High performance is now more accessible...
This is a low-cost bore-up kit that allows you to use your stock cylinder head as is. It increases torque and power in the low and mid-speed ranges, allowing you to experience for yourself what a bore-up is really like.
 
Steel cylinder
, displacement: 75cc,
　bore diameter: φ48
　, stroke: 41.4mm (standard)
, piston: cast