2011 YAMAHA EF2800i, The EF2800i weighs just 68 pounds, making it the lightest generator in its class. With the EF2800i, Yamaha has created one of the quietest generators in its class (64-67 dBA). Inverter system with Pulse Width Modulation (PWM) control Can power computers, or computer-controlled electric tools or dev. Smart Throttle Improves fuel economy and reduces noise. Oil Watch Warning System Prevents engine damage, avoiding costly repairs and minimizing down time. stop by and i'll get you ready to work.