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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.
Replacement Hydraulic Steering Cylinder
Pro Marine 350-HSTEER-CYL Hydraulic Steering Cylinder
The Pro Marine 350-HSTEER-CYL Hydraulic Steering Cylinder is the replacement steering cylinder used with the Pro Marine 350-HSTEER hydraulic steering system. It is designed for high-horsepower single outboard setups where smooth, controlled steering response is critical.
This is the cylinder only. Helm pump, hoses, steering fluid, and fill/bleed accessories are sold separately unless purchased as part of the complete 350-HSTEER system.
What This Cylinder Is Used For
The steering cylinder converts hydraulic pressure from the helm pump into side-to-side movement at the outboard engine. It is the component that physically moves the engine when you turn the steering wheel.
If your current cylinder is leaking, damaged, binding, or worn, replacing it can restore proper steering control and improve the overall feel of the system.
Read our 350-HSTEER Steering Comparison & Pro Tips Guide
Best Applications
| Application | Recommended Use |
|---|---|
| 350-HSTEER Systems | Replacement hydraulic steering cylinder |
| Single Outboards up to 350HP | High-horsepower hydraulic steering applications |
| Bass Boats | Responsive steering and control at speed |
| Bay Boats | Smooth steering in shallow and open water |
| Center Consoles | Reliable steering feel for offshore and coastal use |
Build or Service Your Steering System
Complete Steering Kit
Need the full system instead of just the cylinder? The complete kit includes the cylinder, helm pump, hydraulic fluid, and fill hose assembly.
View 350-HSTEER Complete KitHelm Pump
Pair this cylinder with the matching Pro Marine helm pump for proper hydraulic steering operation.
View 350-HELM-025 Helm PumpHydraulic Hoses
Select the correct hydraulic hose length for your boat, jack plate, setback, and rigging route.
Shop Pro Marine Hydraulic HosesFluid & Fill Hose
Hydraulic fluid and a fill hose assembly help make installation and bleeding easier during service.
View PRO-OIL15 Hydraulic FluidView 102P Fill Hose Assembly
Complete Your Steering Setup
Need additional Pro Marine steering components?
Key Features and Benefits
- Replacement hydraulic steering cylinder for 350-HSTEER systems
- Designed for high-horsepower single outboard steering applications
- Helps restore smooth steering movement and control
- Front-mount hydraulic steering cylinder design
- Works with hydraulic helm, hose, and fluid circuit
- Good option for service, repair, or steering system rebuilds
System Function and Connections
- System Type: Hydraulic outboard steering
- Component Type: Steering cylinder
- Connection Type: Hydraulic hose connections to helm circuit
- Typical Use: Single outboard applications up to 350HP when used with the proper system
- Related Components: Helm pump, hydraulic hoses, steering fluid, fittings, and fill/bleed tools
FAQ
Is this the complete steering system?
No. This listing is for the hydraulic steering cylinder only. The complete
system is available as the Pro Marine 350-HSTEER kit.
What system does this cylinder work with?
This cylinder is designed for use with the Pro Marine 350-HSTEER hydraulic
steering system.
Are hydraulic hoses included?
No. Hydraulic hoses are sold separately so you can choose the correct length
for your boat and rigging layout.
When should I replace a steering cylinder?
Replace the cylinder if it is leaking, damaged, binding, corroded, or no
longer holding proper steering control.
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-HSTEER-CYL, Pro Marine hydraulic steering cylinder, hydraulic steering cylinder, outboard steering cylinder, front mount steering cylinder, 350-HSTEER replacement cylinder, hydraulic steering repair, boat steering cylinder
