Original price was: $1,921.90.$1,699.00Current price is: $1,699.00.
5 in stock
Search your model no. for perfect fit
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Manufacturer Warranty: 3-Year
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Return Policy: 60-day, hassle-free returns
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Trusted by 6,000+ boaters across the USA
Upgrade your Yamaha outboard’s performance with this SEI 423 aftermarket lower unit, built as a direct-fit replacement for F200–F300 models (2014–2021) with a 30″ driveshaft. Designed to match OEM specifications and engineered for durability, this lower unit offers a 1.75:1 gear ratio and fits single-piece driveshaft models without TERE (Thrust Enhancing Reverse Exhaust).
Fully assembled and ready to install
Direct OEM replacement—no modifications required
Compatible with Yamaha F250 & F300 4-stroke models
Painted black—can be repainted to match your engine
New aftermarket unit backed by a 1-year warranty
Replaces these OE #’s
6CE-45300-11-8D
6CE-45300-12-8D
6CE-45300-13-8D
6CE-45300-14-8D
6CE-45300-15-8D
| Specification | Details |
|---|---|
| Product Name | Yamaha F200–F300 4-Stroke Lower Unit |
| Compatible Models | F250UCA, F300UCA, F300BETU |
| Horsepower Range | 200HP to 300HP |
| Years Supported | 2014 – 2021 |
| Gear Ratio | 1.75:1 |
| Shaft Length | 30″ |
| Driveshaft Type | One-piece only (not for two-piece shafts) |
| TERE Compatibility | Not compatible with TERE |
| Condition | New – Aftermarket |
| Color | Black (paintable) |
| Warranty | 1 Year |
| OEM Replaces | 6CE-45300-11-8D, 12-8D, 13-8D, 14-8D, 15-8D |
| Part Code / SKU | 90-423-B30F |
| Installation | Direct Fit – No Modifications Required |
| Usage | Freshwater & Saltwater Compatible |
| Weight | 110 lbs |
|---|---|
| Dimensions | 60 × 37 × 10 in |
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