraulic Hoses
Choose the correct hose length for your boat, jack plate, setback, and rigging route.
Shop Pro Marine Hydraulic HosesFluid & Fill Accessories
Hydraulic steering fluid and fill hose assemblies help simplify installation, filling, and bleeding.
View PRO-OIL15 Hydraulic FluidView 102P Fill Hose Assembly
Key Features and Benefits
- 37cc hydraulic helm pump design
- 2.25 cubic inches per revolution hydraulic displacement
- Moves more fluid per wheel turn than 25cc and 30cc helms
- Can provide quicker steering response when properly matched
- Designed for the Pro Marine 350-HSTEER hydraulic steering system
- Compatible with many standard hydraulic steering systems
- Works with Pro Marine, SeaStar®, and Uflex® style setups
- Good choice for performance boats and high-horsepower outboards
- Helps reduce steering effort compared to cable steering
System Function and Connections
- System Type: Hydraulic outboard steering
- Component Type: Hydraulic helm pump
- Helm Size: 37cc
- Displacement: 2.25 cu in/rev
- Connection Type: Hydraulic steering hose circuit
- Typical Use: Single outboard hydraulic steering systems
- Compatible Systems: Pro Marine 350-HSTEER, SeaStar®, Uflex®, and similar front-mount hydraulic steering systems
- Related Components: Steering cylinder, hydraulic hoses, steering fluid, fittings, and fill/bleed kit
FAQ
What does a 37cc hydraulic helm pump do?
It converts steering wheel movement into hydraulic pressure and moves fluid through the steering system to turn the outboard.
What is the difference between a 30cc and 37cc helm?
A 37cc helm moves more fluid per wheel turn than a 30cc helm, which can reduce turns lock-to-lock and create a quicker steering feel when matched correctly.
What steering systems is this helm compatible with?
It is designed for the Pro Marine 350-HSTEER system and is compatible with many standard hydraulic steering systems including Pro Marine, SeaStar®, Uflex®, and other similar front-mount hydraulic steering setups.
Is this the complete steering system?
No. This listing is for the helm pump only.
Should I choose the 30cc or 37cc helm?
Choose based on your steering cylinder, boat setup, and desired steering feel. The 37cc helm is generally the more responsive option.
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.
- 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
350-HELM-037, hydraulic helm pump, 37cc helm pump, Pro Marine 37cc helm, 2.25 cu in helm pump, SeaStar compatible helm, Uflex compatible helm, hydraulic steering helm, outboard steering helm, performance steering helm, 350-HSTEER helm pump
44cc Hydraulic Steering Helm Pump
Pro Marine 350-HELM-044 Hydraulic Helm Pump
The Pro Marine 350-HELM-044 Hydraulic Helm Pump is a 44cc hydraulic steering helm designed for fast, responsive steering control on high-horsepower outboard boats.
This Pro Marine helm is designed for the 350-HSTEER system and is compatible with many standard hydraulic steering systems, including Pro Marine, SeaStar®, Uflex®, and other similar front-mount hydraulic steering setups.
What a 44cc Helm Pump Does
The helm pump creates the hydraulic pressure that moves fluid through the steering hoses and into the steering cylinder. When you turn the wheel, the helm controls how much fluid is moved through the system, which directly affects steering feel and wheel turns lock-to-lock.
A 44cc helm moves more fluid per steering wheel turn than smaller 25cc, 30cc, or 37cc helms, which can create the quickest steering response and fewer turns lock-to-lock when matched with the correct hydraulic steering cylinder.
Read our Hydraulic Steering Comparison & Pro Tips Guide
Best Applications
| Application | Recommended Use |
|---|---|
| Single Outboards up to 350HP | Hydraulic steering helm applications requiring very quick response |
| Bass Boats | Performance steering feel and reduced wheel turns |
| Bay Boats | Fast steering response for shallow-water and open-water use |
| Center Consoles | Responsive steering feel for coastal and offshore running |
| Performance Setups | Useful where faster steering response and fewer turns are preferred |
Complete or Service Your Steering System
Complete Steering Kit
Need a complete hydraulic steering package? The 350-HSTEER kit includes the steering cylinder, helm pump, hydraulic fluid, and fill hose assembly.
View 350-HSTEER Complete KitSteering Cylinder
Pair this helm with a compatible hydraulic steering cylinder for proper system operation and steering response.
View 350-HSTEER-CYL CylinderHydraulic Hoses
Choose the correct hose length for your boat, jack plate, setback, and rigging route.
Shop Pro Marine Hydraulic HosesFluid & Fill Accessories
Hydraulic steering fluid and fill hose assemblies help simplify installation, filling, and bleeding.
View PRO-OIL15 Hydraulic FluidView 102P Fill Hose Assembly
Key Features and Benefits
- 44cc hydraulic helm pump design
- 2.68 cubic inches per revolution hydraulic displacement
- Moves more fluid per wheel turn than 25cc, 30cc, and 37cc helms
- Can provide very quick steering response when properly matched
- Designed for the Pro Marine 350-HSTEER hydraulic steering system
- Compatible with many standard hydraulic steering systems
- Works with Pro Marine, SeaStar®, and Uflex® style setups
- Good choice for performance boats and high-horsepower outboards
- Helps reduce steering effort compared to cable steering
System Function and Connections
- System Type: Hydraulic outboard steering
- Component Type: Hydraulic helm pump
- Helm Size: 44cc
- Displacement: 2.68 cu in/rev
- Connection Type: Hydraulic steering hose circuit
- Typical Use: Single outboard hydraulic steering systems
- Compatible Systems: Pro Marine 350-HSTEER, SeaStar®, Uflex®, and similar front-mount hydraulic steering systems
- Related Components: Steering cylinder, hydraulic hoses, steering fluid, fittings, and fill/bleed kit
FAQ
What does a 44cc hydraulic helm pump do?
It converts steering wheel movement into hydraulic pressure and moves fluid through the steering system to turn the outboard.
What is the difference between a 37cc and 44cc helm?
A 44cc helm moves more fluid per wheel turn than a 37cc helm, which can reduce turns lock-to-lock and create a quicker steering feel when matched correctly.
What steering systems is this helm compatible with?
It is designed for the Pro Marine 350-HSTEER system and is compatible with many standard hydraulic steering systems including Pro Marine, SeaStar®, Uflex®, and other similar front-mount hydraulic steering setups.
Is this the complete steering system?
No. This listing is for the helm pump only.
Should I choose the 37cc or 44cc helm?
Choose based on your steering cylinder, boat setup, and desired steering feel. The 44cc helm is generally the more responsive option.
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.
- 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
350-HELM-044, hydraulic helm pump, 44cc helm pump, Pro Marine 44cc helm, 2.68 cu in helm pump, SeaStar compatible helm, Uflex compatible helm, hydraulic steering helm, outboard steering helm, performance steering helm, 350-HSTEER helm pump
