The increased displacement improves low speed torque as well as the performance through the whole rpm range.
High-Comp spec with the compression ratio 0.7 higher than std (12.5:1)
Defric coating (Lubricous film) is applied to the piston skirt, for a reduction in friction and loads as well as improved durability.

Bore×Stroke ø89.20×90mm
Displacement 2250cc
Crown Volume 1.07cc/-1.43cc
Projection Height -0.5mm
Reference C/R  TODA head GK t=0.6mm ξ≈13.2:1