Standard Piston – Fits BRP/Evinrude/Johnson 40-55 HP (Replaces 435546)

$87.08

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Product Details

This is a high-quality aftermarket Standard Piston designed for BRP, Evinrude, and Johnson 40, 45, 48, 50, and 55 HP 2-Stroke outboard engines manufactured between 1994 and 2001. It serves as a reliable replacement for restoring engine compression and performance.

This component directly replaces OEM part number 435546 from BRP and Johnson/Evinrude.

Installation Location: Engine Powerhead
Housing Material: High-strength Aluminum Alloy
Design: Features a durable 2-ring piston design

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number
BRP	435546
Johnson/Evinrude	435546

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For BRP/Evinrude/Johnson engines, please verify your model falls within the specified horsepower and year range. Note any specific model details provided.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Johnson/Evinrude	Outboard	40	2-Stroke	1994–2001	435546	Freshwater application
Johnson/Evinrude	Outboard	45	2-Stroke	1994–2001	435546	Includes 45X model
Johnson/Evinrude	Outboard	48	2-Stroke	1994–2001	435546	Freshwater application
Johnson/Evinrude	Outboard	50	2-Stroke	1994–2001	435546	Model J50TSLECC 1998 confirmed
Johnson/Evinrude	Outboard	55	2-Stroke	1994–2001	435546	Freshwater application

Technical Specs

Product Type: Standard Piston
Installation: Engine Powerhead
Fuel Type: Gasoline
Housing Material: Aluminum Alloy
Housing Color: Silver
Dimensions: 8.5" H x 8.5" W x 8.5" L
Weight: 0.98 lbs (0.44 kg)
Other Technical Attributes: 2-ring piston design

What’s in the Box

1 x Piston Assembly, Standard (435546)
1 x Wrist Pin (322188)
2 x Retaining Rings/Circlips (317831)

Installation Notes

Disconnect the battery and ensure the fuel system is depressurized.
Drain engine coolant and oil to prevent spills.
Remove the cylinder head and gasket, exposing the pistons.
Carefully rotate the crankshaft to access the connecting rod of the target piston.
Remove the connecting rod cap and push the old piston assembly out from the top of the cylinder.
Install the new piston onto the connecting rod, checking for correct orientation marks.
Generously lubricate the new piston, rings, and cylinder bore with fresh engine oil.
Use a piston ring compressor to carefully guide the new piston assembly back into the cylinder.
Reinstall the connecting rod cap, torquing bolts to the manufacturer's specified values.
Reassemble the cylinder head with a new gasket and any other removed components.
Refill the engine with the correct type and amount of oil and coolant.
Before starting the engine, double-check all connections and look for any potential leaks.

Troubleshooting & FAQ

How do I know if this piston fits my specific engine model?

The best way is to match your original part number (435546) against our Part Number Matrix. Additionally, check your engine's horsepower and year against the "Engine & Model Compatibility" table. If your part number or model is not listed, this part may not fit.

What are the common signs of a failing piston?

Symptoms of a bad piston include loss of engine compression, excessive oil consumption, blue smoke from the exhaust, and a knocking or tapping sound from the engine block. Running a compression test is a definitive way to diagnose piston or ring failure.

Can I reuse my old piston rings, wrist pin, or circlips?

No. This kit includes a new wrist pin and circlips, and the piston is designed for a new set of rings. Reusing old components can lead to poor sealing, premature wear, and catastrophic engine failure. Always use all new components during installation.

What is the main difference between this and the OEM part?

This is an aftermarket part built to meet or exceed OEM specifications for fit, form, and function. It provides comparable performance and durability to the original at a better value. The primary difference is the manufacturer; it is not a genuine BRP/Evinrude/Johnson part.

Is there a break-in period for a new piston?

Yes. After installation, it's recommended to run the engine at varying, low-to-mid-range RPMs for the first few hours of operation. Avoid sustained high-RPMs or heavy loads. This allows the new piston rings to seat properly against the cylinder wall, ensuring a good seal and long engine life.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
This is an aftermarket replacement, not an OEM component.
Professional installation is recommended for safety and performance.

About Sea Sierra

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