This upgrade refers to a modification for certain motorcycle engines that increases their displacement to approximately 88 cubic inches. This is achieved through the use of larger diameter pistons and, sometimes, modifications to the cylinder itself. For example, an engine originally designed with a smaller bore and stroke can be altered to achieve the greater displacement and, consequently, enhanced performance.
Implementing this upgrade can result in a significant improvement in engine power and torque. The increased displacement allows for a greater volume of air and fuel to be combusted, leading to more forceful explosions and a corresponding increase in output. Historically, this type of modification has been popular among motorcycle enthusiasts seeking to improve the performance characteristics of their machines, often to achieve better acceleration, towing capability, or overall riding experience.