Yamaha Outboard Gearcase & Drive Parts

A Yamaha lower unit is built to deliver reliable performance on the water, but over time, wear and tear can lead to reduced efficiency or gear damage. Whether you're looking for a quick fix or a complete overhaul, we carry everything from a Yamaha lower unit rebuild kit to individual components designed to get your outboard back in top shape. If it's time for a Yamaha lower unit replacement, you'll find OEM and aftermarket options for a perfect fit and lasting durability. Use our easy Parts Finder above so you can shop with confidence and get back on the water faster.

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Yamaha Outboard Gearcase & Drive Parts Product Listings

Results (67)

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SEI SE418 Yamaha Counter-Rotating Lower Unit – 25" Shaft

$1,745.00

SEI SE418 Yamaha Counter-Rotating Lower Unit – 25" Shaft The SEI SE418 is an aftermarket counter-rotating replacement lower unit for select Yamaha four-stroke outboards. Both versions have a 25"...
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SEI SE421 90-421-B30F Yamaha Four-Stroke Lower Unit – 2.00:1 – 30" Shaft

$1,545.00

SEI SE421 Yamaha Four-Stroke Lower Unit – 2.00:1 – 30" Shaft The SEI 90-421-B30F SE421 is an aftermarket replacement lower unit for select Yamaha 200–225 HP V6 four-stroke outboards. Featuring...
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SEI SE422 Lower Unit for Yamaha F225 & F250 – Standard Rotation, 2.00:1

$1,745.00

SEI SE422 Lower Unit for Yamaha F225 & F250 – Standard Rotation, 2.00:1 The SEI SE422 is an aftermarket replacement lower unit for select Yamaha F225 and F250 outboards. Featuring a 2.00:1 gear...
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SEI SE423 Yamaha Outboard Lower Unit – 1.75:1 Ratio

$1,995.00

SEI SE423 Yamaha Outboard Lower Unit – 1.75:1 Ratio The SEI SE423 is an aftermarket replacement lower unit for select Yamaha outboards. Available in 25" and 30" shaft configurations, both versions...
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SEI SE428 Yamaha V6 Counter-Rotation Lower Unit – 30" Shaft

$1,745.00

SEI SE428 Yamaha Counter-Rotation Lower Unit – 30" Shaft The SEI SE428 is an aftermarket counter-rotation replacement lower unit for select Yamaha V6 outboards with a 30-inch driveshaft...
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SEI SE429 Yamaha LF250 Counter-Rotating Lower Unit – 2.00:1

$1,995.00

SEI SE429 Yamaha LF250 Counter-Rotating Lower Unit – 2.00:1 The SEI SE429 is an aftermarket counter-rotating replacement lower unit for select Yamaha LF250 outboards. Featuring a 2.00:1 gear ratio...
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SEI SE430 90-430-B30F Yamaha LF250/LF300 Counter-Rotation Lower Unit – 1.75:1 – 30" Shaft

$2,215.00

SEI SE430 Yamaha LF250/LF300 Counter-Rotation Lower Unit – 1.75:1 – 30" Shaft The SEI 90-430-B30F SE430 is an aftermarket counter-rotation replacement lower unit for select 2010–2021 Yamaha LF250...
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SEI Yamaha 150 HP Four-Stroke Lower Unit – 2.00:1 – 25" Short Shift Shaft

$1,545.00

SEI Yamaha 150 HP Four-Stroke Lower Unit – 2.00:1 – 25" Short Shift Shaft These SEI aftermarket replacement lower units fit select Yamaha 150 HP four-stroke outboards. Both versions feature a 2.00:1...
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SEI Yamaha 2 Stroke V4 Repl Lower Unit 2:1 25"

$1,670.52

$1,392.10

SEI Yamaha 2 Stroke V4 Repl Lower Unit 2:1 25" Note for purchasing: You must verify your Gear Ratio. Call for application assistance if needed, and have your engine serial number ready when calling...
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SEI Yamaha V6 2 Stroke 1.81:1 30" Shaft Repl Lower Unit

$1,670.52

$1,392.10

SEI Yamaha V6 2 Stroke 1.81:1 30" Shaft Replacement Lower Unit Note for purchasing: You must verify your Gear Ratio. Call for application assistance if needed, and have your engine serial number...
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Sierra 18-0024 Gear Housing Seal Kit

$27.69

$21.59

Sierra 18-0024 Gear Housing Seal Kit Sierra gear housing seal kit for Yamaha Outboards. Fits: E48 (1995-00)/ C55 (1989-94) Seal Kit Contains: O-ring 18-99009 Muffler gasket 18-99030 Upper...
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Sierra 18-0027 Gear Housing Seal Kit

$27.49

$21.49

Sierra 18-0027 Gear Housing Seal Kit for Yamaha Outboards Sierra gear housing seal kit for Yamaha engines. Fits: Yamaha 2HP (1989-2002) Seal Kit Contains: O-ring O-ring Oil seal Oil...
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Sierra 18-0588 Oil Seal

$2.79

$1.89

Sierra 18-0588 Oil Seal Sierra high-quality engine parts are designed to meet OEM specifications. Interchangeable with: Yamaha...
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Sierra 18-0714 Float Chamber Gasket

$27.09

$19.49

Sierra 18-0714 Yamaha Float Chamber Gasket Sierra replacement float chamber gasket for Yamaha Outboards. Interchangeable with: Yamaha Outboard 6AW-14984-00-00
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Sierra 18-2085 Oil Seal

$13.79

$9.89

Sierra 18-2085 Oil Seal Sierra replacement oil seal for Yamaha Outboards. I.D.: 34 mm O.D.: 52.25 mm Width: 8 mm Interchangeable with: Yamaha Outboard 93102-35M13-00
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Sierra 18-2773 Carrier Bearing Replaces 663-45331-00-94

$75.49

$54.49

Carrier Bearing Replaces 663-45331-00-94 Fits: E48 1995, 1997-2000 C55 1991-1995
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Sierra 18-74527 Gear Housing Seal Kit

$75.39

$54.29

Sierra 18-74527 Gear Housing Seal Kit Sierra replacement gear housing seal kit for Yamaha Outboards. Fits: Yamaha F9.9 (1997-2006) Seal Kit Contains: Water seal damper Seal damper 18-99045...
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Sierra O-Ring 18-0659

$5.39

$4.29

Sierra O-Ring 18-0659 Sierra pressure control valve o-ring meets or exceeds OEM specs. For use with Yamaha 40-70HP, 200-300HP All Models and Years. Interchangeable with: Yamaha Outboard...
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Sierra Oil Strainer Seal

$9.19

$7.39

Sierra Oil Strainer Seal Recommended application is use with 75-115HP outboards, all models and years. Meets or exceeds OEM specs, and fitment guaranteed to meet form, fit, and function of OE...
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Sierra Upper Unit Casing Gasket 18-99164

$51.39

$39.59

Sierra Upper Unit Casing Gasket 18-99164 Application: Yamaha 75-115HP 4-Stroke Outboards Interchangeable with: Yamaha Outboard 67F-45113-00-00

Yamaha Outboard Gearcases & Drive Parts

Doing work on your outboard motor is vital, no matter how small the task may appear at first. This is due to how important your outboard motor is - one wrong move might cost you a small fortune in the long run. To avoid a potential catastrophe, take a look at the long line of Yamaha outboard lower unit parts to be absolutely certain you have what you need for the job. We carry durable, high-quality replacement parts for prop shafts, carrier bearings, drain fill washers, and other Yamaha outboard parts. You can find all the Yamaha outboard gear cases and repair kits, making Wholesale Marine your one-stop-shop for all your boating needs.

Browse Yamaha Outboard Lower Unit Parts At Wholesale Marine

Whatever you may need to work on next, whether it’s searching for Yamaha outboard parts gear cases, changing your oil, doing electrical wiring, painting your exterior, or anything in between, you can always rely on Wholesale Marine to carry and stock what you need. Need help finding the right part for your engine? Give our customer service team a call at 1-877-388-2628! They're available Monday to Friday, 9 AM to 4 PM EST.