Mash Seventy Five 125 2015–2019 K157FMI 57mm Cylinder Kit
Brand-new unbranded standard-bore 57 mm top-end kit for compatible Mash Seventy / Seventy Five 125 motorcycles using the K157FMI-style engine.
Key Specifications
- Engine family: K157FMI / 157FMI GS-style
- Displacement: Standard 125cc application
- Standard bore: 57 mm
- Engine stroke reference: 48.8 mm
- Piston-pin reference: 14 mm
- Cooling: Air-cooled
- Engine type: Single-cylinder 4-stroke
- Cylinder style: EGR / secondary-air-system type
- Condition: Brand new
- Type: Unbranded aftermarket replacement
What's Included
- 1 x cylinder barrel
- 1 x piston
- 1 x piston ring set
- Head and base gaskets
Vehicle / Engine Compatibility
| Make | Model / Engine | Years / Scope | Notes |
|---|---|---|---|
| Mash | Seventy / Seventy Five 125 | 2015–2019 documented aftermarket application | 57 mm bore, 48.8 mm stroke, 14 mm pin reference |
Important Fitment Information
The documented application uses a standard 57 mm bore and 14 mm piston-pin reference. Compare cylinder height, piston profile, EGR/SLS ports and gaskets with the existing engine.
Do not order by 125cc capacity alone. Before purchase, compare the original engine code, 57 mm bore, piston-pin diameter, piston crown/profile, cylinder height, stud spacing, gasket profile, oil passages and EGR/secondary-air ports with the existing engine.
The K157FMI family was used across carburetted and fuel-injected motorcycles, and production changes can affect top-end components. This kit should only be used where the original parts match the standard 57 mm K157FMI EGR-style configuration.
Installation
Correct piston-ring orientation, piston direction, valve timing, gasket installation and cylinder-head torque are essential. Professional installation is recommended where the correct engine-building procedure is not known.