... days' warranty !! Bottom price from the fact Bicycle engine kit , single cylinder air cooling 2 stroke , Gen4 ... New cylinder with bigger intake air hole , takes engine more power.***1.25mm enlarger size for the ... Gen3 ISO carburator, bigger slide and jet , take engine more power.***Spring idle pulley , give comfortable to ... .init( { 'aImgSrc': aBigImageSrc } ); } )(); Moped 2013 Latest Engine Kit 43cc