A flat-four engine has four cylinders arranged in an reverse direction alongside a common crankshaft. The pistons move faraway from each other at the same time. Illustrations are Honda CB750 and BMW K1200RS. The overhead valve is applied, which considerably enhances gas cost savings. The air filter also improves air https://charlieytkas.blogofoto.com/66229680/bob-mills-lift-chairs-an-overview