Which engines benefit from plasma fused cylinders?

Plasma fused cylinders are a significant advancement in engine technology, providing enhanced wear resistance and improved overall performance. In the context of the Yamaha engines, the 5.6L XTO and all 4.2L engines utilize this technology, making them particularly robust and efficient.

The 5.6L XTO engine is designed for high-performance applications and, with plasma fused cylinders, it benefits from reduced friction and improved durability, which are essential in marine settings where reliability is critical. The plasma fusion process allows for a hard surface that can withstand the harsh conditions typically faced in marine environments.

All 4.2L engines also incorporate this technology, reflecting Yamaha's commitment to delivering quality and performance across its engine lineup. This choice of construction enhances their longevity and efficiency, contributing to better fuel economy and power output.

The other options specify engines not associated with plasma fused cylinder technology or limit its application to a smaller subset that does not include the major contributors to Yamaha's innovations in this area. Thus, option B accurately encompasses both the 5.6L XTO and the complete range of 4.2L engines that utilize this advanced cylinder design.