Piston Ring Set – Fits Yamaha 4HP 4-Stroke (Replaces 68D-E1603-00)
Piston Ring Set – Fits Yamaha 4HP 4-Stroke (Replaces 68D-E1603-00) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Product Details
This aftermarket Piston Ring Set is designed for Yamaha 4HP 4-Stroke outboard engines, including models F4A, MSHA-C, AMH, MLHB-S, MH, and MLHE manufactured between 2002 and 2009. It provides a reliable, standard-size (STD) replacement to restore compression and engine performance.
It serves as a direct replacement for Yamaha part numbers 68D-E1603-00 and AM68D-E1603-00, as well as Parsun F4-04020200.
- Installation: Mounts on the piston within the engine block/cylinder.
- Fuel Compatibility: Designed for gasoline engines.
- Specification: Standard Size (STD) for original bore cylinders.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 68D-E1603-00 | Primary OEM Reference |
| Yamaha | AM68D-E1603-00 | Alternative OEM Reference |
| Parsun | F4-04020200 | Aftermarket cross-reference. |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is confirmed to fit the following Yamaha 4HP four-stroke outboard models produced from 2002–2009.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F4A | 4 | 4-Stroke | 2002–2009 | 68D-E1603-00 | |
| Yamaha | MSHA-C | 4 | 4-Stroke | 2002–2009 | 68D-E1603-00 | |
| Yamaha | AMH | 4 | 4-Stroke | 2002–2009 | 68D-E1603-00 | |
| Yamaha | MLHB-S | 4 | 4-Stroke | 2002–2009 | 68D-E1603-00 | |
| Yamaha | MH | 4 | 4-Stroke | 2002–2009 | 68D-E1603-00 | |
| Yamaha | MLHE | 4 | 4-Stroke | 2002–2009 | 68D-E1603-00 | |
| Parsun | HDX Boat Motor | 4 | 4-Stroke | F4-04020200 |
Technical Specs
- Product Type
- Piston Ring Set
- Installation
- Engine Block/Cylinder
- Fuel Type
- Gasoline
- Dimensions
- 12.0cm L x 11.3cm W x 0.5cm H
- Other Technical Attributes
- Standard Size (STD)
What’s in the Box
- 3 x Piston Ring (68D-E1603-00)
Installation Notes
- Disconnect the battery and ignition system for safety.
- Drain the engine oil and coolant.
- Carefully remove the cylinder head and other components to access the piston.
- Use a ring expander to remove the old piston rings.
- Thoroughly clean all carbon deposits from the piston ring grooves.
- Fit the new rings onto the piston, ensuring correct sequence and orientation.
- Generously lubricate the piston, rings, and cylinder wall with fresh engine oil.
- Use a ring compressor tool to gently guide the piston assembly back into the cylinder.
- Reassemble all engine parts, torquing fasteners to the manufacturer's specifications.
- Refill the engine with the correct grade of oil and coolant before starting.
Troubleshooting & FAQ
How do I know if my piston rings need replacing?
Common signs of worn piston rings include excessive blue or white smoke from the exhaust, a noticeable loss of engine power, high oil consumption, and poor results from a compression test.
Is this a complete set for one piston?
Yes, this kit includes all three rings required for a single piston assembly (top compression ring, second compression ring, and oil control ring).
What does "Standard Size (STD)" mean?
Standard Size (STD) means these rings are designed for a cylinder bore that has not been machined or bored oversized. They fit the original factory cylinder diameter.
Will this fit a 2-stroke engine?
No, this piston ring set is specifically designed for the 4-stroke Yamaha models listed in the compatibility table and will not work in a 2-stroke engine.
Do I need special tools for installation?
Yes, professional installation is recommended. Specialized tools such as a piston ring expander (for removal) and a piston ring compressor (for installation) are required to avoid damaging the piston or rings.
What is the difference between OEM and aftermarket parts?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility, where it is batch-inspected for consistency.
How fast is shipping?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free, and expedited options are available at checkout where applicable.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If an issue arises, contact our support team with your order details. Returns are accepted within our standard window if the item is unused and in its original condition. Please see our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, not an OEM component.
- Professional installation is recommended for safety and optimal 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 quality control.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
