Sep 21, 2026
How to Find the Correct Outboard Motor Parts by OEM Part Number
Learn how to identify the correct Yamaha, Suzuki, Honda and Tohatsu outboard motor parts using OEM part numbers, engine models and serial numbers.
How to Find the Correct Outboard Motor Parts by OEM Part Number
Choosing the correct spare part for an outboard motor can sometimes be difficult. The same engine horsepower may use different parts depending on the model, production year, engine type, and serial number.
One of the safest ways to identify the correct replacement part is to check the OEM part number.
What Is an OEM Part Number?
An OEM part number is the identification number assigned to a specific component by the original engine manufacturer.
For example, Yamaha, Suzuki, Honda, and Tohatsu use different numbering systems for their outboard motor parts.
A customer may search for a part using information such as:
- Engine brand
- Horsepower
- Engine model
- Production year
- Serial number
- OEM part number
Among these, the OEM part number is usually one of the most useful references when confirming a replacement part.
Why Horsepower Alone Is Not Enough
It is common for customers to ask:
“Do you have a water pump for Yamaha 40HP?”
However, not every Yamaha 40HP engine uses exactly the same water pump, gasket, gear, CDI unit, or other component.
Different engine series may have different specifications.
For example, two outboard motors may both be rated at 40HP but use different:
- Impellers
- Water pump repair kits
- Gasket sets
- Pistons
- Gear sets
- Drive shafts
- CDI units
- Ignition coils
- Oil seals
This is why checking the engine model and OEM number before ordering is important.
Where Can You Find the Part Number?
The OEM number can often be found in several places.
1. On the Original Part
Many outboard components have a number printed, stamped, engraved, or molded directly onto the part.
Electrical parts such as CDI units and ignition coils often have identification numbers on their labels.
2. In the Outboard Parts Catalog
Engine manufacturers provide exploded parts diagrams for different engine models.
These diagrams normally show:
- Component name
- Item position
- OEM part number
- Quantity required
Using the engine model together with the parts diagram is one of the best ways to identify the correct part.
3. On the Engine Identification Plate
The engine model and serial number are normally shown on the outboard motor identification plate.
This information can help suppliers confirm which parts are suitable for the engine.
Information to Send Your Supplier
When requesting an outboard motor spare part, providing more information can greatly reduce mistakes.
We recommend sending:
Engine Brand: Yamaha / Suzuki / Honda / Tohatsu
Horsepower: For example, 15HP or 40HP
Engine Model: If available
OEM Part Number: If known
Production Year: If available
Serial Number: When necessary
Part Photos: Especially useful for older engines
For some parts, a clear photo of the old component can also help confirm the correct version.
Common Outboard Parts That Should Be Checked Carefully
Some components have many similar versions and should always be confirmed before ordering.
These include:
Water Pump Impellers
Impellers may look very similar but have different diameters, heights, shaft hole sizes, and blade designs.
Propellers
When selecting a propeller, you should check more than the engine horsepower.
Important specifications include:
- Diameter
- Pitch
- Number of blades
- Spline count
- Rotation
- Engine model
- Gearcase size
CDI Units and Ignition Components
CDI units, ignition coils, and charge coils may have similar appearances but different electrical specifications.
Using the correct OEM number is especially important.
Gear Sets
Forward gears, reverse gears, and pinion gears must match the correct gearbox and engine series.
Even small dimensional differences can prevent proper installation.
Gaskets and Oil Seals
Gaskets and seals are often inexpensive parts, but using the wrong size can cause oil leakage, water leakage, compression problems, or other engine issues.
Replacement Parts vs. Genuine Parts
When searching by OEM number, customers may find both genuine and aftermarket replacement parts.
Genuine parts are supplied under the original engine manufacturer's brand.
Aftermarket replacement parts are produced by independent manufacturers and are designed to replace the corresponding OEM component.
For replacement parts, quality can vary significantly between suppliers.
Before ordering, buyers should consider:
- Material quality
- Dimensions and tolerances
- Manufacturing consistency
- Fitment
- Packaging
- Supplier experience
For distributors and repair shops purchasing larger quantities, sample testing before a large order can also be useful.
Why Part Number Confirmation Matters for Wholesale Orders
For a single repair, ordering the wrong part causes inconvenience.
For a wholesale order of 100, 500, or 1,000 pieces, a fitment mistake can become a much larger problem.
This is why professional buyers normally confirm the OEM number before placing bulk orders.
For mixed orders containing many different outboard motor parts, preparing a list with part numbers and quantities can also make quotation and order confirmation much faster.
Need Help Finding the Correct Outboard Part?
We supply a wide range of replacement parts for Yamaha, Suzuki, Honda, and Tohatsu outboard motors, including:
- Propellers
- Water pump impellers
- Water pump repair kits
- Fuel line assemblies
- Gasket sets
- Piston kits
- Gear sets
- Drive shafts
- CDI units
- Ignition coils
- Charge coils
- Crankshafts
- Connecting rods
- Oil seals
- Bearings
- Lower unit parts
If you are unsure which part is suitable for your engine, send us the OEM part number, engine model, horsepower, and product photo.
For distributors, marine repair shops, and wholesalers, mixed-part-number orders are also welcome.
Contact us for availability and quotation.
