Restore maximum cooling efficiency and dependable sterndrive power with this premium aftermarket complete drive assembly engineered for high-performance marine systems. This complete unit features a standard 1.50 gear ratio configuration combined with dual water inlets (side and low water intakes) to optimize water volume and intake flow, ensuring reduced engine temperatures during high-speed operation. Manufactured for structural integrity in demanding environments, it delivers smooth power delivery and durability for marine engines rated up to 425HP.

Ideal Applications

  • High-Horsepower Stern Drive Maintenance

  • High-Speed Hull Propulsion Replacement

  • Warm Water and Heavy-Load Marine Duty

  • Brand: SEI Marine Products
  • Part Number: Complete2 (Kit components: 90-121-01B / 90-122-02)
  • OEM / Cross-Reference: 5231200TP
  • Engine Compatibility: Bravo One (Standard Models)
  • Physical Specifications: 1.50 Gear Ratio, dual water inlets (side and low water pickup)
  • Maximum Horsepower: 425 HP
  • Drive Type: Complete Stern Drive Unit
  • Water Conditions: Saltwater and Freshwater
  • Fits applications requiring a 1.50 gear ratio
  • Premium aftermarket replacement for Bravo One configurations with dual water inlets
  • Rated structurally for power outputs up to 425HP
  • Verify Gear Ratio: Ensure your engine setup and hull design strictly match the 1.50 ratio specifications before purchasing.
  • Intake Style Verification: This assembly features dual water intakes (side and low water inlets). Verify your cooling configuration matches this intake design.
  • Exclusions: This unit is NOT a replacement for heavy-duty, high-performance X, XR, or XZ model drives.
  • Assembly Notice: Ships as halves in separate boxes; assembly hardware and connection accessories are not included and must be sourced separately.

Mariners Warehouse vs Others

Built to match OEM standards while delivering reliable performance and peace of mind.

Features

Mariners Warehouse

Others

Performance ✔️
Warranty Support Reliable warranty Limited or unclear warranty terms
Customer Trust Trusted by thousands of marine customers Unverified buyer trust
Pre-tested before shipping for reliability ✔️
OEM performance standards ✔️
Simple return process ✔️

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