🏷️ Basic Information Identification Make: Yamaha Model: 4MHQ Type: Outboard Engine 📋 Manual Details General Manual Type: Replacement Parts Manual Language: English Format: PDF Access Downloadable: Yes, Instant Compatibility: All PC & MAC Computers Requirements Software Requirement: Adobe PDF Reader ⚙️ Engine Specifications General Engine Type: 2-stroke Power Horsepower: 4 Displacement Cubic Centimeters: 87 Cooling Cooling System: Water-cooled Ignition Ignition System: CDI Fuel Fuel Type: Unleaded Gasoline Fuel Mixture Ratio: 50:1 (Gasoline:Oil) Lubrication Oil Type: 2-stroke Outboard Oil 🔧 Transmission General Type: Forward, Neutral, Reverse Propulsion Drive System: Direct Drive 📐 Dimensions Shaft Shaft Length Options: Short, Long (Typically) Weight Dry Weight Kg: Approximately 20-25 🔧 Maintenance Scheduled Maintenance Spark Plug Replacement Interval Hours: As per manual recommendations (typically 100-200) Gear Oil Change Interval Hours: Annually or every 100 hours, whichever comes first Lubrication Gear Oil Type: Yamaha Marine Gear Oil (or equivalent) 📄 Features Starting Starting System: Manual (Recoil Starter) Steering Steering Mechanism: Tiller Handle with Twist Grip Throttle