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Fuel Injector Assembly – Fits Honda BF40D/BF50D 40-50HP Outboard Engines (Replaces 16450-ZZ5-003)
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Fuel Injector Assembly – Fits Honda BF40D/BF50D 40-50HP Outboard Engines (Replaces 16450-ZZ5-003)
This fuel injector assembly is engineered for Honda Marine 40-50HP, 4-stroke BF40D and BF50D series outboard engines. It provides a reliable, direct replacement for original equipment, ensuring proper fuel delivery and engine performance.
This part is a direct cross-reference for Honda OEM part 16450-ZZ5-003 and aftermarket parts from JESBEN (16450ZZ5003) and KEIITYEN (16450-ZZ5-003). Each injector is flow-matched to OEM standards and fully tested for internal coil resistance and fuel flow rates.
- Installation Type: Direct OEM replacement
- Compatible Fuel: Gasoline
- Key Feature: 6-hole injector nozzle for precise fuel atomization
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Honda | 16450-ZZ5-003 |
| JESBEN | 16450ZZ5003 |
| KEIITYEN | 16450-ZZ5-003 |
Compatible Engine Models
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Honda | BF40D LHA | 40 | 4-Stroke | 16450-ZZ5-003 | BBDJ-1000001 - BBDJ-9999999 |
| Honda | BF40D LRTA | 40 | 4-Stroke | 16450-ZZ5-003 | BBDJ-1000001 - BBDJ-9999999 |
| Honda | BF40DK2 LHA | 40 | 4-Stroke | 16450-ZZ5-003 | BBDJ-1100001 - BBDJ-9999999 |
| Honda | BF40DK2 LRTA | 40 | 4-Stroke | 16450-ZZ5-003 | BBDJ-1100001 - BBDJ-9999999 |
| Honda | BF40DK4 LHA | 40 | 4-Stroke | 16450-ZZ5-003 | BBDJ-1300001 - BBDJ-9999999 |
| Honda | BF40DK4 LRTA | 40 | 4-Stroke | 16450-ZZ5-003 | BBDJ-1300001 - BBDJ-9999999 |
| Honda | BF50D LRTA | 50 | 4-Stroke | 16450-ZZ5-003 | BBEJ-1000001 - BBEJ-9999999 |
| Honda | BF50D XRTA | 50 | 4-Stroke | 16450-ZZ5-003 | BBEJ-1000001 - BBEJ-9999999 |
| Honda | BF50DK2 LRTA | 50 | 4-Stroke | 16450-ZZ5-003 | BBEJ-1100001 - BBEJ-9999999 |
| Honda | BF50DK2 XRTA | 50 | 4-Stroke | 16450-ZZ5-003 | BBEJ-1100001 - BBEJ-9999999 |
| Honda | BF50DK4 LRTA | 50 | 4-Stroke | 16450-ZZ5-003 | BBEJ-1300001 - BBEJ-9999999 |
| Honda | BF50DK4 XRTA | 50 | 4-Stroke | 16450-ZZ5-003 | BBEJ-1300001 - BBEJ-9999999 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Fuel Injector Assembly |
| Installation | Direct OEM replacement |
| Fuel Type | Gasoline |
| Connection | Electrical connector with fuel line |
| Housing Material | Metal |
| Housing Color | Silver/metallic |
| Dimensions | 8 cm x 4.5 cm x 3.5 cm |
| Weight | 0.05 lbs (0.023 kg) |
| Fitting Type | 6-hole injector nozzle |
| Warranty | 1 Year (aftermarket versions) |
| Other Technical Attributes | Flow matched to OEM standards, 100% tested for internal coil resistance and fuel flow rate |
Package Contents
- 1 x Fuel Injector Assembly (16450-ZZ5-003)
Installation Guide
Professional installation is recommended. Always consult your service manual before beginning work. The following is a general guide:
- Safety First: Ensure the engine is fully cooled. Disconnect the negative terminal from the battery.
- Relieve Fuel Pressure: To prevent fuel spray, safely relieve pressure from the fuel system according to your engine's service manual.
- Disconnect: Unplug the electrical connector from the fuel injector.
- Remove Fuel Line: Place a rag underneath the connection to catch spills and carefully disconnect the fuel line from the injector.
- Unseat Injector: Unbolt the fuel rail and carefully pull the old injector assembly out. Note its orientation.
- Prepare New Injector: Lightly lubricate the new injector's O-rings with clean engine oil for a smooth installation and proper seal.
- Install New Injector: Press the new injector firmly into its port on the fuel rail, ensuring it is properly seated.
- Secure Connections: Re-fasten the fuel rail. Reconnect the fuel line and the electrical connector, ensuring both are secure.
- Check for Leaks: Reconnect the battery. Turn the ignition key to the "On" position (without starting the engine) several times to prime the system and build pressure. Visually inspect for any fuel leaks.
- Final Test: Once confirmed there are no leaks, start the engine and let it idle, checking again for any issues.
Troubleshooting & FAQ
Q: How do I confirm this injector fits my Honda engine?
A: This injector is specifically for Honda BF40D and BF50D series 4-stroke outboards. To ensure a perfect match, please compare your engine's model and serial number with the ranges listed in our "Compatible Engine Models" table. It is a direct replacement for OEM part number 16450-ZZ5-003.
Q: What are the common signs of a failing fuel injector?
A: Symptoms of a faulty injector include rough idling, engine misfires (especially at idle or under load), poor acceleration, reduced fuel economy, and difficulty starting the engine.
Q: Is this a genuine Honda part?
A: This is a high-quality aftermarket part, not a genuine Honda OEM component. It is designed and manufactured to meet or exceed OEM specifications for fit, form, and function, offering a reliable alternative.
Q: Does this injector require any calibration before installation?
A: No. Each injector is 100% tested for flow rate and coil resistance at the factory, so it arrives ready to install without any need for additional calibration.
Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 5–15 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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