Four Stroke Series - High Thrust Features & Benefits Measuring 14"x11", the large diameter low pitch design of the optional Dual Thrust propeller makes it ideal for pontoon applications. (For T60) Our unique dual thrust propeller provides up to 60% more thrust in reverse and up to 70% more in forward than a comparable two stroke. Multi-Function Tiller Handle, optional on T25 through F115, gives you fingertip control of starting, shifting, steering and throttle. All Yamaha Four Strokes exceed Federal EPA 2006 emission requirements. The T60 High Thrust model has earned a California C.A.R.B. three-star rating for ultra-low emissions. Our Three Year Limited Warranty protects every Four Stroke. Higher Gear Ratio on High Thrusts delivers more power when you need it, minimizing slippage and cavitation. Award Winning Innovation is yours in every Yamaha Four Stroke outboard. TCI or CDI Microcomputer Ignition adjusts timing to maintain optimum engine performance, economy and durability in all conditions. Four Stroke Fuel Economy is yours with the smooth, quiet, fuel efficient High Thrust and Jet Drive four strokes. Yamaha is Dedicated to Helping create a cleaner environment through advances in outboard technology. Thermostatic Cooling Control ensures proper engine temperature at all times for consistent performance and long trouble-free engine life. Crossfire Valve Fuel Charging maximizes combustion for smooth running and provides outstanding low-throttle characteristics for trolling. Yamaha High Thrust Four Strokes deliver up to twice the thrust of comparable two-strokes