Piston Kit .030 Oversize – Fits Johnson/Evinrude 9.9-15 HP 2-Cylinder Outboards (Replaces 5006662, 0396574)

$59.99 $95.00

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Product Details

This is a high-quality aftermarket Piston Kit .030 Oversize designed for Johnson/Evinrude 9.9–15 HP, 2-stroke, 2-cylinder cross-flow outboard engines manufactured between 1974 and 1992. It serves as a direct-fit replacement for worn or damaged pistons, restoring compression and engine performance.

This kit provides a comprehensive interchange solution, replacing OEM part numbers Johnson/Evinrude 5006662, 0396574, 0396652, and 0391454, as well as aftermarket equivalents like GLM 24430 and Sierra 18-3933.

Engineered for a precise .030" oversize bore.
Constructed from durable aluminum alloy for longevity in marine environments.
Kit includes all essential components for a single-piston replacement.

Part Number Matrix

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

Brand	Part Number
Johnson/Evinrude	5006662
Johnson/Evinrude	0396574
Johnson/Evinrude	0396652
Johnson/Evinrude	0391454
GLM	24430
Sierra	18-3933

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This piston kit is compatible with a wide range of Johnson and Evinrude 9.9 HP and 15 HP models produced from the mid-1970s through the early 1990s.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Johnson	J10ECCD, J10ECDB, J10ECES	9.9	2-Stroke	1986–1989	5006662	Cross flow engine
Johnson	J10ECSE, J10ECUE	9.9	2-Stroke	1980–1987	5006662	Cross flow engine
Johnson	J10EEIR, J10EENA, J10EESC	9.9	2-Stroke	1990–1992	5006662	Cross flow engine
Johnson	J10ELCCD, J10ELCDB, J10ELCES	9.9	2-Stroke	1986–1989	5006662	Cross flow engine
Johnson	J10ELCID, J10ELCNS	9.9	2-Stroke	1981–1982	5006662	Cross flow engine
Johnson	J10ELCOM, J10ELCRA	9.9	2-Stroke	1984–1985	5006662	Cross flow engine
Johnson	J10ELCSE, J10ELCTC, J10ELCUE	9.9	2-Stroke	1980–1987	5006662	Cross flow engine
Johnson	J10ELEIR, J10ELENA, J10ELESC	9.9	2-Stroke	1990–1992	5006662	Cross flow engine
Johnson	J15ECCS, J15ECDE, J15ECEC	15	2-Stroke	1986–1989	5006662	Cross flow engine
Johnson	J15ECIS, J15ECNC	15	2-Stroke	1981–1982	5006662	Cross flow engine
Johnson	J15ECOB, J15ECRM	15	2-Stroke	1984–1985	5006662	Cross flow engine
Johnson	J15ECSD, J15ECTR, J15ECUD	15	2-Stroke	1980–1987	5006662	Cross flow engine
Johnson	J15EEIA, J15EENM, J15EESR	15	2-Stroke	1990–1992	5006662	Cross flow engine
Evinrude	E10ECCD, E10ECDB, E10ECES	9.9	2-Stroke	1986–1989	5006662	Cross flow engine
Evinrude	E10ECSE, E10ECUE	9.9	2-Stroke	1980–1987	5006662	Cross flow engine
Evinrude	E10EEIR, E10EENA, E10EESC	9.9	2-Stroke	1990–1992	5006662	Cross flow engine
Evinrude	E10ELCCD, E10ELCDB, E10ELCES	9.9	2-Stroke	1986–1989	5006662	Cross flow engine
Evinrude	E10ELCID, E10ELCNS	9.9	2-Stroke	1981–1982	5006662	Cross flow engine
Evinrude	E10ELCOM, E10ELCRA	9.9	2-Stroke	1984–1985	5006662	Cross flow engine
Evinrude	E10ELCSE, E10ELCTC, E10ELCUE	9.9	2-Stroke	1980–1987	5006662	Cross flow engine
Evinrude	E10ELEIR, E10ELENA, E10ELESC	9.9	2-Stroke	1990–1992	5006662	Cross flow engine
Evinrude	E15ECCS, E15ECDE, E15ECEC	15	2-Stroke	1986–1989	5006662	Cross flow engine
Evinrude	E15ECIS, E15ECNC	15	2-Stroke	1981–1982	5006662	Cross flow engine
Evinrude	E15ECOB, E15ECRM	15	2-Stroke	1984–1985	5006662	Cross flow engine
Evinrude	E15ECSD, E15ECTR, E15ECUD	15	2-Stroke	1980–1987	5006662	Cross flow engine
Evinrude	E15EEIA, E15EENM, E15EESR	15	2-Stroke	1990–1992	5006662	Cross flow engine
Johnson	10424G, 10424S, 10425G, 10425S	9.9	2-Stroke	1974	0396574	Earlier model
Johnson	10454G, 10454S, 10455G, 10455S	9.9	2-Stroke	1974	0396574	Earlier model
Johnson	10524C, 10525C, 10554C, 10555C	9.9	2-Stroke	1975	0396574	Earlier model
Johnson	15404G, 15404S, 15405G, 15405S	15	2-Stroke	1974	0396574	Earlier model
Johnson	15454G, 15454S, 15455G, 15455S	15	2-Stroke	1974	0396574	Earlier model
Johnson	15504C, 15505C, 15554C, 15555C	15	2-Stroke	1975	0396574	Earlier model

Technical Specs

Product Type: Piston Kit (.030 Oversize)
Piston Diameter: 2.218 in (56.34 mm)
Original Bore Size: 2.188 in (55.58 mm)
Piston Height: 10.5 cm
Wrist Pin Diameter: 14.20 mm (0.559 in)
Housing Material: Aluminum Alloy
Product Weight: 0.25 kg (0.55 lb)
Product Dimensions: 10.5 cm (L) x 10.0 cm (W) x 10.5 cm (H)
Warranty: 1 Year (varies by manufacturer)

What’s in the Box

1 x Piston (.030 Oversize) (Replaces 5006662/0396574)
1 x Ring Set
2 x Circlips/Wrist Pin Clips
1 x Wrist Pin

Installation Notes

Disconnect the battery and spark plug wires for safety. Drain engine oil and coolant.
Remove the cylinder head and any components obstructing access to the pistons.
Carefully remove the old piston, connecting rod, and associated clips and bearings.
Thoroughly clean the cylinder walls, crankshaft, and connecting rod. Inspect for any damage.
Ensure the cylinder is correctly bored and honed to match the .030" oversize piston.
Install the new piston rings onto the new piston, ensuring correct orientation.
Lubricate the new piston, rings, wrist pin, and cylinder wall with fresh 2-stroke engine oil.
Install the new piston onto the connecting rod with the new wrist pin and secure it with the new clips.
Carefully guide the piston and ring assembly into the cylinder using a ring compressor tool.
Reassemble the engine components in reverse order, torquing all bolts to manufacturer specifications.
Refill engine fluids, reconnect the battery and spark plugs, and perform a break-in procedure as recommended by your engine's service manual.

Troubleshooting & FAQ

How do I know if I need an oversize piston?

An oversize piston is required when the cylinder wall has been worn or damaged and must be machined (bored) to a larger diameter. This should only be determined after a qualified marine mechanic measures the cylinder bore for wear, taper, and out-of-round conditions.

Is this kit for one or two cylinders?

This kit contains components for one cylinder. If you are rebuilding a 2-cylinder engine, you will need to purchase two kits.

What are the signs of a failing piston?

Common symptoms include low compression in one or more cylinders, excessive smoke from the exhaust, a knocking or rattling sound from the engine (piston slap), and a noticeable loss of power.

Do I need a special tool to install the piston rings?

Yes, it is highly recommended to use a piston ring expander tool to install the rings onto the piston and a piston ring compressor tool to guide the piston assembly into the cylinder. Using incorrect tools can easily break the new rings or damage the piston.

Is honing the cylinder necessary before installing?

Absolutely. After boring the cylinder to the .030" oversize dimension, it must be honed to create the proper cross-hatch pattern on the cylinder wall. This pattern is critical for seating the new rings and ensuring proper lubrication.

What is the break-in procedure for a new piston?

Follow the specific break-in procedure outlined in your outboard's official service manual. Generally, it involves running the engine at varying, low-to-mid RPMs for several hours without sustained full-throttle operation to allow the new rings to seat correctly against the cylinder wall.

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

Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.

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