Pulse Adrenaline / Superbyke RMR125 K157FMI 57mm Cylinder Kit
Brand-new unbranded standard 57 mm top-end kit for selected Pulse Adrenaline 125 and Superbyke RMR125 motorcycles using the K157FMI engine family.
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 |
|---|---|---|---|
| Pulse | Adrenaline 125 XF125GY-2B | K157FMI application | Match original 57 mm EGR-style cylinder |
| Superbyke | RMR125 | K157FMI application | Match original 57 mm EGR-style cylinder |
Important Fitment Information
Use the engine code and physical cylinder configuration as the primary fitment check. Modified engines or replacement engines may use different top-end parts.
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.