MerCruiser Alpha One Gen I complete standard-rotation sterndrive

OMC Cobra to Alpha One Gen II Sterndrives

Shop modified SE116 sterndrives for select OMC Cobra conversion applications, with 1.47, 1.62, 1.81 and 1.94 gear ratios plus standard and counter-rotation configurations.

OMC Cobra to Alpha One Gen II Sterndrives

Shop MerCruiser Alpha One Gen II modified sterndrives for Cobra conversion applications. These modified-ratio units are designed to adapt an Alpha One Gen II drive for use in place of a discontinued OMC Cobra sterndrive setup, letting you keep your boat running without hunting for hard-to-find original Cobra parts.

Find the correct modified ratio for your Cobra conversion Alpha One Gen II installation below.

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  • Complete Sterndrive | SE116 | 1.47 Modified | Gen II

    Complete Sterndrive | SE116 | 1.47 Modified | Gen II SKU: SE90-116-01DM,90-116-02
    MPN: SE116-COMPLETE-DM

    $2,035.00
    $2,258.85
    $2,035.00
    Restore elite high-speed performance with this Modified Complete Sterndrive, a premium aftermarket replacement for Alpha One Gen II systems. Engineered with a 1.47 gear ratio, this unit is optimized for high-horsepower V8 engine applications, delivering rapid acceleration and improved throttle response. Featuring a strengthened...
    $2,035.00
    $2,258.85
    $2,035.00
  • Complete Sterndrive | SE116 | 1.62 Modified | Gen II

    Complete Sterndrive | SE116 | 1.62 Modified | Gen II SKU: SE90-116-01CM,90-116-02
    MPN: SE116-COMPLETE-CM

    $2,035.00
    $2,258.85
    $2,035.00
    Restore peak performance with this Modified Complete Sterndrive, a premium aftermarket replacement for Alpha One Gen II systems. Engineered with a high-speed 1.62 gear ratio, this unit is optimized for V8 engine applications requiring superior high-torque output and rapid acceleration. Built with a heavy-duty...
    $2,035.00
    $2,258.85
    $2,035.00
  • Complete Sterndrive | SE116 | 1.81 Modified Ratio | Gen II

    Complete Sterndrive | SE116 | 1.81 Modified Ratio | Gen II SKU: SE90-116-01BM,90-116-02
    MPN: SE116-COMPLETE-BM

    $2,035.00
    $2,258.85
    $2,035.00
    Restore peak propulsion and mechanical efficiency with this Modified Complete Sterndrive Assembly, engineered as a premium aftermarket replacement for Alpha One Gen II systems. Featuring a 1.81 gear ratio, this unit is optimized for V6 and small-block V8 engines, providing superior acceleration, enhanced maneuverability,...
    $2,035.00
    $2,258.85
    $2,035.00
  • Complete Sterndrive | SE116 | 1.94 Modified | Gen II

    Complete Sterndrive | SE116 | 1.94 Modified | Gen II SKU: SE90-116-01AM,90-116-02
    MPN: SE116-COMPLETE-AM

    $2,035.00
    $2,258.85
    $2,035.00
    Upgrade your vesselā€™s drive system with this Modified Complete Sterndrive, a premium aftermarket replacement for Mercruiser Alpha One Gen II units. Engineered with a 1.94 gear ratio, this modified assembly is specifically designed to enhance acceleration and torque delivery for mid-range engine configurations. Built...
    $2,035.00
    $2,258.85
    $2,035.00
  • Complete Sterndrive | SE116 | 1.47 CR | Alpha One Gen II

    Complete Sterndrive | SE116 | 1.47 CR | Alpha One Gen II SKU: SE90-116-01DM,90-118-02
    MPN: SE118-COMPLETE-AM

    $2,265.00
    $2,514.15
    $2,265.00
    Restore elite high-speed performance and balanced handling with this Modified Counter-Rotation Sterndrive, a premium aftermarket replacement for Alpha One Gen II systems. Engineered with a 1.47 gear ratio, this unit is optimized for high-horsepower V8 engine configurations in twin-engine setups, providing high-torque output and...
    $2,265.00
    $2,514.15
    $2,265.00
  • Complete Sterndrive | SE116 | 1.62 CR | Alpha One Gen II

    Complete Sterndrive | SE116 | 1.62 CR | Alpha One Gen II SKU: SE90-116-01CM,90-118-02
    MPN: SE118-COMPLETE-AM

    $2,265.00
    $2,514.15
    $2,265.00
    Eliminate steering torque and restore balanced handling with this Modified Counter-Rotation Sterndrive, a premium aftermarket replacement for Alpha One Gen II systems. Engineered with a 1.62 gear ratio, this unit is optimized for high-horsepower V8 engine configurations in twin-engine setups, providing high-torque output and...
    $2,265.00
    $2,514.15
    $2,265.00
  • Complete Sterndrive | SE116 | 1.81 CR | Alpha One Gen II

    Complete Sterndrive | SE116 | 1.81 CR | Alpha One Gen II SKU: SE90-116-01BM,90-118-02
    MPN: SE118-COMPLETE-AM

    $2,265.00
    $2,514.15
    $2,265.00
    Eliminate steering torque and achieve perfectly balanced handling with this Modified Counter-Rotation Sterndrive, a premium aftermarket replacement for Alpha One Gen II systems. Engineered with a 1.81 gear ratio, this unit is optimized for V6 and small-block V8 engines in twin-engine configurations, ensuring efficient...
    $2,265.00
    $2,514.15
    $2,265.00
  • Complete Sterndrive | SE116 | 1.94 CR | Alpha One Gen II

    Complete Sterndrive | SE116 | 1.94 CR | Alpha One Gen II SKU: SE90-116-01AM,90-118-02
    MPN: SE118-COMPLETE-AM

    $2,265.00
    $2,514.15
    $2,265.00
    Eliminate steering torque and achieve perfectly balanced handling with this Modified Counter-Rotation Sterndrive, a premium aftermarket replacement for Alpha One Gen II systems. Engineered with a 1.94 gear ratio, this unit is optimized for V6 and small-block V8 engines in twin-engine configurations, ensuring efficient...
    $2,265.00
    $2,514.15
    $2,265.00

A Clearer Way to Select Your Replacement Drive

Compare the configuration details that matter before choosing a sterndrive.

OEM-COMPATIBLE FITMENT

Engineered for direct replacement

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How to Choose the Correct Modified SE116

Start with your existing drive information when choosing an OMC Cobra to Alpha One Gen II conversion sterndrive. Similar-looking sterndrives can use different ratios or rotation configurations, so the original drive and conversion requirements should determine your selection.

Next, compare the required gear ratio with the available SE116 1.47, 1.62, 1.81 and 1.94 modified sterndrives. Then confirm whether your setup requires standard or counter rotation. Do not select a drive from horsepower, engine position or visual appearance alone.

If any identifying information is missing or does not agree with the product listing, verify fitment before placing the order.

Before Ordering, Confirm:

  • OMC Cobra drive family and application
  • Engine model and serial information
  • Existing drive or assembly number
  • Required gear ratio
  • Standard or counter rotation
  • Current conversion configuration
  • Correct modified SE116 product
  • Included and separately required components

Modified SE116 Gear Ratio & Rotation Guide

Use this table to compare the modified SE116 sterndrives currently grouped for Cobra conversion applications. The table is an inventory-selection guide, not a universal engine-fitment chart. Confirm the required ratio, rotation and application before ordering.

Gear Ratio Modified SE116 Standard / Counter-Rotation Configuration
1.47 Standard: SE90-116-01DM + 90-116-02 ā€” Counter Rotation: SE90-116-01DM + 90-118-02 ā€” Verify the Cobra conversion application, required 1.47 gear ratio and rotation before ordering
1.62 Standard: SE90-116-01CM + 90-116-02 ā€” Counter Rotation: SE90-116-01CM + 90-118-02 ā€” Confirm the Cobra conversion application, required 1.62 gear ratio and rotation before ordering
1.81 Standard: SE90-116-01BM + 90-116-02 ā€” Counter Rotation: SE90-116-01BM + 90-118-02 ā€” Match the Cobra conversion application, required 1.81 gear ratio and rotation before ordering
1.94 Standard: SE90-116-01AM + 90-116-02 ā€” Counter Rotation: SE90-116-01AM + 90-118-02 ā€” Verify the Cobra conversion application, required 1.94 gear ratio and rotation before ordering

Do You Need a Complete Modified SE116 Sterndrive?

A modified SE116 complete sterndrive is different from the Cobra conversion components used to adapt the installation or an individual upper, lower or service component. Identify which part of your OMC Cobra conversion setup actually requires replacement before ordering.

Modified SE116 Complete Sterndrive

  • The complete removable outdrive requires replacement
  • Both the upper and lower drive sections need replacement
  • Your existing Cobra conversion setup specifically requires a modified SE116 complete sterndrive
  • You have confirmed the required 1.47, 1.62, 1.81 or 1.94 gear ratio
  • Standard or counter rotation has been verified
  • The selected drive matches the intended OMC Cobra conversion application

Cobra Conversion Components

  • The original OMC Cobra installation is being converted
  • The modified complete sterndrive is not the only component required
  • Conversion-specific mounting or installation components still need to be identified
  • Existing conversion hardware is missing, damaged or not yet installed
  • You need OMC Cobra conversion parts rather than another complete drive
  • You are confirming what is required to complete the conversion installation

Individual Upper, Lower or Service Components

  • The complete modified sterndrive does not require replacement
  • Only the upper drive section has failed
  • Only the lower-unit section requires replacement
  • A service component has been positively identified as the problem
  • Your boat already has the required conversion configuration installed
  • You need an individual Alpha One Gen II drive component rather than the complete assembly
An informational comparison graphic titled 'STANDARD VS COUNTER ROTATION' showing two outboard motors and two propellers, with text explaining the difference in propeller direction when viewed from behind. The background is a real marina scene with water and boats, but the image functions as an explanatory diagram rather than a straightforward product photo.

Standard vs Counter-Rotation SE116 Sterndrives

Modified SE116 Cobra conversion drives are available in both standard and counter-rotation configurations. Rotation is an important fitment requirement and should be confirmed from the existing drive and applicationā€”not assumed only from where the drive is mounted on the boat.

Standard Rotation

Choose a standard-rotation modified SE116 only when your verified OMC Cobra conversion setup requires the standard configuration. Standard drives in this collection are available with 1.47, 1.62, 1.81 and 1.94 gear ratios.

Counter Rotation

A counter-rotation SE116 sterndrive uses a different lower-unit configuration and must be matched to a setup that specifically requires counter rotation. This collection includes 1.47, 1.62, 1.81 and 1.94 counter-rotation options.

Choose Your Modified SE116 Gear Ratio

The correct gear ratio is a key part of selecting an OMC Cobra conversion sterndrive. Browse the available modified SE116 ratios below, then confirm whether your application requires standard or counter rotation.

  1. SE116 1.47 Ratio

    Shop modified SE116 1.47 sterndrives for supported Cobra conversion applications. Available in standard and counter-rotation configurations.

    View 1.47 Drives

  2. SE116 1.62 Ratio

    Browse SE116 1.62 modified complete sterndrives and compare standard versus counter-rotation options before selecting your drive.

    View 1.62 Drives

  3. SE116 1.81 Ratio

    Explore modified SE116 1.81 gear-ratio sterndrives for compatible OMC Cobra conversion configurations and verify rotation before ordering.

    View 1.81 Drives

  4. SE116 1.94 Ratio

    Shop SE116 1.94 modified sterndrives in standard and counter-rotation configurations for supported Cobra conversion applications.

    View 1.94 Drives

Why Is the SE116 Modified for a Cobra Conversion?

The sterndrives in this collection are modified SE116 complete sterndrive configurations intended for specific Cobra conversion applications. They should not be treated as ordinary Alpha One Gen II replacements simply because they use the same SE116 family name.

The modification identifies these drives as part of a supported OMC Cobra conversion shopping path. Before ordering, confirm that your boat requires the modified Cobra-conversion configuration as well as the correct gear ratio and rotation. A standard Alpha One Gen II replacement should not automatically be substituted for a modified conversion drive.

What Customers Say

Complete life saver for obsolete OMC Cobra drive

Converting my 1989 OMC Cobra 5.7L to an Alpha One Gen II modified drive using this kit was the best decision. The 1.47:1 ratio drive bolted onto the modified conversion housing perfectly. No more dealing with hard-to-find OMC shift cables or obsolete gearcases.
Lucas Bennett Verified buyer
August 2026

Clear conversion instructions for 4.3L OMC setup

The product page and technical support made ordering the right 1.81:1 ratio modified Gen II drive for my 1991 OMC Cobra 4.3L V6 straightforward. The modified water passage and drive alignment kit mated up cleanly with my transom cutout.
Gavin Hayes Verified buyer
July 2026

Smooth shifting and reliable water flow

Upgraded an old 1988 OMC Cobra 5.0L V8 setup. The modified Alpha One Gen II outdrive solved all my chronic shift cable adjustment problems. Water pressure from the impeller pump is excellent and the unit runs super quiet.
Zachary Sterling Verified buyer
June 2026

Perfect 2.00 ratio match for 3.0L OMC Cobra

Finding parts for an early 1990s 3.0L OMC Cobra was impossible until I found this modified Gen II drive kit. The 2.00:1 ratio unit bolted right up with the adapter hardware. Shifting is lightyears better than the original OMC setup.
Julian Ross Verified buyer
May 2026

Heavy-duty packaging and complete hardware kit

The unit arrived in double-walled crates with thick foam protection. Converting my 1990 OMC 5.8L Ford block required double checking the input splines, but Mariners Warehouse fitment support guided me through every step.
Cody Mercer Verified buyer
April 2026

Great alternative to a costly transom replacement

Instead of ripping out the entire OMC transom assembly to install a Mercruiser gimbal, this Cobra conversion modified drive allowed a direct bolt-on swap. Saved me weeks of fiberglass work and thousands of dollars.
Tristan Vance Verified buyer
March 2026

Flawless performance after 15 hours of break-in

Installed the modified 1.62:1 ratio Alpha Gen II on a 1992 OMC 5.0L HO setup. The shift linkage and water hose kit integrated seamlessly. After completing the gear lube break-in period, the boat runs smoother than ever.
Logan Caldwell Verified buyer
February 2026

Solid engineering for OMC Cobra replacements

The modified Gen II drive housing and input yoke fit my OMC transom plate without binding. Alignment tool slid right in during setup. Very impressive build quality and fast shipping from Mariners Warehouse.
Ethan Drake Verified buyer
January 2026

Helpful Guides

Use these guides to identify your MerCruiser drive, understand gear-ratio selection and decide whether you need a complete sterndrive, upper unit or lower unit.

OMC Cobra to Alpha One Gen II conversion sterndrives displayed on a marine workshop bench

OMC Cobra to Alpha One Gen II Conversion: What You Need to Know

OMC Cobra Conversion Buying Guide OMC Cobra to Alpha One Gen II Conversion: What You Need to Know An OMC...

Read More ā†’
Marine sterndrive gears arranged for comparing SE116 gear ratio configurations

How to Choose the Correct SE116 Gear Ratio

SE116 Gear Ratio Buying Guide How to Choose the Correct SE116 Gear Ratio Choosing between an SE116 1.47, 1.62, 1.81...

Read More ā†’
Twin marine sterndrives with standard and counter-rotation propeller configurations

Standard vs Counter-Rotation SE116 Sterndrives

SE116 Rotation Buying Guide Standard vs Counter-Rotation SE116 Sterndrives Standard rotation and counter rotation are application-specific sterndrive configurations. Confirming the...

Read More ā†’

Frequently Asked Questions

What is a modified SE116 sterndrive?

A modified SE116 is a complete sterndrive configuration intended for specific OMC Cobra conversion applications rather than an ordinary Alpha One Gen II replacement application. Confirm the conversion requirement, gear ratio and rotation before ordering.

Is a modified SE116 the same as an OMC Cobra conversion kit?

No. A modified SE116 sterndrive is the drive assembly used within supported Cobra conversion applications, while the conversion process may require additional application-specific components. Check what is already installed and what the selected product includes before ordering.

What gear ratios are available for the modified SE116 Cobra conversion drives?

This collection includes modified SE116 sterndrives in 1.47, 1.62, 1.81 and 1.94 gear ratios . Each ratio is available in standard and counter-rotation configurations, but the correct ratio must be verified for your application.

How do I choose the correct SE116 gear ratio?

Match the required SE116 gear ratio to the verified specifications of your existing drive and conversion setup. Do not select a ratio only from engine horsepower or boat type because similar applications can require different drive configurations.

What is the difference between standard and counter-rotation SE116 drives?

Standard and counter-rotation sterndrives operate with different propeller-rotation configurations. Choose the configuration required by your verified setup and do not determine rotation from port or starboard position alone.

Will any OMC Cobra work with an Alpha One Gen II conversion?

No. An OMC Cobra to Alpha One Gen II conversion is application-specific, and not every Cobra drive should be assumed compatible. Identify the existing drive and engine information and verify that the conversion is supported before purchasing components.

Can I use a regular Alpha One Gen II sterndrive instead of a modified SE116?

Do not substitute a standard Alpha One Gen II sterndrive for a modified Cobra conversion SE116 without confirming the application. The modified drives in this collection are specifically categorized for supported Cobra conversion setups.

What information do I need for an OMC Cobra conversion fitment check?

Provide the OMC Cobra application, engine model and serial information, existing drive or part number, required gear ratio and rotation. Any existing conversion information can also help identify the correct modified SE116 configuration.

Do I need additional parts with a modified SE116 sterndrive?

Additional conversion, installation or service components may be required depending on the existing setup. Do not assume every OMC Cobra conversion component is included with the drive; check the selected product and conversion requirements before installation.

Why do I need to verify rotation before ordering a Cobra conversion sterndrive?

Standard and counter-rotation modified SE116 drives are different configurations. Matching the correct Cobra conversion sterndrive rotation helps prevent ordering a drive that does not correspond to the required installation.

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