In the context of motorcycle engines, "boring" and "new engine" refer to two different concepts:
Boring: Boring refers to the process of enlarging the cylinder bore (the inner diameter of the cylinder) in an engine. This is typically done to increase the engine's displacement, which can result in improved performance. Boring involves removing material from the cylinder walls, making them wider and allowing for larger pistons to be installed. By increasing the cylinder volume, the engine can draw in more air-fuel mixture and generate more power. Boring is often performed as part of an engine rebuild or performance modification.
New Engine: A new engine, on the other hand, refers to a completely fresh and unused engine. It is a brand new unit that has not been previously used or installed in a motorcycle. A new engine is typically obtained when the original engine becomes damaged, worn out, or when a motorcycle is being built from scratch. It comes directly from the manufacturer or an authorized dealer, and it is ready for installation.
To summarize, boring is a process of modifying an existing engine by enlarging the cylinder bore, while a new engine is a completely new and unused engine unit. Boring aims to increase engine displacement and performance, whereas a new engine is a replacement for a worn-out or damaged unit.