New Yamaha 250HP 4-Stroke (2005–2018) Replacement Lower Unit – Aftermarket – Standard Rotation – Fits 20″, 25″ & 30″ Shafts – 3-Year Warranty
Original price was: $1,572.25.$1,399.00Current price is: $1,399.00.
New Yamaha 200–250HP 2/4-Stroke (1990–2019) Replacement Lower Unit – Aftermarket – Counter Rotation – Fits 25″ & 30″ Shafts – 3-Year Warranty
Original price was: $1,552.89.$1,399.00Current price is: $1,399.00.
-12%
Fast delivery within 72 Hours
New Yamaha F200–F300 4-Stroke (2014–2021) Replacement Lower Unit – Aftermarket – Standard Rotation – Fits 30″ Shaft – 1.75 Gear Ratio – 3-Year Warranty
Original price was: $1,921.90.$1,699.00Current price is: $1,699.00.
5 in stock
Search your model no. for perfect fit
✔️
Manufacturer Warranty: 3-Year
✔️
Return Policy: 60-day, hassle-free returns
✔️
Trusted by 6,000+ boaters across the USA
Description
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 |
Additional information
| Weight | 110 lbs |
|---|---|
| Dimensions | 60 × 37 × 10 in |
| Google Part Number |
90-423-B30F |
| Google Product Category |
1125 |
You may also like
Skeg Guard for SE405 Lower Units
SKU:
ST-87-029-K
Original price was: $98.79.$89.00Current price is: $89.00.
Water Pump Kit With Housing
SKU:
ST-96-405-01CK
Original price was: $110.15.$99.23Current price is: $99.23.
Gear Lube Oil 88-102-01
SKU:
ST-88-102-01
Original price was: $18.32.$16.50Current price is: $16.50.Related Products
-10%
Select options
This product has multiple variants. The options may be chosen on the product page
Mercruiser Bravo SE128 Lower Only (Replaces Bravo Three Lowers) Lower Unit
SKU:
ST-90-128
Original price was: $2,491.95.$2,245.00Current price is: $2,245.00.-10%Hot
Select options
This product has multiple variants. The options may be chosen on the product page
New Yamaha 75–100HP 2/4-Stroke (1984–2017) Replacement Lower Unit – Aftermarket – Standard Rotation – Fits 20″ & 25″ Shafts – 2.0 & 2.3 Gear Ratios – 18 Spline – 3-Year Warranty
SKU:
ST-90-404
Original price was: $1,330.89.$1,199.00Current price is: $1,199.00.
PTT system Compatible with Johnson Evinrude Trim/Tilt system 88-225 HP 1988-1998
SKU:
ST-TT3003
Original price was: $1,219.89.$1,099.00Current price is: $1,099.00.
PTT System Compatible with Johnson/Evinrude Trim System for 75-115 V4 and 135-175 V6
SKU:
ST-TT3005
Original price was: $1,219.89.$1,099.00Current price is: $1,099.00.
Skeg Guard For SE404 Lower Units
SKU:
ST-87-032-K
Original price was: $98.79.$89.00Current price is: $89.00.
Skeg Guard For Sei 416/418/421/422/428/429 Lower Units
SKU:
ST-87-030-K
Original price was: $98.79.$89.00Current price is: $89.00.-10%
Select options
This product has multiple variants. The options may be chosen on the product page
Mercury Counter Rotation 218
SKU:
ST-90-218
Original price was: $1,548.45.$1,395.00Current price is: $1,395.00.-10%
Select options
This product has multiple variants. The options may be chosen on the product page
New Yamaha 115–130HP 2/4-Stroke (1984–2014) Replacement Lower Unit – Aftermarket – Standard Rotation – Fits 20″ & 25″ Shafts – 3-Year Warranty
SKU:
ST-90-405
Original price was: $1,330.89.$1,199.00Current price is: $1,199.00.-10%
Select options
This product has multiple variants. The options may be chosen on the product page
New Yamaha 150–200HP 2/4-Stroke (1984–2024) Replacement Lower Unit – Aftermarket – Standard Rotation – Fits 20″ & 25″ Shafts – 3-Year Warranty
SKU:
ST-90-416
Original price was: $1,330.89.$1,199.00Current price is: $1,199.00.-11%
Select options
This product has multiple variants. The options may be chosen on the product page
New Yamaha 150–200HP 2/4-Stroke (1990–2024) Replacement Lower Unit – Aftermarket – Counter Rotation – Fits 25″ Shaft – 3-Year Warranty
SKU:
ST-90-418
Original price was: $1,572.25.$1,399.00Current price is: $1,399.00.-10%
Select options
This product has multiple variants. The options may be chosen on the product page
New Yamaha 200–250HP V6 76° (1990–2019) Replacement Lower Unit – Aftermarket – Standard Rotation – Fits 20″, 25″ & 30″ Shafts – 3-Year Warranty
SKU:
ST-90-421
Original price was: $1,330.89.$1,199.00Current price is: $1,199.00.-10%
Select options
This product has multiple variants. The options may be chosen on the product page
New Yamaha 200–250HP 2/4-Stroke (1990–2019) Replacement Lower Unit – Aftermarket – Counter Rotation – Fits 25″ & 30″ Shafts – 3-Year Warranty
SKU:
ST-90-428
Original price was: $1,552.89.$1,399.00Current price is: $1,399.00.-12%
Select options
This product has multiple variants. The options may be chosen on the product page
New Yamaha 250HP 4-Stroke (2005–2018) Replacement Lower Unit – Aftermarket – Counter Rotation – Fits 25″ & 30″ Shafts – 2.00 Gear Ratio – 3-Year Warranty
SKU:
ST-90-429
Original price was: $1,921.90.$1,699.00Current price is: $1,699.00.
