[MOS] High Performance 155cc Big Bore Cylinder Kit 2014 2015 2016 2017 Zuma BWS 125cc series

FOB Reference Price:Get Latest Price
US $40-67 / Set | 1 Set/Sets (Min. Order)
Supply Ability:
100 Set/Sets per Month
Keelung, Taiwan
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Quick Details
Place of Origin:
Brand Name:
Model Number:
Size (Bore):
155cc (155.62cc)
Cast Iron
Made in:
Packaging & Delivery
Packaging Details
1 set in Wooden Box
several wooden box in a master carton
Delivery Time
Shipped in 7 days after payment

[MOS] High Performance 155cc Big Bore Cylinder Kit 2015 2016 2017 Zuma BWS 125cc


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


Note: 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: 57.9mm
  • MOS High Performance Big Bore Cylinder (155cc)
    • [(3.1416 x 58.5²) ÷ 4,000] x 57.9 = 155.62 (155cc)
      • π: 3.1416
      • D: 58.5mm
      • L: 57.9mm
  • 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)

We also have other motorcycle parts, please feel free to contact us for further information. 






Company Information


[About MOS]

 We are a PRO for exporting motorcycle spare parts. Offer genuine, aftermarket and MOS brand parts. 
 Our MOS from Taiwan and our company specializes in Design and Development for Motorcycle customized parts and accessories.

  MOS Feature:

 Customized Parts and Accessories

 Top Quality Carbon Fiber Parts

 CNC Parts Supplier & Manufacturer

 Plastic Injection Molding

 Custom Motorcycle Lights

 Quick response & ardently service


All MOS products are Made in Taiwan with excellent quality.

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