540 Stern Drive

The Konrad 540 out performs and outlasts the competition. Offered in two models standard and high performance.:

intended for military intercept, police rescue, recreational performance, and high performance racing the konrad 540 offers

  • Oversized bearings
  • Thicker walled casings
  • One piece propeller shaft
  • Continuous oil circulation for cool operation
  • No corrosive exhaust through drive
  • Precision machined super alloy gears
  • No failure-prone cone clutch
  • Minimal maintenance required

analysis form

Every application is analyzed and approved by Konrad Application Engineers.  Please complete the Analysis Form and submit it online, or download the PDF to print, scan, email, or mail back to Konrad.  A Konrad Application Engineer will contact you to discuss your priorities and goals and determine the best Konrad sterndrive model for you.  You can also reach out to us anytime. We look forward to working with you!


For your convenience, we have downloadable documents that will help with the conversion process.

520 Installation Guide

520 Maintenance Manual


Package Options

Standard Equipment (Supplied with Sterndrive)

  • Complete sterndrive assembly
  • Inner and outer transom assembly
  • Trim pump assembly (including trim cylinders)
  • Oil reservoir with low level sensor for use in hull
  • Drive comes full of sterndrive lubricant
  • Two quarts of power trim fluid

Additional Equipment Required (Not supplied but available for purchase from Konrad)

  • Transmission
  • Propeller
  • Steering package
  • Lifting Brackets
  • Drive shafts/transmission tail piece
  • Bellhousing adapter
  • Flywheel coupling
  • Transmission oil cooler
  • Alignment tool

Options for Individual Applications (Available for purchase from Konrad)

  • HD Upper Assemblies
  • Isolator Mounts
  • Installation tool kit
  • Extension kits
  • Tie bars
  • Technical engineering assistance

Material / Manufacturing Specifications

Taper roller bearings, spaced for optimum load carrying capabilities, support the shafts

Manufactured from high strength, heat treated aluminum

High strength heat treated alloy steel utilizing high performance marine technology

Manufactured from high alloy, heat treated steel

Industry leading size for increased load carrying capacity and extended life

Installation / Operational Specifications

Military Intercept, Police Rescue, Recreational Performance, and High Performance Racing

Engine Connection
Direct or Remote (Jack or CV Shaft)

None through the sterndrive

Gear Ratios
1.21:1, 1.33:1, 1.51:1, 1.67:1

Full Immersion, 7 quarts with external reservoir

Diameter Range - Up to 16 in (41 cm)

Operates in either right or left hand rotation

Steering Angle
56° range

Reversing transmission required

Transom Mounting
Template available per application

Transom Requirements
14° angle nominal, 6.4 mm - 76.2 mm (1/4 in - 3 in) thick

Trim/Lift System
Approximate -6° to +10° trim, twin cylinders with electrohydraulic pump
Approximate 30° of total lift range

Water Pickup
None through the sterndrive


All applications and warranties are subject to evaluation and approval by the factory and may be approved with lower annual hours than noted maximum.

500 Series Warranty Manual