Sinnis Blade 125 2007-2016 K157FMI 150cc Big-Bore Cylinder & Piston Kit
Brand new aftermarket big-bore top-end upgrade kit for Sinnis Blade 125 QM125GY-2B, 2007-2016. This is the Chinese Suzuki-style K157FMI / 157FMI cylinder family commonly sold as a 150cc upgrade for compatible 125cc air-cooled four-stroke engines.
The kit shown includes an aluminium finned cylinder barrel with cast-iron liner, flat-top piston, piston rings, 14 mm gudgeon / wrist pin, circlips and the top-end gaskets and seals pictured.
Direct Fitment
- Sinnis Blade 125 QM125GY-2B, 2007-2016
- Engine family: K157FMI / compatible Suzuki-GS-style 157FMI
Kit Contents
- 1 x big-bore cylinder barrel
- 1 x flat-top piston
- 1 x piston ring set
- 1 x 14 mm gudgeon / wrist pin
- 2 x piston-pin circlips
- Top-end gaskets and seals as pictured
Technical Specification
- Marketed displacement: 150cc big-bore upgrade
- Piston size: approximately 61 mm
- Piston type: Flat top
- Gudgeon / piston pin: 14 mm
- Engine type: Single-cylinder 4-stroke
- Cooling: Air cooled
- Valve train family: OHC / cam-chain K157FMI
- Material: Aluminium finned cylinder with iron liner
- Shopify product weight: 2.0 kg
- SKU: 01243-ENG
Common Aftermarket Cross References
- K157*150
- K157 150KT
- EP018995 - K157FMI 150cc power-up big-bore set
- EP018995EGR - K157FMI non-EGR variant reference
- EP010014EN150 - replacement piston & ring family for K157 150cc big-bore kits
Important EGR / SLS & Engine Check
K157FMI big-bore cylinders are sold in more than one side-port configuration. Some engines use an EGR / secondary-air (SLS) passage and others use a non-EGR cylinder. For a direct fit, the cylinder supplied must have the same side-port arrangement as the original engine.
Before ordering, check the engine marking and compare the original cylinder with the product photographs. The engine should use a 14 mm piston pin, flat-top piston, matching cylinder-stud pattern, crankcase spigot and identical EGR/SLS port arrangement. Do not order solely because the motorcycle is 125cc.
Installation & Setup
This kit is designed as a bolt-on top-end conversion for the matching K157FMI engine family and does not require the original cylinder to be rebored. During installation, check piston-to-valve clearance, ring end gaps, cam timing, valve clearances, gasket surfaces and oil supply.
A larger-capacity top end can require carburettor jetting or EFI fuelling adjustment to achieve the correct air-fuel ratio. Engine-capacity changes may also affect road-registration, licence or insurance requirements.
Search Terms
K157FMI 150cc big bore kit, K157FMI cylinder piston kit, 61mm piston, 14mm gudgeon pin, Chinese Suzuki 125 big bore, 157FMI cylinder kit, 125 to 150cc conversion, motorcycle top end rebuild, K157 150KT, EP018995.
Condition: Brand new aftermarket replacement / performance part. Cross-reference numbers are supplied for identification only.