In order to realize high compression, high efficiency combustion, and low friction of the piston, the piston is a piston that pursues the optimum piston shape with a focus on details. 
High rigidity aluminum forging material is adopted to withstand high compression ratio. 
Bore diameter 52.4 mm (same bore diameter as normal) 
compression ratio High-compact piston 12.5: 1 (normal piston 9.8: 1)
 
■ Notes
Be sure to install our sports camshaft and FI Con 2 (injection controller) at the same time. 
It becomes high octane gasoline specification.