Remanufactured outboard powerhead (FourStroke EFI technology).. Fits:. L-4 cylinder 150 hp. FourStroke EFI outboards. Serial number 1B905505 and above.. Quicksilver offers a wide variety of 2-Stroke and 4-Stroke remanufactured powerheads for Mercury and Mariner applications between 75-300 HP. All powerheads are completely disassembled, precision machined, honed, cleaned and assembled by a team of factory technicians. Remanufactured to fully jeweled precision with 100% OEM components using the latest engineering revisions, these products are the only logical choice for a remanufactured powerhead. Quicksilver's remanufactured powerheads come with a 1-year factory limited warranty.. This product may require a core/container deposit.