Yamaha Motor Australia has announced two newly upgraded designs for its F115 and F200 four-stroke outboard engines.
The new F115 is both lighter and more efficient that its predecessor. Based on the DOHC in-line, four-cylinder 16-valve engine, the updated F115 features a new, long-track intake system with a single throttle valve and a resonator to improve throttle response. Its combustion chambers have also been reshaped and combined with the electronic fuel injection system to achieve more precise control of the combustion process for improved performance and fuel efficiency. A new knock sensor in the ECM has also been added to provide protection from poor fuel as well as improved combustion efficiency. The F115 incorporates the latest ancillary designs and new materials that help the outboard achieve a lighter weight, which also ultimately translates to even greater efficiency.
The new F200C utilises engine construction and technology that was first introduced on Yamaha's F250A. The F200C takes advantage of variable camshaft timing (VCT) to increase low- and mid-range torque without compromising on maximum output and top-end performance. VCT advances and retards the camshaft timing according to the engines RPM in order to increase the intake and exhaust efficiency at low and mid range RPM to obtain better power and acceleration.
The F200C also features a single throttle valve that is controlled electronically by the engines ECM. This enables precise control over the intake of air, which is smoothly routed into each combustion chamber through the surge tanks and the long intake manifold for greater power. Long intake manifolds are designed to increase air flow and work in harmony with the F200C's variable camshaft timing to boost low and mid-range torque and achieve quicker acceleration.
Both the F115A and F200C are rated as a three star ultra low emission engines.
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