Piston Kit – Fits Suzuki DT40/DT40C 40HP Outboard (Replaces 12110-94400)
Piston Kit – Fits Suzuki DT40/DT40C 40HP Outboard (Replaces 12110-94400) is backordered and will ship as soon as it is back in stock.
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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
Piston Kit – Fits Suzuki DT40/DT40C 40HP Outboard (Replaces 12110-9...
Product Details
This Piston Kit – Fits Suzuki DT40/DT40C 40HP Outboard is engineered for Suzuki 2-Stroke 35–40HP outboard motors from years 1986–2004. It is designed for a precise fit on DT40C-W-G-X (1986–1999) and DT40W-K1-K4 (2001–2004) models, ensuring reliable engine performance.
It serves as a direct aftermarket replacement, referencing Suzuki OEM part numbers 12110-94400, 12110-94400-000, and 12110-94400K.
- Installation: Designed for direct replacement with no modifications required.
- Material: Constructed from a high silicon content aluminum alloy for superior durability and heat resistance.
- Design: Features a wear-resistant piston ring design to ensure optimal compression and a long service life.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Suzuki | 12110-94400 |
| Suzuki | 12110-94400-000 |
| Suzuki | 12110-94400K |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
The following table lists compatible Suzuki outboard models for this piston kit.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Suzuki | DT40C-W-G-X | 40 | 2-Stroke | 1986–1999 | 12110-94400 | |
| Suzuki | DT40W-K1-K4 | 40 | 2-Stroke | 2001–2004 | 12110-94400 | |
| Suzuki | DT40 | 40 | 2-Stroke | 1984–1998 | 12110-94400K | |
| Suzuki | DT35 | 35 | 2-Stroke | 1986–1999 | 12110-94400 | Compatibility implied by part number |
Technical Specs
- Product Type
- Piston Kit
- Installation
- Direct replacement
- Fuel Type
- Gasoline (2-stroke)
- Housing Material
- High silicon content aluminum alloy
- Dimensions
- 79mm diameter
- Fitting Type
- Standard size
- Other Technical Attributes
- Wear-resistant piston ring design
What’s in the Box
- 1 x Piston (12110-94400)
- 1 x Piston Pin (12151-94400)
- 2 x Clip (1 set)
- 2 x Piston Ring (1 set)
Installation Notes
- Ensure the engine is off and cool, and disconnect the battery.
- Remove the engine cover and cylinder head according to your service manual.
- Carefully extract the old piston, piston pin, and associated rings.
- Thoroughly clean the cylinder walls and inspect for wear, scoring, or damage.
- Install the new piston rings onto the new piston, ensuring they are correctly oriented.
- Generously lubricate the new piston, rings, and cylinder wall with fresh 2-stroke oil.
- Install the new piston assembly with the piston pin, securing it with the provided clips.
- Reinstall the cylinder head, torquing all fasteners to the manufacturer's specified values.
- Reconnect the battery and perform a test run, following proper engine break-in procedures.
Troubleshooting & FAQ
How do I know if this piston kit will fit my engine?
Verify your engine model and year against the "Engine & Model Compatibility" table. It is also crucial to cross-reference your existing part number with the equivalents listed in our "Part Number Matrix." If there is any doubt, check the physical specifications against your old part.
What are signs that my old piston needs replacement?
Common signs of a failing piston include a noticeable loss of engine compression, excessive blue or white smoke from the exhaust, a knocking or rattling sound from the engine block, and a general reduction in performance and power output.
Is a break-in period required after installing this new piston?
Yes, a proper break-in period is critical. For the first 5-10 hours of operation, avoid running the engine at a constant RPM or at full throttle for extended periods. Varying the engine speed helps the new rings seat correctly against the cylinder wall for optimal compression.
Do I need to replace the piston rings at the same time?
Yes, absolutely. This kit includes a full set of new piston rings. Rings should always be replaced along with the piston to ensure proper sealing and to restore engine compression to factory specifications. Never reuse old rings with a new piston.
What is the difference between this and an OEM part?
This is an aftermarket part designed to meet or exceed OEM specifications using comparable high-grade materials. It offers a cost-effective alternative without compromising on performance or durability.
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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