F250-F300 Yamaha Standard Rotation Lower Unit (2010-2021) | 30″ Driveshaft | Replaces OEM 6CE-45300-12-8D

F250-F300 Yamaha Standard Rotation Lower Unit is engineered as a precise aftermarket replacement for Yamaha F250 and F300 outboard engines manufactured from 2010 through 2021. Matching the OEM part number 6CE-45300-12-8D, this unit ensures a straightforward installation with guaranteed performance, featuring a 30-inch driveshaft length and a gear ratio of 1.75:1.

✅ Key Features:

• ⚙️ Exact OEM Fit: Compatible specifically with Yamaha F250UCA and F300UCA (2010-2021).
• Standard Rotation: Ideal for single-engine setups or standard rotation in dual-engine installations.
• ️ Robust Construction: Built with marine-grade aluminum to withstand corrosion and ensure longevity in saltwater.
• Gear Ratio: 1.75:1 ensures optimal power delivery matching original Yamaha specifications.
• Driveshaft Length: Standard 30 inches suited for typical transom heights.
• ️ Comprehensive Warranty: Backed by SEI’s renowned 3-Year Fault-Free Warranty covering accidental impacts, oil issues, fishing line entanglement, and more.

✅ Compatibility:

✅ Important Notes:

• ❌ Not suitable for engines featuring two-piece driveshaft configurations.
• ❌ Not compatible with engines equipped with Yamaha’s Thrust Enhancing Reverse Exhaust (TERE).

✅ Technical Specifications (Rich Snippets Ready):

• Brand: SEI Marine
• Part Number: SE430
• OEM Part Number: 6CE-45300-12-8D
• Product Type: Standard Rotation Lower Unit
• Gear Ratio: 1.75:1
• Driveshaft Length: 30-inch
• Rotation Type: Standard Rotation (Right-Hand Rotation)
• Warranty: 3-Year Fault-Free Warranty
• Material: Corrosion-resistant marine-grade aluminum

✅ Frequently Asked Questions (FAQs):

Q1: Is this lower unit compatible with all Yamaha F250 and F300 models? A: Specifically designed for Yamaha F250UCA and F300UCA models manufactured between 2010–2021. Verify your exact engine model for precise compatibility.

Q2: What components come with this lower unit? A: The SE430 package includes the lower unit assembly, internal gears, and a 30-inch driveshaft. Propellers and installation hardware are sold separately.

Q3: Do I need professional installation? A: Professional installation is recommended to ensure optimal performance and to uphold the warranty conditions.

Q4: How does SEI’s warranty compare to OEM warranties? A: SEI provides a superior 3-Year Fault-Free Warranty that includes coverage for impacts and accidental damages, surpassing typical OEM warranty conditions.

Q5: Is the lower unit corrosion-resistant for saltwater use? A: Absolutely, constructed with marine-grade aluminum specifically designed to resist corrosion in harsh saltwater environments.

Q6: What kind of maintenance is required? A: Routine maintenance involves regular gear oil changes, seal checks, and inspection for any fishing line entanglement or propeller damage.

Q7: Will my current Yamaha propeller fit this unit? A: Yes, the SE430 is fully compatible with standard Yamaha OEM propellers suitable for F250-F300 engines (2010-2021).

Q8: Looking lower unit for twin 300s Yamaha 2015 one left and one right turning that have bad lower units. Do y’all have replacement for these. Model #s lf300uca and f300uca. A: Yes, that’s the correct unit for standard rotation. You would need to search LF300UCA on our website for counter rotation.

✅ Call-To-Action (CTA):

Order the SEI Marine SE430 Standard Rotation Lower Unit today to ensure your Yamaha outboard continues performing at peak efficiency, backed by a trusted 3-Year Warranty.