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High Performance 155cc Big Bore Cylinder Kit 2015 2016 2017 Zuma BWS Cygnus 125cc
Item No : Y-CY-585-XG125

  • Transform your Yamaha scooter engine capacity from 125cc to 155cc
  • Works on:
    • Yamaha 125cc:
      • BW’S, BWS, BWS R, BWS X, BWS FI, Cygnus X, Cygnus FI, Cygnus SR, GTR, Aero, Zuma, YW125, YW 125 BEE WEE
    •  MBK 125cc:
      • X Over, Flame X, Flame FI, Flame SR
  •  Notes:
    • Genuine cylinder diameter (bore) in the scooter must be 52.4mm with a piston stroke of 57.9mm
    •  If the genuine cylinder diameter and piston stroke are different, this High Performance Cylinder set will not fit the engine.
    •  Any doubt, please contact us for more details.
  • Made in Taiwan
  • Formula to calculate the unit cylinder size:
    • [(π x D²) / 4,000] x L
      • π: 3.1416
      • D: Cylinder diameter (mm)
      • L: Piston stroke (mm) (given by the camshaft)
    • Genuine Cylinder (125cc)
      • [(3.1416 x 52.4²) ÷ 4,000] x 57.9 = 124.86 (125cc)
      • π: 3.1416
      • D: 52.4mm
      • L: 57.4mm
    • MOS High Performance Cylinder (155cc)
      • [(3.1416 x 58.5²) ÷ 4,000] x 57.4 = 154.28 (155cc)
      • π: 3.1416
      • D: 58.5mm
      • L: 57.4mm
  • Content:
    • Cylinder block (Height 72.80mm & OD 61.20mm) (x1)
    • Piston (x1)
    • Piston rings (Riken) (x5)
    • Piston pin (Height 41.85mm & OD 15mm) (x1)
    • C Pin rings (x2)
    • Gaskets (x3)
    • Wooden box (x1)