Yamaha Xmax 300 Cylinder Block STD (B74-E1351-00)

The Yamaha XMAX 300 Cylinder Block STD (B74‑E1351‑00) is the primary engine cylinder housing in standard (STD) bore size, designed to accommodate the piston and provide the combustion chamber for the XMAX 300’s power unit. Precision‑machined to exact OEM specifications, the cylinder block ensures optimal alignment of the piston, rings, and connecting rod throughout the engine’s operating range.

Made from high‑strength alloy with a heat‑resistant finish, this cylinder block offers durability and consistent thermal performance under repeated combustion cycles. The standard bore size means it matches the original dimensions, making it ideal for repairs, overhauls, or rebuilds where the engine has worn but remains within serviceable tolerances. A proper cylinder block maintains correct compression, efficient combustion, and balanced piston travel — all essential for smooth power delivery, fuel efficiency, and engine life.

Over time, cylinder walls can wear, score, or suffer surface damage from heat, contaminants, or lubrication issues. Installing this genuine‑style cylinder block restores proper internal clearances, reduces blow‑by and oil consumption, and helps maintain peak engine performance. Ensuring accurate fitment and correct torqueing practices during installation helps preserve long‑term reliability and smooth operation.