SEI has engineered replacement lower units for Mercury, Yamaha and Johnson Evinrude. The lower units offered by SEI are fully compatible and interchangeable with Mercury, Yamaha and Johnson Evinrude lower units.
SEI is currently producing lower units for V6 outboards. SEI’s lower units replace most V6 outboards from 1980 to present.
Often SEI is asked about the quality of our lower units and how the company is able to offer such a product at a fraction of the OEM price. SEI's Lower units are assembled at our factory in Clearwater, Florida. The parts come directly from suppliers around the world made to SEI's exact and precise specifications. Eliminating the middleman reduces SEI's costs and these savings are passed on to the customer. SEI also avoids using distributors thus reduces the company's costs at getting the product into the hands of the boat owner. As for quality, SEI's Lower units are thoroughly tested for both performance and endurance. SEI operates one of the world's only research lakes dedicated to the testing of marine propulsion systems.
SEI's Lower units come with a three-year, fault-free warranty which means that the lower unit will be covered for any failure that requires the lower unit to be replaced or repaired. This is truly a remarkable warranty. Hit a rock, suck up some fishing line, drag the lower unit up the boat launch by mistake, it does not matter, the lower unit will be covered by SEI's fault-free warranty.
SEI has been in the stern drive business since 2003. The company was founded by Greg Pickren. Mr. Pickren also is the owner and founder of the company Short Block Technologies (SBT) which is the largest supplier of Personal Water Craft engines in the world. Justin Webb is the General Manager of SEI and was previously employed by Konrad Marine and GLM.
SEI is also working on producing lower units for smaller 3 and 4 cylinder Mercury, Yamaha and Johnson Evinrude Outboards.
The three year fault-free warranty covers any damage to the drive that requires it to be repaired or replaced including failures resulting from lack of oil, fishing line, impact, neglect, and other abuse. Sterndrive Engineering, Inc. (SEI) manufactures a stern drive designed to replace Mercury Marine's MerCruiser®, Alpha One®, R, MR, Gen II and Bravo One® stern drives. MerCruiser®, Alpha One®, Gen II, R, MR and Bravo One® are trademarks of the Brunswick Corporation. SEI has no affiliation with the Brunswick Corporation. Consequently, any warranties governing products manufactured and/or sold by Brunswick Corporation will not apply to products manufactured and/or sold by SEI, or to products damaged due to the operation of an SEI product. Sterndrive Engineering, Inc. is not affiliated with Mercury®; Yamaha®; OMC® or their products. All reference to their trademarks and trade names are the property of the respective owners.