ALUMIN-CYL.Ø77 H2O SCOOTER 250 4-stroke code = 31 9922 HONDA HONDA FORESIGHT 250 4t LC [FES] HONDA JAZZ-FORZA-REFLEX 250 4t LC [NSS] PEUGEOT PEUGEOT SV 250 4t LC PIAGGIO PIAGGIO X9 250 4t LC (HONDA ) download assembly instructions ( 289 KB ) COMPLETE CYLINDER 4-STROKE TECHNICAL FEATURES Cylinder - Material: primary 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