Keeway TX125 / TX Supermoto 57mm Cylinder Kit – 157FMI
Brand-new unbranded standard 57 mm cylinder and piston kit for compatible Keeway TX125 Enduro and TX125 Supermoto motorcycles.
Key Specifications
- Standard bore: 57 mm
- Engine family: K157FMI / 157FMI GS-style
- Stroke reference: 48.8 mm where documented
- Piston-pin reference: 14 mm
- Air-cooled single-cylinder 4-stroke application
- EGR / secondary-air-system style cylinder family
- 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 Compatibility
| Model | Years / Variant | Notes |
|---|---|---|
| TX 125 Enduro / TX 125 Supermoto | 2009–2017 | Official TX manual: 157FMI-2B, 57 x 48.8 mm; OEM cylinder 139013210030 |
| TX 125 EFI Enduro / Supermoto | 2018–2020 | 57 mm / 14 mm piston family; compare cylinder revision and emissions ports |
Important Fitment Information
The Keeway TX125 manual specifies a 157FMI-2B engine with 57 x 48.8 mm bore/stroke. Confirm 14 mm piston pin, EGR/secondary-air fittings and the original cylinder/gasket layout before ordering.
Do not order by 125cc capacity alone. Compare bore, piston-pin diameter, piston crown, cylinder height, stud spacing, gasket profile, oil passages and EGR/secondary-air ports with the original top end.
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.