The 2007 Yamaha FX160 WaveRunner is powered by the renowned MR-1 engine, a high-performance, four-cylinder, four-stroke marine engine developed by Yamaha. This engine is celebrated for its durability, reliability, and smooth performance, and it marked a significant step forward in Yamaha’s move toward four-stroke technology in personal watercraft.
⚙️ Engine Type and Design
•Engine Name: Yamaha MR-1 (Marine Revolution 1)
•Type: Four-stroke, four-cylinder in-line
•Valve Train: Dual Overhead Camshaft (DOHC), 16 valves (4 valves per cylinder)
•Displacement: 998 cc
•Bore x Stroke: 76 mm x 58 mm
•Compression Ratio: 11.4:1
•Fuel Induction: Naturally aspirated (no turbo or supercharger)
•Maximum RPM: Approximately 10,200 RPM
•Rated Horsepower: Around 110 horsepower at peak RPM
•Mounting: Soft rubber engine mounts to reduce vibration
This engine is based on Yamaha’s high-revving motorcycle engine platform, adapted for marine use by using corrosion-resistant materials and redesigning key systems like cooling and exhaust.
🔧 Associated Systems and Features
💨 Fuel and Air Induction System
•Fuel Delivery: Multi-point Electronic Fuel Injection (EFI), managed by an onboard ECU that adjusts for throttle position, engine temperature, barometric pressure, and intake air temperature.
•Throttle Body: Controlled via cable linkage to the handlebars.
•Intake Manifold: Tuned for low- and mid-range torque, providing responsive acceleration.
🔥 Ignition System
•Type: Digital Capacitor Discharge Ignition (CDI)
•Spark Plugs: Typically NGK CR9EB, designed for marine environments
•Timing: Electronically controlled, advancing or retarding based on engine conditions
❄️ Cooling System
•Type: Open-loop water cooling system (uses external water)
•Flow: Water is drawn through intake ports by the jet pump and routed through the engine jackets to regulate temperature.
•Corrosion Protection: Engine components are anodized or treated to resist saltwater corrosion. Regular flushing is recommended after use in saltwater
