cylinder kit fits ET4 150, LX150, and other scooters with the Leader 125-150cc engine. TECHNICAL FEATURES: Cylinder – Material: ry aluminium alloy with a high content of hardened and tempered silicon, cylinder liner with silicon carbide coating in a galvanic nickel die and crossed smoothing with two diamond passages with very limited tolerances. – Machining: on machine tools with high precision numerical control. – Cylinder-piston connection with an allowance of 0.05 mm. – Recalculated and upgraded heat exchange surfaces. Piston – Ultra compact with 3 rings. – Material: special aluminium alloy with high silicon content, low thermal expansion and a tin facing on the sliding surfaces. – Machining on machine tools with numerical control. – Lightened and reinforced. – Upgraded heat exchange surfaces. Piston rings – Special rings with high sliding ease and very high mechanical resistance. – I?? ring compression in nitrided and chromium steel. – II?? special cast iron ring. – Three-piece scraper ring made of chromium-plated special steel Replacement pistons are available here. Replacement rings are available here.