That set up indicates considerably less mass during the cylinder head and reduced excess weight for the overall outboard. Simultaneously, four valves for each cylinder suggests terrific motor combustion, which contributes to horsepower, torque and fuel effectiveness. Quick Acceleration A TCI microcomputer ignition adjusts timing to maintain optimal engine efficiency, https://yamaha4strokeoutboardmoto20753.tinyblogging.com/yamaha-25hp-outboard-for-sale-things-to-know-before-you-buy-79245144