YAMAHA 6AW-8591A-01-00 Outboard Engine Control Unit

( Manufacturer Part Number: 6AW-8591A-01-00 ), ( Part Type: Control Engine Unit ), ( Country Of Origin: United States )

Review YAMAHA Outboard Oem Engine Control Unit Assy fits F350

The **Yamaha 6AW-8591A-01-00 F350 Outboard Engine Control Unit (ECU)** is a precision-engineered electronic module designed exclusively for Yamaha s F350 outboard motor series, serving as the brain of the engine s fuel injection and performance management system. This advanced control unit integrates seamlessly with the F350 s fuel-injected powertrain, delivering optimized throttle response, fuel efficiency, and emissions compliance through its sophisticated closed-loop feedback mechanisms. Built with Yamaha s proprietary electronic architecture, the ECU features a robust, water-resistant housing to withstand the harsh marine environment, ensuring reliable operation even under demanding conditions such as saltwater exposure, vibration, and temperature fluctuations. Inside, the unit houses a high-performance microprocessor that continuously monitors critical engine parameters including crankshaft position, throttle angle, intake air temperature, and exhaust oxygen levels adjusting fuel delivery and ignition timing in real time to maximize power output while minimizing wear and tear. The ECU also incorporates diagnostic capabilities, allowing for fault code retrieval via Yamaha s proprietary diagnostic tools, which helps mechanics pinpoint issues like sensor malfunctions, fuel system inefficiencies, or electrical shorts before they escalate. Whether installed in a recreational fishing boat, a performance cruiser, or a utility vessel, this control unit ensures smooth, responsive performance across a range of operating speeds, from leisurely cruising to high-load conditions. Its compatibility with Yamaha s broader F-series outboard ecosystem also means it can be easily integrated with complementary systems like the engine s electronic control module (ECM) and throttle linkage, providing a cohesive and high-performance driving experience. For boat owners and marine technicians seeking reliability, precision, and cutting-edge technology, the **6AW-8591A-01-00 ECU** stands as an indispensable component, bridging the gap between raw mechanical power and refined electronic control to deliver unmatched performance on the water.

### **Pros and Cons of buying a Yamaha 6AW-8591A-01-00 (F350 Outboard Engine Control Unit)**

1. **Compatibility and Reliability** This ECU is designed specifically for Yamaha F350 outboard engines, ensuring seamless integration with the engine s control systems. Yamaha s reputation for durability and performance means this part is likely to function as intended when properly installed.

2. **Performance Optimization** A properly functioning ECU ensures optimal fuel delivery, ignition timing, and throttle response, which can improve engine efficiency, power output, and overall performance. If the original ECU was failing, replacing it may restore or even enhance the engine s operation.

3. **Prevents Further Damage** A faulty ECU can lead to misfires, poor fuel economy, or even catastrophic engine failure if left unaddressed. Replacing it with an OEM or high-quality aftermarket unit can prevent costly repairs down the line.

4. **Warranty Coverage (If Applicable)** If purchased from an authorized Yamaha dealer or a reputable supplier, the ECU may come with a warranty, providing peace of mind against defects in materials or workmanship.

5. **Ease of Installation** Since this is an OEM part, it should fit directly into the engine s wiring harness without requiring extensive modifications. However, installation still requires basic mechanical and electrical knowledge or professional assistance.

6. **Long-Term Cost Savings** While the upfront cost may be higher than some aftermarket alternatives, an OEM ECU is less likely to fail prematurely, saving money on repeated replacements or repairs.

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1. **Cost** OEM parts like this ECU are typically more expensive than aftermarket alternatives. The price can range significantly depending on the supplier, with some sellers charging premium rates for "new" or "like-new" units.

2. **Limited Availability** Depending on the region, finding an authentic Yamaha ECU may require ordering from a specialty marine parts dealer or an online marketplace, which could involve shipping delays or higher costs.

3. **Installation Complexity** While the part itself is straightforward, replacing an ECU often requires disconnecting wiring harnesses, resetting the engine s control systems, and possibly recalibrating sensors. DIYers without experience may struggle, and professional installation adds to the cost.

4. **Potential Counterfeit Risks** Buying from untrusted sellers increases the risk of receiving a counterfeit or refurbished part that doesn t meet OEM specifications. This could lead to poor performance, failure, or voided warranties.

5. **No Upgrades or Customization** Unlike aftermarket ECUs, this is a stock unit with no tunability or performance-enhancing features. If you re looking to modify throttle response, fuel mapping, or other parameters, you ll need a third-party ECU or tuner.

6. **Age of the Part** If the engine is older, the ECU may be a discontinued model, making it harder to find replacements or support. Additionally, the part may not benefit from the latest firmware updates or improvements.

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The **Yamaha 6AW-8591A-01-00 ECU** is a reliable, OEM-quality replacement for the F350 outboard engine, offering compatibility, performance, and long-term durability. It is the best choice if you prioritize authenticity, warranty coverage, and peace of mind. However, the higher cost, potential installation challenges, and limited availability may deter some buyers.

If you re on a tight budget or seeking additional features (like tunability), an aftermarket ECU from a reputable brand (e.g., SeaFox, Torqeedo, or Yamaha-compatible third-party units) could be a viable alternative though always ensure it s tested and compatible with your engine model.

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- **Buy from an authorized Yamaha dealer or a trusted marine parts supplier** (e.g., West Marine, BoatUS, or a local Yamaha service center) to guarantee authenticity and warranty coverage.

- **Verify the part number and engine compatibility** before purchasing to avoid mismatches.

- **Consider professional installation** if you re not experienced with marine electrical systems, as improper handling can damage the ECU or other components.

- **Back up your purchase with a warranty** and keep receipts in case of defects.

- **If tuning or performance upgrades are desired**, research aftermarket ECUs or tuners that are specifically designed for Yamaha F350 engines.

For most users seeking a direct OEM replacement, this ECU is the safest and most reliable option, provided it is sourced responsibly.

Details:

Hardware not included unless pictured. Instruction / installation manual not included. This is off of a YAMAHA LF350TXR 2008 4-stroke outboard motor.It in good working condition and may fit other years model's. Anchor up at Anything Outboard for THOUSANDS of hard to find boat parts, original manufacturers parts and marine surplus.

GOOD WORKING CONDITION. Sold as seen in pictures. A Message from Anything Outboard.

part #: 6aw8591a0100 prices

• $175.20-$600.00

specifications ouboaen:

• for models: F350
• for makes: Yamaha
• mpn: 6aw-8591a-01-00
• part type: Control Engine Unit
• country of origin: United States

offer ouboaen:

• availability: In Stock
• quantity: 1
• options: Ship-to-home
• sold: 0
• started: March 10, 2026
• best offers: True

general ouboaen:

• condition: Used
• Boat Parts > Outboard Engines Components > Other

shipping ouboaen:

• class: Expedited
• cost: $18.50
• service: USPS Priority Mail
• type: Fixed
• transit: 4-10 Days
• carrier: USPS

payments ouboaen:

• wallet: Paypal
• credit card: Visa
• other

returns ouboaen:

• policy: No Returns

seller ouboaen:

• city: Charleston, South Carolina
• rating: 100.0%
• # reviews: 1514

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