V MAX 3.1 L OX66 - Features & Benefits Yamaha's "SMART" Microcomputer Technology continually adjusts ignition timing by using no less than eight sophisticated sensors to monitor vital engine functions and operating conditions. Six Independent Throttle Intake Valves and Fuel Injectors fine-tune performance and fuel efficiency on a per-cylinder basis, providing better low-end performance and smooth acceleration. The External Trim/Tilt Switch enables you to tilt the motor from outside the boat. Our unique Air Silencer routes intake noise through a maze of sound-dampening reflectors. So your V MAX® is almost as quiet as it is quick. The Offset Crankshaft minimizes vibration for smooth running at any speed. A Two-Stage Vapor Separator tank keeps fuel cool and saves battery power. V MAX® Enhanced Motor Mounts are 22% stronger for greater stabilization at high speeds. Optional Pro Series Prop has a high rake and Torque Control Hub, adding even more acceleration and top speed. Multi-Charge Monitoring keeps both batteries charging whenever the engine is running.