BS0218 - W/S 72CC Stamped But 49CC Cylinder Steel 6V 47MM Piston

English Product Description
Product Name: W STANDARD Cylinder & Piston Kit (Marked 49cc Barrel, Actual Displacement 72cc)
Product Overview
This complete kit consists of air-cooled motorcycle engine cylinder barrel and piston assembly. The cylinder barrel is marked as 49cc specification, while the overbore design delivers an actual displacement of 72cc. It is suitable for modification and upgrade of multiple horizontal small engines.
The full set includes cylinder barrel, piston, piston rings, piston pin and circlips, ready for direct installation.
Specifications
Cylinder Barrel Mount Dimensions
Top flange overall length: 48.5 mm
Flange width: 50.5 mm
Bottom mounting width: 46.5 mm; inner flange distance: 52.5 mm, center distance: 47 mm
Total height of cylinder cooling body: 88.5 mm; fin height: 62.6 mm
Piston Parameters
Overall piston height: 47.8 mm
Piston skirt height: 47 mm
Distance from top ring groove to piston crown: 24.2 mm; ring groove section length: 20.1 mm
Compression ring grooves: 2 pcs, groove width 1.2 mm
Oil ring groove: 1 pc, groove width 2.5 mm
Piston Pin & Circlips
Piston pin: Ø13 mm, length 38 mm
Circlip: outer diameter 14.9 mm, thickness 1.0 mm
Features
✅ Integrated cooling cylinder with reinforced cooling fins, stable heat dissipation under air-cooled operation
✅ High-precision piston matched with standard piston rings for excellent air tightness
✅ Complete accessory set, no extra separate parts required
✅ Upgrade from stock 49cc engine to 72cc displacement directly, noticeable power boost. Ideal modification part for mini motorcycles & pit bikes.