Yamaha Lower Unit | Yamaha Outboard Lower Unit

Yamaha Lower Unit helps in changing the power of engine belongs to Yamaha outboard to rotation of the propeller shaft that moves the propeller. Moving the propeller moves the boat. Lower unit an essential part of your outboard and ultimately helps your boat move. If you have yamaha outboard and lower unit is not working then make sure to buy yamaha outboard lower unit of high quality such as SEI yamaha lower unit that comes with 3 years warranty. Keep in your mind that the lower unit requires periodical maintenance and care to keep it functioning. There is huge pressure on the lower unit oil inside when your boat moves because of the way the lower unit works. So keep it maintained for smooth journey. Outboard consists of three major parts; Powerhead (Engine), Midsection (Exhaust Housing) and Lower Unit (Gearbox or Gearcase). Below are major Yamaha lower units that fit most of the outboards.
Replaces most Yamaha 90 Degree V6 2-Stroke and some inline 4 cylinder 4-Stroke engines


Replaces most Yamaha 76 Degree V6


Replaces all Yamaha V4 2-Stroke and some 4-Stroke


Replaces all Yamaha 4-Stroke 250 HP


Counter Rotation - Replaces some Yamaha V6 2 & 4 Stroke


Replaces most 200HP/225HP and some 250HP Yamaha 76 Degree V6 Counter Rotation Motors


Replaces all Yamaha 4-Stroke 250 HP Counter Rotation




Yamaha 2 Stroke Models

In Marine industry, Yamaha is actively manufacturing 2 stroke models from 8 - 150 horsepower (HP) and High Pressure Direct Injection (HPDI) models from 150 - 300 horsepower.

Yamaha 4 Stroke Models

Yamaha didn’t limit the business to two-stroke only, they are also manufacturing 4-stroke Yamaha as the emissions standards are becoming stricter. Yamaha 4-stroke outboards include 2.5 HP to 350 HP. Compare to two-stroke, Yamaha 4-stroke are very heavy. We have listed Yamaha 150 four stroke for sale on our website.

Yamaha Lower Unit Rebuild Kit


We suggest that instead of buying Yamaha Lower Unit Rebuild Kit that is around $800, you should go for Complete Lower Unit instead. By paying extra $100 you can get lower unit. However, please browse Yamaha Outboard Parts page if you are looking to buy rebuild kits.

Some of the most frequently used Yamaha gearbox are listed below. You can see individual product pages for more details on them.

Yamaha 150 Lower Unit or Yamaha F150 Lower Unit

  • It's model number 90-416.
  • This lower unit comes with 3-Year Fault Free Warranty.
  • This lower unit is for Yamaha 150 horsepower engine.
  • It is new Aftermarket Unit, not Re-manufactured.
  • For installation also Includes break-in instructions.
  • Lower unit shifts in forward, neutral and reverse.

Yamaha 115 Lower Unit or Yamaha F115 Lower Unit

  • This is a 115hp lower unit which will fit models from 2000 to 2015.
  • This lower unit comes with 3-Year Fault Free Warranty.
  • The lower unit is best for Yamaha 115 horsepower engine.
  • This is not remanufactured but it's new aftermarket unit.
  • Includes break-in instructions for installation.
  • Lower unit can be shifted forward, neutral and reverse.

Yamaha F250 Lower Unit

  • It's model number 90-422 also 90-421 depending on the year.
  • This lower unit comes with 3-Year Fault Free Warranty.
  • The 250 horsepower engine's lower unit for Yamaha.
  • It is new Aftermarket Unit, not just remanufactured.
  • Includes break-in instructions to help in installation.
  • Lower unit shifts easily in forward, neutral and reverse.

Yamaha 250 Lower Unit

  • If It is 2 stroke then model number 90-421
  • If 4 stroke engine then 90-421 and 90-422 depends on the year.
  • This lower unit is for Yamaha 250 horsepower engine.
  • It is a new aftermarket unit, not remanufactured.
  • This lower unit comes with 3-Year Fault Free Warranty.
  • Includes break-in instructions.
  • Lower unit can easily shifted in forward, neutral and reverse direction.

Yamaha 225 Lower Unit

  • If It's two stroke engine then 90-421
  • If It's 4 stroke then anyone from 421 or 422 depending on the year.
  • This lower unit is for Yamaha 225 horsepower engine.
  • Includes break-in instructions.
  • Lower unit shifts in forward, neutral and reverse.
  • It comes with 3-Year Fault Free Warranty.

    Why Buy SEI Yamaha Lower Unit?

    In the aftermarket sterndrive business, SEI is a leading company and also has it’s own outboards. Apart from Yamaha outboard replacement, Sterndrive Engineering (SEI) also produces Johnson Evinrude and Mercury. Replacement sterndrives this company include Alpha Gen I and Gen II. Parts can be interchanged with the Original Equipment Manufacturer (OEM). Outdrives manufactured by SEI are brand-new and that they don’t remanufacture. So you’re safe with such compatible and totally new outdrives.

    What about Warranty? This is another thing that makes SEI drives standout in the market with 3 year fault-free warranty.

    What Does Fault-Free Warranty Mean? The term fault-free indicates that the unit your purchased from the company is covered failures that may demand the replacement or repairing of the unit. Your outdrive is always covered and looks like one of the best warranty in marine outdrive industry. SEI tries to go extra mile to give their customers a peace of mind while they are over the water.

    Are these Lower Units Tested? It’s a responsibility of Quality Control department of every company to ensure the quality of every product produced and same goes to this company. They test all parts aggressively to make sure that all parts from shafts, gears, bearings to other wear parts are of high standard and long lasting.

    So if you’re looking for yamaha outboard lower unit rebuild then why not consider aftermarket yamaha lower unit, especially when it comes with three year fault-free warranty and you can interchange the parts with OEM? SEI produces aftermarket replacement lower unit. They have Yamaha gearcase for V6 outboards that includes two stroke and four stroke.

    Aftermarket Lower Units


    There are two options available either to repair your outboard motor after an accident or to replace worn-out parts of the outboard motor. The options are OEM parts and aftermarket parts. Both of the options are good but what kind of parts are best and you want to be used in your outboard motor to get best results. So for this purpose we have made some comparisons, listed below, between these two part types to help you to arrive at right decision.

    OEM parts: OEM stands for Original Equipment Manufacturer so it's clear from name that these are the parts directly made by outboard motor's manufacturer and not by third party. So these parts fits to the specification of the model of outboard motor in your use. So these parts provide you the same performance as the replacing ones and provides you a peace of mind, and also most of the manufacturers provide these parts with a one year warranty. But with such benefits there are some cons about them, which are that they are much expensive as compared to the aftermarket parts. Although there are many other ways to buy them, like (eBay, online wholesalers), but most of the people will buy them from the dealer because it takes longer to get your outboard motor repaired by ordering them online, thus limited number of places you can buy them from. And you have paid more for OEM parts doesn't mean that they are better than aftermarket parts, sometimes aftermarket parts are equal to OEM parts or even better in some cases. So you might pay extra only for the brand name.

    Aftermarket parts: Those parts for the outboard motor which are supplied by manufacturers other than your outboard motor manufacturer are called as aftermarket parts means parts which are sourced from third party. They are manufactured at a high volume and may fits to the requirements of different models of outboard motor, not the specific make or model. They are similar to OEM parts in kind but may not be perfect for use. So you should deal with right mechanic to provide you with high quality parts. But they are much cheaper than OEM parts and sometime you may get a better quality part. In this case you have more variety to choose from and wider price range as many manufacturers are making same thing. But to keep cost down they may not come with warranty.

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