This manual covers the Mercury Mariner 65 HP Jet, a robust 2-stroke, Inline-3 engine with a displacement of approximately 1065 cc. Engineered for reliable performance, this water-cooled unit features a CDI ignition system and carburetor fuel induction, delivering a powerful 65 HP output. Its jet drive transmission offers versatile maneuverability with Forward, Neutral, and Reverse gears, making it suitable for various watercraft applications. The engine's design emphasizes durability and efficient operation within its recommended 4500-5500 RPM range. This comprehensive Service Repair Manual provides essential information for the maintenance and repair of your Mercury Mariner 65 HP Jet. It details critical procedures, including proper fuel-oil mixture ratios (50:1 with TCM-spec oil), gearcase lubrication requirements (using Mercury High Performance Gear Lube), and recommended spark plug types (Champion QL77CC or equivalent). The manual also outlines recommended annual maintenance and seasonal storage procedures, ensuring the longevity and optimal performance of your engine. This guide is an indispensable resource for owners and technicians alike.