Abstract: An enclosed pressure washer system includes an engine having a horizontal output shaft, an exhaust system having a muffler and an exhaust outlet port in the muffler, a fan rotatably coupled to the horizontal output shaft, a starting system structured to start the engine, and a pump rotatably coupled to the engine via a non-metallic connector. The starting system includes a flywheel, a battery, and a starting device structured to start the engine. The pump includes an inlet which water enters from an inlet conduit and an outlet which pressurized water exits to an outlet conduit. The pressure washer system further includes an enclosure structured to house the engine, muffler, and pump and a sound absorbing case which surrounds the engine, pump, and the muffler and allows the exit of exhaust gas. The pump, flywheel, and fan are positioned on a side of the engine proximate the horizontal output shaft.