Mercury Manual-Owners - 90-86117J90. The Mercury Manual-Owners - 90-86117J90 is the official owner's guide designed to help you get the most out of your Mercury engine. Packed with factory-verified information, this OEM manual walks you through essential procedures for operation, maintenance, and safety-ensuring your time on the water is both efficient and worry-free.. Key Features. Authentic OEM Manual - Published by Mercury Marine for model-specific accuracy. Covers Daily Use & Maintenance - S