material: alu. 4 strokes bore size: 56.5 Other models: DIO50（bore:39mm）, DJ50(bore:39mm), C50(bore:39mm), MTB-200(bore:39mm), X8-R(bore:39mm), CL50(bore:39mm), SFX50(bore:39mm), kymco50(bore:39mm), GM9(bore:40mm), L50SS(bore:40mm), L50(bore:40mm) LEAD50(bore:40mm), NZ50(bore:40mm), BT50(bore:41mm), T5R50(bore:41mm), CL60(bore:43mm), CB125-T(bore:44mm), kymco60(bore:44mm), GBO(bore:47mm), GBI(bore:47mm), JH70(alu.) (bore:47mm), LJ90(bore:47mm), CF90(bore:47mm), JH90(bore:47mm), C70(bore:47mm),[...]